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  • A review of titanium dioxide and its highlighted application in molecular imprinting technology in environment
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Cui Lai, Xiangxiang Zhou, Danlian Huang, Guangming Zeng, Min Cheng, Lei Qin, Huan Yi, Chen Zhang, Piao Xu, Chengyun Zhou, RongZhong Wang, Chao Huang
    更新日期:2018-06-19
  • Facile construction of Fe@ zeolite imidazolate Framework-67 to selectively remove uranyl ions from aqueous solution
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Xiaomei Zhang, Ying Liu, Yan Jiao, Qianhong Gao, Xuewu Yan, Yi Yang
    更新日期:2018-06-19
  • Surface plasmon enhanced ethylene glycol electrooxidation based on hollow platinum-silver nanodendrites structures
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Hui Xu, Pingping Song, Carlos Fernandez, Jin Wang, Yukihide Shiraishi, Caiqin Wang, Yukou Du
    更新日期:2018-06-19
  • 更新日期:2018-06-19
  • Preparation of PSf-g-BN15C5/NWF composite membrane with sponge-like pore structure for lithium isotopes adsorptive separation
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Yaolong Liu, Feng Yan, Hongchang Pei, Jianxin Li, Zhenyu Cui, Benqiao He, Lingyun Wang
    更新日期:2018-06-19
  • Hybrid baculovirus-mediated prolonged hemagglutinin expression and secretion in vivo enhances the vaccine efficacy
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Chia-Wei Lin, Ming-Chu Cheng, Shih-Yeh Lin, Shi-Hsiao Hung, Shun-Yu Jhang, Chin-Wei Chang, Poa-Chun Chang, Yu-Chen Hu
    更新日期:2018-06-19
  • Microwave-assisted synthesis of TiO2/WS2 heterojunctions with enhanced photocatalytic activity
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Er-Chieh Cho, Cai-Wan Chang-Jian, Jia-Huei Zheng, Jen-Hsien Huang, Kuen-Chan Lee, Bo-Cheng Ho, Yu-Sheng Hsiao
    更新日期:2018-06-19
  • Azolla-derived hierarchical nanoporous carbons: From environmental concerns to industrial opportunities
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Hosein Banna Motejadded Emrooz, Mahdi Maleki, Alireza Rahmani
    更新日期:2018-06-19
  • 更新日期:2018-06-19
  • 更新日期:2018-06-19
  • Preparation of magnetically recoverable mesoporous silica nanocomposites for effective adsorption of urea in simulated serum
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Ruey-Shin Juang, Chu-Chun Chien, Chao-Ling Yao, Ssu-Han Yu, An-Cheng Sun
    更新日期:2018-06-19
  • Investigation of uranium (VI) adsorption by poly(dopamine) functionalized waste paper derived carbon
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-19
    Jiahui Zhu, Qi Liu, Jingyuan Liu, Rongrong Chen, Hongsen Zhang, Milin Zhang, Peili Liu, Rumin Li, Jun Wang
    更新日期:2018-06-19
  • Effects of water culture medium, cultivation systems and growth modes for microalgae cultivation: A review
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-15
    Kit Wayne Chew, Shir Reen Chia, Pau Loke Show, Yee Jiun Yap, Tau Chuan Ling, Jo-Shu Chang
    更新日期:2018-06-16
  • Biofouling mechanism of polysaccharide–protein–humic acid mixtures on polyvinylidene fluoride microfiltration membranes
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-08-30
    Su-En Wu, Nien-Jung Lin, Che-Yu Chou, Che-Chia Hu, Kuo-Lun Tung

    The biofouling mechanism of organic mixtures on porous polyvinylidene fluoride membranes was tested to determine how to examine the fouling potential of a membrane for water treatments with more representative feed compositions including protein, polysaccharides, and natural organic matters. The three-dimensional structure and compositions of the fouling layers were examined using confocal laser scanning microscopy and the filtration resistances of the fouled membranes were estimated. The filtration resistance analyses demonstrated that feeds with a single-component foulant will cause serious clogging in the pores and form a looser fouling layer structure on the membrane; however, a mixed composition resulted in less clogging in the pore and a denser layer structure on the membrane because of over-deposition and interactions among the foulants. The fouling potential of a membrane examined with a single-component will result in an under-estimation of the filtration resistance of the fouling layer and an over-estimation of irreversible fouling.

    更新日期:2018-06-15
  • Diffusion phenomena of propane and propylene in colloidal zeolitic imidazolate Framework-8 particles
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-10-10
    Shuji Ohsaki, Yuki Morimoto, Satoshi Watanabe, Hideki Tanaka, Minoru T. Miyahara

    Zeolitic imidazolate framework-8 (ZIF-8) enables a kinetic separation of propane and propylene with high efficiency, although the detailed mechanism has not yet been clarified. In the present study, we measure the adsorption rates of propane and propylene in ZIF-8 particles and in-situ X-ray diffraction patterns of ZIF-8 during the gas adsorption process to investigate the effect of the gas pressure and the flexibility of ZIF-8 framework on the diffusion process of propane and propylene in ZIF-8 particles. The adsorption rates of propane and propylene depend on the gas pressure, which would be due to the enlargement of the pore window diameter of the ZIF-8 framework during the gas adsorption as suggested by in-situ XRD measurements. This result is also supported by the calculation of interaction potential profiles between a gas molecule and the ZIF-8 framework, in which an energy barrier at the pore window limits the gas diffusion and the height of the barrier decreases with the increase in the pore window diameter. Furthermore, we find that the adsorption rates of propane and propylene depend on the particle size of ZIF-8, and the selectivity of propylene over propane increases with the particle size.

