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Comprehensive kinetic and mass transfer modeling for methylene blue dye adsorption onto CuO nanoparticles loaded on nanoporous activated carbon prepared from waste coconut shell
Journal of Molecular Liquids ( IF 6 ) Pub Date : 2020-03-21 , DOI: 10.1016/j.molliq.2020.112949
Anuj Kumar Prajapati , Monoj Kumar Mondal

The waste coconut shell (WCS) was used for the preparation of nanoporous activated carbon (NPAC) by chemical and physical activation method. The synthesized CuO nanoparticles were successfully loaded on the NPAC by the physical adsorption method. Different characterization techniques such as XRD, FT-IR, BET surface area, point of zero charge (pHpzc), SEM, TEM, SADE pattern, particle size distribution, and XPS were used to determine the physical-chemical properties of the CuO-NPAC nanocomposite. Thus, the prepared nanocomposites were used for methylene blue (MB) dye adsorption from aqueous solution by varying batch experimental parameters, such as initial MB dye concentration, initial pH, contact time, temperature, SDS concentration and amount of nanocomposite. In this work, a kinetic model was developed, and the developed kinetic equation was fitted with experimental data, and compared with several traditional models, such as the pseudo-second-order and Elovich models. The mass transfer mechanism was described by four diffusion models, such as Weber-Morris, liquid diffusion, Bangham's and Burt, and McKay et al. models. Adsorption equilibrium data were fitted to non-linear form of conventional isotherm models such as Langmuir, Freundlich, and Sips models, and according to high R2 values, the Sips model was best fitted followed by Langmuir and Freundlich. The possible reaction mechanism for the adsorption of MB onto the CuO-NPAC nanocomposite has also been suggested. The thermodynamic studies confirmed spontaneous adsorption of MB onto CuO-NPAC nanocomposites and showed suitability at high temperatures. The regeneration study of nanocomposite was accomplished by HCl, H2SO4, ethanol, double distilled water, and NaOH to determine the suitable reagent for the same.



中文翻译:

用于亚甲基蓝染料吸附在负载在由废弃椰子壳制备的纳米孔活性炭上的CuO纳米颗粒上的综合动力学和传质模型

利用废椰子壳(WCS)通过化学和物理活化方法制备了纳米孔活性炭(NPAC)。通过物理吸附法将合成的CuO纳米颗粒成功地负载在NPAC上。不同的表征技术,例如XRD,FT-IR,BET表面积,零电荷点(pH pzc),SEM,TEM,SADE图案,粒度分布和XPS用于确定CuO-NPAC纳米复合材料的物理化学性质。因此,通过改变批实验参数,例如初始MB染料浓度,初始pH,接触时间,温度,SDS浓度和纳米复合物的量,将制备的纳米复合物用于从水溶液中吸附亚甲基蓝(MB)染料。在这项工作中,开发了一个动力学模型,并将开发的动力学方程与实验数据拟合,并与几种传统模型进行了比较,例如伪二阶模型和Elovich模型。传质机理由四个扩散模型描述,例如Weber-Morris,液体扩散,Bangham's和Burt以及McKay等。楷模。2个值时,最适合Sips模型,其次是Langmuir和Freundlich。还提出了将MB吸附到CuO-NPAC纳米复合材料上的可能的反应机理。热力学研究证实了MB自发吸附在CuO-NPAC纳米复合材料上,并显示了在高温下的适用性。纳米复合材料的再生研究是通过HCl,H 2 SO 4,乙醇,双蒸馏水和NaOH进行的,以确定合适的试剂。

更新日期:2020-03-22
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