    更新日期:2018-06-15
  • Filtration behaviors of suspension of dual-sized submicron particles through semi-permeable microfiltration membrane
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-10-23
    Eiji Iritani, Nobuyuki Katagiri, Yuuki Yamaoka

    Particulate filtration behaviors such as the flux decline and particle retention by the membrane during the course of filtration were examined for dead-end constant pressure microfiltration of dilute suspension of dual-sized submicron polystyrene latex (PSL) particles through a semi-permeable membrane with a pore size larger than both particle sizes. The variation of rejection of both larger and smaller particles with the progress of filtration was approximated by the logistic equation. Our analysis was based on the cake filtration model accompanied by partial permeation of particles through the membrane. The model enabled us to evaluate the variation of the reciprocal filtration rate with the filtrate volume per unit effective membrane area, the relation between the filtrate volume and the filtration time, and the characteristic filtration curve frequently employed in the analysis of the blocking filtration law, on the basis of the data of temporal variation of particle retention. It was found that the retention of smaller particles was particularly promoted by the increase in the relative concentration of larger to smaller particles. It was also found that lower applied filtration pressure promoted the retention of both larger and smaller particles, resulting in the profound flux decline.

    更新日期:2018-06-15
  • Distillate flux enhancement of the concentric circular direct contact membrane distillation module with spiral wired flow channel
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-11-01
    Chii-Dong Ho, Luke Chen, Feng-Chi Tsai, Guan-Hong Lin, Jun-Wei Lim

    The modeling equations for predicting distillate flux in the direct contact membrane distillation (DCMD) module with embedded spiral wire of various spiral wire pitches in concentric circular module were developed theoretically and verified experimentally. The temperature distributions, distillate flux and energy consumption of both concurrent- and countercurrent-flow operations were presented with the volumetric flow rate, inlet saline temperature, the spiral wire as parameters, and the experimental data was incorporated into the modeling equations to validate the theoretical predictions. A description of the average Nusselt number was made to evolve a correlating equation of heat transfer coefficients incorporating distillate flux and Reynolds numbers with the use of experimental data. The effects of operating and design parameters such as flow rate, inlet saline temperature and spiral wire pitch on the pure water productivity and power consumption under both concurrent- and countercurrent-flow operations were also analyzed.

    更新日期:2018-06-15
  • Motion of water drops on hydrophobic expanded polymer mat surfaces due to tangential air flow
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-11-08
    M. Davoudi, E.J. Moore, G.G. Chase

    Hydrophobic expanded polymer mats are used in a wide range of industries for many purposes. Their relatively low cost, availability in a wide range of polymer materials, and consistency of pore size distribution are advantageous for some applications such as the separation of liquid drops from gas streams. When fabricated of a non-wetting material, liquid drops tend to stay on one side of the mat and can move across the mat surface due to drag of the gas flow. The rate of movement of drops on the surface can affect the rate of coalescence, the drop size, the loading of drops on the surface of the mat, and ultimately the effectiveness of the mat to separate the drops from a gas stream. In this work the movements of water drops on the surfaces of expanded polymer mats due to tangential air flow are observed to determine the effects of mat material properties and geometrical characteristics, drop dimensions and air flow conditions. A correlation for a drag coefficient of drop movement on the mat surface is developed. A second correlation for the minimum Reynolds number of the gas to initiate the movement of drop on the surface of the mat is also developed.

    更新日期:2018-06-15
  • Towards mitigation of particle/liquid separation problems by evolutionary technological progress
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-11-09
    Harald Anlauf

    The separation of particles from liquids represents a cross-sectional technology, which touches nearly every industrial process, our personal life and the environment. It is obvious, that very different separation principles and a huge variety of highly specialized apparatuses are needed to solve all separation problems in such different areas of application. Looking to the history of apparatus development one can observe several interesting analogies to evolutionary processes in biology. Motivation for development of new separation technology normally is a preferably urgent need to solve a separation problem and the pressure to be successful on the market. To be successful a new concept must offer advantages in comparison to competing solutions. In contrast to nature the creative “genius” of the engineer in combination with advanced knowledge makes new developments more targeted and faster. Some evolutionary aspects of separation technology will be discussed in the example of filters and centrifuges. According to actual trends latest developments are demonstrated and some future prospects are pointed out.

    更新日期:2018-06-15
  • Characterization of membrane fouling via single centrifugal ultrafiltration
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-11-09
    Maksym Loginov, Franco Samper, Geneviève Gésan-Guiziou, Titus Sobisch, Dietmar Lerche, Eugene Vorobiev

    The article introduces a novel method for accelerated analysis of membrane fouling during ultrafiltration of colloids: centrifugal ultrafiltration with a stepwise change of centrifugal rotation speed. The method allows simultaneous analysis of membrane fouling for different colloidal samples in a single analytical centrifugation experiment. The analysis for determination of fouled membrane resistance, specific cake resistance and reversibility of the filter cake compression is provided. The method applicability was tested with bovine serum albumin solutions at different protein concentrations. Fouled membrane resistance as well as pressure dependency of specific cake resistance was determined in a wide pressure range of 10…450 kPa. Results obtained with the help of the proposed method were in a good agreement with those obtained using the conventional method of constant pressure dead-end ultrafiltration.

    更新日期:2018-06-15
  • Effects of inhalation procedure on particle behavior and deposition in the airways analyzed by numerical simulation
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-11-21
    Kazunori Kadota, Ayumi Imanaka, Miyuki Shimazaki, Tetsushi Takemiya, Kenji Kubo, Hiromasa Uchiyama, Yuichi Tozuka

    The therapeutic effect of dry powder inhaler (DPI) formulations can be enhanced by understanding several factors that control the behavior or deposition of inhaled particles in the airways. Computational fluid dynamics (CFD) simulation was performed to predict the behavior and deposition of DPI formulations using a pulmonary model generated on the basis of computed tomography scans of a subject's airway. The effects of inhalation procedures and characteristics, such as flow rate and breath holding, on particle behavior and deposition in the airways were examined. The rate of airflow in the bifurcation area of bronchi was reduced to under 28.3 L/min because, in general, the diameter of the right bronchus is larger than that of the left bronchus in human bronchi. The region of particle deposition differed depending on the rate of airflow. The number of particles deposited in the bronchi decreased upon performing exhalation without breath holding. The results indicated that the turbulence following breath holding promoted particle deposition in the airways. CFD simulation suggested that breath holding is one of the most important factors for enhancing the therapeutic effect of DPI formulations.

    更新日期:2018-06-15
  • Effect of number of hydroxyl groups of fullerenol C60(OH)n on its interaction with cell membrane
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-12-06
    Hideya Nakamura, Yusuke Nozaki, Yuhei Koizumi, Satoru Watano
    更新日期:2018-06-15
  • Dry reforming of methane over Ni/ZrO2-Al2O3 catalysts: Effect of preparation methods
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-12-11
    Seol A Shin, Young Su Noh, Gi Hoon Hong, Ji In Park, Hyun Tae Song, Kwan-Young Lee, Dong Ju Moon

    Ni/ZrO2-Al2O3 catalysts were prepared by different methods such as modified Pechini sol-gel, urea hydrolysis, and physical mixing, and were evaluated by the dry reforming of methane under the conditions of reaction temperature of 700°C, an atmospheric pressure, and a space velocity of 25,000 h−1. It was established that the interaction between nickel and support in the dry reforming of methane depends on the preparation methods of catalyst, and plays an important role in terms of the resistance to carbon formation. From the results, we suggested that the Ni/ZrO2-Al2O3 catalyst prepared by Pechini sol-gel showed higher stability under the tested reaction conditions. These results are interpreted that the interaction between nickel and ZrO2-Al2O3 promotes the dissociation of CO2. It was considered that the catalytic stability in the dry reforming of methane over Ni/ZrO2-Al2O3 catalyst was maintained by the balance for the reaction of deposited carbon and oxygen intermediate derived from the dehydrogenation of methane and the dissociation of CO2. The results are concluded that the Ni/ZrO2-Al2O3 (PS) catalyst is a desirable catalyst with the resistance to carbon formation in the dry reforming of methane.

    更新日期:2018-06-15
  • Insights into dewatering and characterization of the waste activated sludge
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-12-18
    S.V. Jadhav, S.S. Haramkar, A.R. Kamble, B.N. Thorat
    更新日期:2018-06-15
  • A CFD study of the drawdown speed of floating solids in a stirred vessel
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-12-26
    Ruey-Chi Hsu, Chun-Kai Chiu, Shang-Chain Lin

    The drawdown of floating solids is studied through visual observation and CFD simulations in this work. Four different baffle configurations and two different impellers were used to study the effects of the baffle design, the clearance size and the impeller type on the just drawdown speed of floating solids in a stirred vessel. Particles accumulate in the vicinity of the shaft above the impeller level in the Rushton impeller system at higher speeds. A full top-to-bottom circulation loop was found in the A310 impeller system at higher speeds. Increasing the clearance can lead to a more homogeneous particle concentration distribution in the stirred vessel. The shift baffles and hollow-out baffles show superior particle drawdown performances than the standard baffles. It was also found that higher clearances result to a better drawdown rate of floating solids for both impellers. A new method has been proposed to determine the just drawdown speed based on the rotating impeller domain in the CFD simulations. The CFD predicted just drawdown speeds agree well with our experimental observations.

    更新日期:2018-06-15
  • Numerical investigation on the influence of air flow in a die filling process
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2017-12-26
    Huaqin Yao, Yuki Mori, Kazuya Takabatake, Xiaosong Sun, Mikio Sakai
    更新日期:2018-06-15
  • Effects of particle mass loading on the hydrodynamics and separation efficiency of a cyclone separator
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-01-03
    An-Ni Huang, Keiya Ito, Tomonori Fukasawa, Kunihiro Fukui, Hsiu-Po Kuo
    更新日期:2018-06-15
  • Synthesis of magnetic Fe3O4/activated carbon nanocomposites with high surface area as recoverable adsorbents
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-01-09
    Ruey-Shin Juang, Yao-Chung Yei, Chien-Shiun Liao, Kuen-Song Lin, Hsi-Chuan Lu, Sea-Fue Wang, An-Cheng Sun
    更新日期:2018-06-15
  • Magnetically responsive nano filtration membranes for treatment of coal bed methane produced water
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-01
    Heath H. Himstedt, Arijit Sengupta, Xianghong Qian, S. Ranil Wickramasinghe
    更新日期:2018-06-15
  • 更新日期:2018-06-15
  • Adsorption kinetics of the partially dissociated ionic surfactants: The effect of degree of dissociation
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-14
    Alvin Casandra, Ruey-Yug Tsay, Boris A. Noskov, Libero Liggieri, Shi-Yow Lin
    更新日期:2018-06-15
  • P promotion on the performance of Pd-based catalyst for emission control of natural gas driven vehicles
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-13
    Jianjun Chen, Wei Hu, Fujin Huang, Yang Wu, Shandong Yuan, Lin Zhong, Yaoqiang Chen
    更新日期:2018-06-13
  • Monitoring big process data of industrial plants with multiple operating modes based on Hadoop
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-06
    Jinlin Zhu, Yuan Yao, Dewei Li, Furong Gao
    更新日期:2018-06-06
  • 更新日期:2018-06-05
  • Powder characteristics for index of powder unit operation
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-15
    Kuniaki Gotoh

    It is said that designing a powder unit operation device is difficult. Hence, many of the devices are being manufactured by trial and error. The lack of correlation or connection between the output of the unit operation and the physical properties and/or characteristics of powders is the anticipated reason for this trial and error process to be needed. To advance this process, many have attempted to make a connection between the particle properties and/or powder characteristics with the result of the operation. In this manuscript, some attempts to make the connection were introduced.The oldest attempt was reported by the pioneer of powder technology. This original approach gives us many suggestions on how to best proceed. Thus, outlines of the pioneer's investigation will be introduced. Following the investigation, a concept of “Powder operational characteristics” will be explained. An example of the definition and measurement of the powder operational characteristics relating to the disruption of particle aggregate by air flow is introduced. Another example of the definition of powder operational characteristics obtained through “analysing the basic powder science in a practical and applicable way” is also introduced.

    更新日期:2018-06-03
  • Vanadium sulfide/reduced graphene oxide composite with enhanced supercapacitance performance
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-19
    Noordeen Abdul Kalam, Chinnasamy Sengottaiyan, Ramasamy Jayavel, Katsuhiko Ariga, Rekha Goswami Shrestha, Thiyagu Subramani, Sambasivam Sankar, Lok Kumar Shrestha

    Porous metal sulfide/carbon hybrid materials are promising functional composites that are extensively used in high performance supercapacitors. Here, we report electrochemical supercapacitance performance of hierarchical porous vanadium sulfide (V3S4)/reduced graphene oxide (RGO) composite (V3S4/RGO) prepared by hydrothermal method. The as prepared materials were characterized in detail by powder X-ray diffraction, scanning and transmission electron microscopy, Raman scattering, Fourier transformed infrared and X-ray photoelectron spectroscopy and the coherent growth mechanism was proposed. Porous hierarchical structure of V3S4/RGO composite material offered easy access to the ionic and electronic charge transportation and showed better electrochemical performance compared to the individual components. Specific capacitance of V3S4/RGO was found to be 520 F/g at a current density of 1 A/g with outstanding cyclic stability retaining 99.6% capacitance after 2000 charge–discharge cycles at 10 A/g. Cyclic voltammetry showed reversibility in current response both in cathodic and anodic scan and specific capacitance was found to be 500 F/g at a scan rate of 5 mV/s. These results strongly suggest that V3S4/RGO composite materials with hierarchical porous structure would be an excellent electrode material for supercapacitor applications.

    更新日期:2018-06-03
  • Perspectives on mining from sea and other alternative strategies for minerals and water recovery – The development of novel membrane operations
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-22
    Cejna Anna Quist-Jensen, Aamer Ali, Enrico Drioli, Francesca Macedonio

    An important contribution to the realization of a sustainable industrial development can be given by membrane operations. They can contribute to redesign process engineering in the logic of process intensification. In particular, the results achieved with membrane-assisted crystallization and membrane-assisted condensation show as these innovative membrane operations can overcome the performance of traditional operations: in the case of MCr, the possibility to produce specific polymorphs of crystals; in the case of the condenser, the control of the concentration of condensable contaminants in the recovered liquid stream. These two innovative membrane operations can bring interesting results for “water recovery from sky” and “water and mineral extraction from the sea”.

    更新日期:2018-06-03
  • Emulsions stabilized by pH-responsive PNIPAM-based microgels: Effect of spatial distribution of functional carboxylic groups on the emulsion stability
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-22
    Man-hin Kwok, To Ngai

    Poly(N-isopropylacrylamide-co-Methacrylic acid) (PNIPAM-MAA) microgels with different spatial distribution of functional carboxylic (COOH) groups were synthesized by a combination of semi-batch and temperature-programmed surfactant-free precipitation polymerization. This synthetic approach enabled functional COOH groups and crosslinks to be controlled in a better way so that they were either predominately concentrated at the periphery, leading to a functional dense-shell (DS), or mainly located inside the microgel, resulting in a functional dense-core (DC) particle. Because of the specially designed internal structures of these two microgels, we were able to investigate the effect of the charge group distribution on the corresponding Pickering emulsions. By examining the emulsion stability at different pH values and particle concentration using these two microgel samples as particular emulsifiers, our results showed that the soft, negatively charged microgel with a pure PNIPAM shell is the best emulsion stabilizer since the microgel is very hydrophilic and also retains its interfacial activity at the same time. On the other hand, the functional DS microgel lost most of its interfacial activity due to the dramatic increase in hydrophilicity, particularly in alkaline condition. Nevertheless, it is still capable of stabilizing oil/water emulsion by its high volume fraction in the continuous phase. Although the particles are not strongly adsorbed to the interface, the movement of the particles is significantly restrained. Therefore, they are still separating the oil droplets from coalescence.

    更新日期:2018-06-03
  • Mechanistic understanding of surface reduction of CuCeO hybrid nanoparticles for catalytic methane combustion
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-27
    Chih-Yuan Lin, Fang-Chun Chou, De-Hao Tsai

    The synergistic effect of CuCeO hybrid nanostructure has shown the promise for catalytic methane combustion. In this study, we develop an aerosol-based two-stage thermal treatment method to (1) synthesize the CuCeO hybrid nanoparticle (NP) with a tunable oxidation state directly in gas phase, and (2) provide a mechanistic understanding of surface reduction of the CuCeO hybrid NP for catalysis of methane combustion. After evaporation-induced self-assembly followed by a thermal decomposition to form metal oxide NP at the 1st stage thermal treatment, a temperature-programmed, aerosol-based hydrogen reduction process was employed for direct tuning the oxidation state of the NP in the gas phase (the 2nd stage thermal treatment). Differential mobility analysis, x-ray diffractomery, x-ray photoelectron spectroscopy, and scanning electron microscopy were employed complementarily for characterization of particle size, morphology, crystallinity, elemental composition, and oxidation state of the NPs. The results show a successful surface reduction of Cu for both Cu-only NP and CuCeO hybrid NP by the aerosol-based two-stage thermal treatment method. Using the CuCeO hybrid nanoparticle as catalyst, our results show a successfully catalysis on methane combustion over various initial oxidation states of Cu. The results show a high activity with a low light-off temperature, a high light-off stability and operation stability toward catalytic methane combustion. The prototype method proposed in this study provides the mechanistic understanding of the synergistic catalysis of the surface-reduced CuCeO hybrid nanoparticle with different oxidation states. The method can be especially useful to fabricate a variety of nanocatalysts with different oxidation states of active metals by design for the study of methane-based energy and environmental applications (e.g., CO2 dry reforming by methane).

    更新日期:2018-06-03
  • Stereolithographic and molding fabrications of hydroxyapatite-polymer gels applicable to bone regeneration materials
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-27
    Mekuriaw A. Kebede, Karen Sabrina Asiku, Toyoko Imae, Masaru Kawakami, Hidemitsu Furukawa, Chang Mou Wu

    A bone regeneration material was fabricated from hydroxyapatite-poly(dimethyl acrylamide) (HAp–PDMAAm) composite through stereolithographic 3D printing technique, and additionally, a material from HAp–agarose composite was also prepared inside a mold. Then the tensile strength and morphology of both bone regeneration materials were compared. The HAp–PDMAAm composite xerogel from 0.17 weight ratio of HAp content can resist a tensile stress of 30.2 MPa, whereas 26.2 MPa was observed in case of agarose bone composite 0.5 weight ratio of HAp content. The achieved mechanical strengths indicate that the products can be applicable as bone regenerative medicine and the utilized fabrication technique plays a significant role toward patient-specific bioprinting technology.

    更新日期:2018-06-03
  • The properties of water in concentrated surfactant and colloid systems
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-27
    Gordon J.T. Tiddy

    Water is the most common component in almost all surfactant and colloid products, being present in the manufacture processes and/or the final product. Concentrated surfactants form liquid crystals with various structures (lamellar, hexagonal, cubic, etc.) and a wide range of properties. The link between surfactant structure and liquid crystal architecture (“nanostructure”) has been established. In dilute solutions the hydrophobic effect (an entropic mechanism) underpins the formation of micelles, the building blocks of liquid crystals. Water next to hydrocarbon chains is at lower entropy due to sampling a reduced number of configurations compared to bulk water. In the past, explanations of this entropy decrease have invoked layers of “structured water” which are not supported by experiment. Liquid crystals have long-range ordered structures as with conventional crystals (solids). The nuclear magnetic resonance (NMR) spectra of non-cubic liquid crystals exhibit multiple transitions (quadrupole splittings) which reflect the mobility and degree of ordering of water and ions. Measurements on both ionic and non-ionic surfactants show three different states of water: free, bound and “disrupted”. A simple model predicts that the amount of bound water passes through a maximum with increasing surfactant concentration. Counter intuitively, at very high surfactant concentrations there is an increase in free water levels.

    更新日期:2018-06-03
  • Encapsulated silver nanoparticles in water/oil emulsion for conductive inks
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-02-28
    Chia-Wei Chang, Ting-Yu Cheng, Ying-Chih Liao

    Silver nanoparticle (AgNP) inks are the most commonly used conductive ink for printed conductive tracks. However, the ink stability against aggregation and sedimentation is poor and results in short shelf life, severe nozzle clogging, and bad printing qualities. Herein, a new method is developed to improve the stability of AgNP inks. In this work, a water-in-oil type emulsion is used as a carrier for water-based silver nanoparticles. Different water/surfactant ratio are examined for the complete AgNP uptake in water nano droplets. The morphology of AgNP after emulsification is carefully examined with electro-microscopy to elucidate the particle engulfment in water. The encapsulated AgNP show a much lower sedimentation rate due to the greatly reduced overall density of encapsulated AgNPs/water droplets. Moreover, the water/oil interfaces around AgNPs prevent aggregations, and thus leads to better long-term ink stability. The physical properties of AgNP emulsion meet the requirement of the printer and stable inkjet droplet can be produced. Conductive tracks with electrical resistance 4.92 μΩ-cm and line width 170 µm can be printed on photo papers, which demonstrates the potential of the emulsion for inkjet printing application.

    更新日期:2018-06-03
  • Poroelasticity of cellulose hydrogel
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-05
    Noriyuki Isobe, Satoshi Kimura, Masahisa Wada, Shigeru Deguchi

    The poroelasticity of cellulose hydrogels was studied by a series of compression tests. The stiffness of the cellulose hydrogel was found to be independent on the crystallinity of a skeletal gel matrix, suggesting that the poroelasticity made a significant contribution to mechanical properties of the hydrogel. Indeed, typical poroelastic responses were observed when the cellulose hydrogels were subjected to the compression tests with varied compression strain rates (i.e. softness upon slow compression but stiffness upon fast compression). The fluid mechanics theory showed that sub-micrometer-scale morphological difference of the gel matrix, which was observable by scanning electron microscopy, affected the flow behavior of water inside porous structure, leading to the increased stiffness upon fast compression.

    更新日期:2018-06-03
  • Hybridization of carbon-dots with ZnO nanoparticles of different sizes
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-07
    Mulugeta Tesema Efa, Toyoko Imae

    ZnO nanoparticles were hybridized with carbon dots (Cdots) and the hybrids were characterized. ZnO(100) and ZnO(20) with particle sizes of 94 and 20 nm, respectively, were synthesized by calcination and polyol solvent methods, respectively. The morphology, size and crystallinity of ZnO nanoparticles were not varied by the addition of Cdots. The spectroscopic results indicated the successful attachment of Cdots to ZnO nanoparticles. The specific surface area of ZnO(20) was larger than ZnO(100) and increased with the hybridization of Cdots. When the amount of ethylenediamine against citric acid between raw materials of Cdots was increased, the existence of nitrogen in Cdots became recognized. The band gap increased with decreasing particle size, and the addition of Cdots decreased the band gap of ZnO. Thus, these results suggest that the hybrids of ZnO with Cdots may exert the performance on photocatalysis and photovoltaic electrochemistry.

    更新日期:2018-06-03
  • Enhanced physical stability of positively charged catanionic vesicles: Role of cholesterol-adjusted molecular packing
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-07
    An-Tsung Kuo, Cheng-Lin Tu, Yu-Min Yang, Chien-Hsiang Chang

    A pseudodouble-chain ion pair amphiphile, hexadecyltrimethylammonium-dodecylsulfate (HTMA-DS), and a double-chain cationic surfactant, ditetradecyldimethylammonium bromide (DTDAB), were used as the main materials to form positively charged catanionic vesicles with various cholesterol contents. The effects of cholesterol on physical stability of the charged catanionic vesicles were then investigated by size, zeta potential, and Fourier transform infrared analyses. With the presence of cholesterol, the physical stability of the vesicles was enhanced. The inclusion of cholesterol would increase the distance between the charged headgroups of the vesicle-forming molecules and reduce the tendency of the counterion binding onto the charged vesicle surfaces, leading to a more pronounced charge character of the vesicles. Furthermore, with the incorporation of cholesterol, the sterol ring of cholesterol tended to maximize the contact with neighboring hydrocarbon chains, thus improving the bilayer mechanical strength. In the meantime, the alkyl side-chain of cholesterol together with the segments of the hydrocarbon chains near the ends in the vesicle-forming molecules could form flexible regions within the vesicular bilayers. Thus the presence of cholesterol in the bilayer structures of HTMA-DS/DTDAB catanionic vesicles not only enhanced the inter-vesicular electrostatic repulsion but also adjusted the intra-vesicular molecular packing, resulting in improved physical stability of the vesicles.

    更新日期:2018-06-03
  • Colloidal stabilization of surfactant-free emulsion by control of molecular diffusion among droplets
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-07
    Toshio Sakai, Taku Oishi

    Colloidal stability of water-in-oil (W/O) emulsions in the absence of any emulsifiers such as surfactants and amphiphilic polymers (named as surfactant-free W/O emulsions) was enhanced with the addition of small amount of electrolyte in water. The colloidal stabilization of surfactant-free W/O emulsions with the addition of small amount of electrolyte in water was observed in the case of various electrolytes (sodium chloride; NaCl, potassium chloride; KCl, magnesium chloride; MgCl2, aluminum chloride; AuCl3, sodium bromide; NaBr, and sodium iodide; NaI) and various oils (hydrocarbon oils, higher fatty acids and vegetable oils) as continuous phases. We proposed a mechanism that the colloidal stabilization of surfactant-free W/O emulsions with the addition of small amount of electrolyte in water was attributed to the reversible diffusion of water molecules among water droplets afforded by different sizes of water droplets (Ostwald ripening) (as described by Kelvin's law) and difference concentrations of electrolyte in water droplets (as described by Raoult's law).

    更新日期:2018-06-03
  • Nanocrystallization effect on luminescence properties of polymer–metal complex with different kinds of ligands
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-08
    Ryuju Suzuki, Tsunenobu Onodera, Shigeru Deguchi, Hitoshi Kasai, Hidetoshi Oikawa

    We have successfully fabricated a series of polymer–metal complex [{Cu2(µ-Br)2(PPh3)2}(µ-PyX)]n nanocrystals (NCs) with different kinds of ligands. Interestingly, the luminescence spectrum of the NCs of [{Cu2(µ-Br)2(PPh3)2}(µ-PyX)]n were red-shifted, compared with those of their corresponding bulk crystals. IR spectra of [{Cu2(µ-Br)2(PPh3)2}(µ-Py2)]n, whose ligand had a phenyl linker between two pyridine rings, revealed that the conformation of the coordinated Py2 ligand in the NCs was different from that in the bulk crystal, but similar to that of the un-coordinated Py2 ligand. The results suggest that the rotational degree of freedom in the PyX ligands would affect the looseness of the crystal lattice in the polymer–metal complex NCs, thereby affecting their luminescence properties.

    更新日期:2018-06-03
  • Membrane fouling during water or wastewater treatments: Current research updated
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-08
    Yin-Ru Chang, Yu-Jen Lee, Duu-Jong Lee

    Membrane fouling is the single most influential factor that limits the membrane process performance in long-term operation. This mini-review reviewed the currently available review papers on membrane fouling studies and summarized the research trends from the conclusions highlighted by these reviews. On foulant aspect, the origin of novel foulants and the biofoulants are widely studied. On characterization and control strategy aspect, novel characterization tools and low-fouling membranes are to be proposed and tested, and the conventional and novel control strategies are under development. On mechanism part, the use of extended blocking models and the extended interfacial interaction models on interpreting fouling behavior is a research focus.

    更新日期:2018-06-03
  • Hybridization of cellulose nanofiber with amine-polymers and its ability on sick house syndrome gas decomposition
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-08
    Masaki Ujihara, Min-Hsuan Hsu, Jia-Yi Liou, Toyoko Imae

    As an environment-conscious catalyst, a nanocomposite of Pt nanoparticles supported by dendrimer and cellulose nanofiber was designed. The poly(amido amine) dendrimer was immobilized, by the amidation reaction, on the 2,2,6,6-tetramethyl-1-piperdinyloxy free radical oxidized cellulose nanofiber (TOCNF), and its binding ratios at different mixing ratios were colorimetrically analyzed. The results showed that the dendrimer bound on TOCNF caused a saturation, while polyethyleneimines (PEIs) almost linearly increased the binding mass ratio per TOCNF as the mixing ratio rose. The dendrimer/TOCNF formed a viscoelastic gel in wide mixing ratios, while the PEIs/TOCNF varied their gel characters depending on molecular weight of PEI and mixing ratio. The Pt nanoparticle-incorporated dendrimer (DENPtNPs) was chemically bound on TOCNF. The TOCNF/DENPtNPs gels were dried to form solid films, and then applied for the decomposition of formaldehyde in gas phase. It was demonstrated that the dendrimer effectively captured formaldehyde and the PtNPs decomposed it. These results would be useful to develop catalytic nanocomposite membranes.

    更新日期:2018-06-03
  • Fast estimation of protein conformational preference at air/water interface via molecular dynamics simulations
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-09
    Meng-huai Han, Chi-cheng Chiu

    Understanding the protein structural stability and thus its functional integrity at interface are critical for its biotechnology application development. Conventionally, it requires two extensive free energy calculations of protein in bulk and at interface to evaluate the conformational preference change during the adsorption. In this work, we derive an estimation of adsorption free energy at air/water interface for a protein in a defined conformation with the contributions of partial desolvation ΔGdesolv and surface energy ΔGa/w, which can be quickly evaluated from equilibrium MD trajectories. Via thermodynamics cycle, the free energy variation of α-helix to β-hairpin transition during the adsorption ΔΔGwat→intα→β can be obtained from the difference between the adsorption free energies of the two conformations. Applying the method, we estimate ΔΔGwat→intα→β of 6.31kJ/mol for DP5, in excellent agreement with the MD free energy data of 6.35 kJ/mol. Consistent results for four other tested proteins compared with MD free energy calculation further validate the derived adsorption model. The combination of MD simulations and thermodynamic estimations provide valuable physical insights for protein interfacial folding behaviors and serve as basis for developing prediction tools of protein conformations at interface.

    更新日期:2018-06-03
  • Reactivity of solid residue from hydrothermal liquefaction of diatom in oxidizing atmosphere
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-09
    Chihiro Fushimi, Mana Yazaki, Ryo Tomita

    The reactivity of solid residue (char) derived from diatom (Fistulifera sp.) after hydrothermal liquefaction (HTL) reaction at 673 K, 10 MPa, 30 min was investigated during oxidation in air at 553 − 1073 K. Results indicate the derivative thermo-gravimetric (DTG) curve of HTL char showed very small peak below 600 K, indicating HTL reaction effectively decomposed lipid, carbohydrates and protein. The activation energies of the HTL char derived from diatom during combustion up to 1073 K by FWO and KAS methods was 120.0 and 115.3 kJ/mol, respectively, when the char conversion α is 0.2 − 0.5 (i.e. pyrolysis). At higher char conversion (α ≥ 0.5), the activation energy monotonically increased as combustion reaction proceeds. However, this increment of activation energy of HTL char derived from diatom during oxidation stage was much smaller than those of de-oiled microalgae char reported in the literature. The HTL char derived from diatom has porous structure (specific surface area: 293.2 m2/g and total pore volume: 0.672 cm3/g). It was found this porosity is derived both the silicon structure of diatom and remaining carbon after HTL reaction. The total amount of oxygen functional groups (OFG) substantially increased by oxidation at 553 and 573 K. By holding the reaction temperature at 553 K up to 60 min, the total OFG monotonically increased to 1.04 mmol/g. At 573 K, the amount of total OFG peaked 1.08 mmol/g at 30 min and decreased. The decomposition of carboxyl groups is dominant reaction for reduction in total OFG after 30 min at 573 K during oxidation. The tendencies of BET surface area and total pore volume of char agreed with these results of char during oxidation.

    更新日期:2018-06-03
  • Effects of high turbidity seawater on removal of boron and transparent exopolymer particles by chemical oxo-precipitation
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-13
    Justin Chun-Te Lin, Chin-Yi Wu, Yung-Lun Chu, Winn-Jung Huang

    Boron and transparent exopolymer particles (TEP) in seawater presented two hurdles in desalination as the former can pass through reverse osmosis easily and the latter can induce membrane biofouling. Chemical oxo-precipitation (COP) was evaluated and its feasibility of boron removal in seawater during normal conditions and high turbidity caused by a typhoon. Various COP conditions in seawater were conducted by a series of jar tests for seawater sampled from an intake of desalination pilot plant. Both boron concentrations in upper liquids using FeCl3 or BaCl2 as coagulant were found increased linearly with increasing oxidant amounts after addition of H2O2 as an oxidant. However, colloidal TEP and particle analysis by nanoparticle tracking analysis provided more insights of the aggregated sizes. Effects of three COP operational parameters on the removal of boron and TEP as well as turbidity were investigated and optimized by a response surface methodology via Box–Behnken design. These results provide a good reference in design feasible pre-treatment dealing with the two current hurdles of seawater RO systems.

    更新日期:2018-06-03
  • Polyion complexation in solution, at interface and on surface: Legacy for layer-by-layer assembly
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-19
    Toyoki Kunitake

    This short review describes the history of scientific development of layer-by-layer assembly of charged polymers. Early studies of 1960s and 1970s include binding and complex formation of oppositely charged polymers and colloids. The subsequent studies in 1980s showed that stable molecular assemblies such as monolayer at the air–water interface and aqueous bilayer membrane were useful as partners of polyion complexation. Charge reversal due to excessive adsorption on the charged surface was established by surface forces measurement in early 1990s. Decher and Hong published their epoch-making paper in 1992.

    更新日期:2018-06-03
  • Impingement of Triton X-100 solution drops on paraffin film–Relaxation of surface dilational rate
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-19
    Shi-Yow Lin, Alvin Casandra, Yosephine Y. Margaretha, Ruey-Yug Tsay

    The impact dynamics of a solution drop of Triton X-100 impinging on a paraffin film was studied, specifically to develop a new method for evaluating the in situ surface dilational rate, λ. The drop images (side and top views) during the impingement process were sequentially digitized and used to calculate the interfacial areas of the liquid-air and liquid-solid interfaces. The data of interfacial area were then used to calculate the relaxation of λ. The surface dilational rate showed a strong oscillation at the beginning of the drop impact. It oscillated from 0 down to −390/s, up to 290/s, and then down to −200/s. This surface dilational rate is far above 2.4/s, which is the lower limit of λ for an expanding pendant bubble in a Triton X-100 solution with an isolated air-liquid surface (Lin et al., 2017). A simple but useful theoretical framework is given for the calculation of the dynamic surface dilational rate, surface concentration and surface tension of an impinging drop of surfactant solution.

    更新日期:2018-06-03
  • Effect of molecular weight of poly(acrylic acid) on the interaction of oppositely charged ionic surfactant–polyelectrolyte mixtures
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-26
    Hsueh-Wen Tseng, Po-Chia Chen, Hung-Wei Tsui, Chieh-Hsiang Wang, Ting-Yu Hu, Li-Jen Chen

    The isothermal titration calorimetry was applied to investigate the effect of molecular weight (MW) of poly(acrylic acid) (PAA) on the interaction of tetradecyltrimethyl ammonium bromide (C14TAB) with PAA in the bulk phase. The initial formation of PAA/C14TAB complexes was driven by electrostatic interactions between the cationic head groups of C14TAB and the oppositely charged PAA chains, resulting in enhanced hydrophobicity of the complexes. The further addition of C14TAB would induce either complex-C14TAB interaction or complex–complex interaction due to hydrophobic effect. Increasing the MW of PAA would enhance the tendency of complex–complex interaction to form aggregation and even precipitation. For PAA MW ≥ 130,000, significant precipitation of interpolymer complexes was consistently observed and all the obtained critical micelle concentration, phase separation concentration, heat of complexation, and heat of micellization were independent of MW. For PAA MW of 25,000, the complexes formed visible millimetric aggregates at phase separation concentration. With further addition of C14TAB, these aggregates gradually dissolved, and the solution became clear again. For PAA at an MW of ≤5000, turbidity was observed in a wide range of concentrations, but no macroscopic precipitation was observed and the solutions were always homogeneous.

    更新日期:2018-06-03
  • Low-temperature processing of Garnet-type ion conductive cubic Li7La3Zr2O12 powders for high performance all solid-type Li-ion batteries
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-28
    Jeevan Kumar Padarti, Taruna Teja Jupalli, Chie Hirayama, Mamoru Senna, Takahiko Kawaguchi, Naonori Sakamoto, Naoki Wakiya, Hisao Suzuki

    Synthesis of lithium stuffed cubic Li7La3Zr2O12 (c-LLZO) garnet at low-processing temperatures is hampered by the lack of deep understanding on powder processing technology. The present article proposes a hybrid solid-state approach to accomplish controllable synthesis of Al doped LLZO cubic garnet oxide nanoparticles at low-processing temperatures. In this procedure, powders of ZrO2 and La(OH)3 in ethanol based suspension were mechanochemically (MC) treated along with 1 wt.% of AlOOH in a planetary ball mill with increasing milling time to increase the homogeneity of the precursor. Lithium acetate in the form of an ethanolic solution was subsequently added for the solid-state synthesis of single phase LLZO. Cubic LLZO phases were obtained at temperatures i.e. 700 °C within 3 h. The ease of lithium diffusion in these MC activated La-Zr precursor materials is attributed to the formation of single phase LLZO with the lowest Al3+ doping content. The sintered pellets (94% relative density at 1100°C for 3 h in air) of the newly obtained Li6.61La3Zr2Al0.13O11.98 deliver high bulk Li-ion conductivity of 1.35 × 10−4 Scm-1. The new low-temperature processing of typical garnet and the use of c-Li6.61La3Zr2Al0.13O11.98 nanoparticles could open pathways toward future solid electrolyte–electrode assembly options for all-solid state Li-ion batteries.

    更新日期:2018-06-03
  • CO2-responsive poly(N,N-dimethylaminoethyl methacrylate) hydrogels with fast responsive rate
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-03-30
    Xiao-Ying Li, Rui Xie, Feng Luo, Zhi-Han Jia, Kun Shi, Xiao-Jie Ju, Wei Wang, Zhuang Liu, Liang-Yin Chu

    CO2-responsive hydrogels have attracted increasing and extensive attention from various fields such as sensors and controlled drug delivery systems. However, the traditional CO2-responsive hydrogels suffer from unsatisfied responsive rate, which has limited their practical applications. Herein, we report on novel CO2-responsive poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) hydrogels with fast responsive rate, which resulted from an open-celled porous structure inside the hydrogels. Oil-in-water emulsion templates prepared by microfluidic emulsification are used as porogens for synthesis of PDMAEMA hydrogels with open-celled porous structures. The open-celled porous structures provide numerous interconnected diffusion channels for the water transfer during the swelling process of PDMAEMA hydrogels. The effects of interconnectivity and size of pores on the CO2-responsive rate of hydrogels are systematically investigated. The results show that the responsive rates of open-celled porous PDMAEMA hydrogels are much faster than that of the normal ones during the dynamic swelling processes. The open-celled hydrogels with large pore size exhibit the dramatic swelling after bubbling CO2 for 20 s, and the maximum swelling rate is 30 times faster than that of normal hydrogels. The proposed new strategy for preparation of CO2-responsive hydrogels with fast responsive rate may provide ever better performances for CO2-responsive hydrogels in their myriad applications.

    更新日期:2018-06-03
  • Mechanisms study of silicotungstic acid modified CeO2 catalyst for selective catalytic reduction of NOx with NH3: Effect of pH values
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-01
    Zhongxian Song, Lanying Wang, Qiulin Zhang, Ping Ning, Jia Hu, Tong Tang, Xin Liu, Bin Li
    更新日期:2018-06-02
  • High-throughput CO2 capture for biogas purification using monoethanolamine in a microtube contactor
    J. Taiwan Inst. Chem. E. (IF 4.217) Pub Date : 2018-06-02
    Nattee Akkarawatkhoosith, Amaraporn Kaewchada, Attasak Jaree

    The utilization of biogas is somewhat limited by its composition especially CO2. The CO2 content in biogas can be substantially reduced via chemical absorption. In this work, the absorption performance of CO2 removal from biogas using aqueous monoethanolamine (MEA) in a T-type microchannel (0.5 × 0.5 × 60 mm3) was experimentally investigated. The effects of operating parameters including MEA-to-CO2 molar ratio, temperature, pressure, and flow rate of MEA solution were studied in terms of main and interaction effects via statistical analysis. Temperature and MEA-to-CO2 molar ratio showed relatively strong influence on both %absorption and the liquid-side volumetric mass transfer coefficient. A positive confounding effect between these two parameters was also present. Hence, high temperature and high molar ratio resulted in high performance CO2 removal from biogas. Methane purity of 90% was obtained with the molar ratio of 1.8 at 50 °C. The kLa of 517 s−1 was achieved at the MEA-to-CO2 molar ratio of 5:1, 50 °C, 2 bar, and 3 mL/min of the MEA solution. In addition, the absorption flux of CO2 in MEA solution, overall mass transfer coefficient, and kinetic rate constant were evaluated to interpret the experimental results.

    更新日期:2018-06-02
  • 更新日期:2018-06-02
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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