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Environmentally superior cleaning of diatom frustules using sono-Fenton process: Facile fabrication of nanoporous silica with homogeneous morphology and controlled size.
Ultrasonics Sonochemistry ( IF 8.7 ) Pub Date : 2020-02-26 , DOI: 10.1016/j.ultsonch.2020.105044 Peyman Gholami 1 , Alireza Khataee 2 , Amit Bhatnagar 3
Ultrasonics Sonochemistry ( IF 8.7 ) Pub Date : 2020-02-26 , DOI: 10.1016/j.ultsonch.2020.105044 Peyman Gholami 1 , Alireza Khataee 2 , Amit Bhatnagar 3
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Existing techniques for the preparation of silica structures from diatom cells include cleaning of frustules through baking at high temperature and oxidant cleaning using concentrated sulfuric acid, hydrogen peroxide, nitric acid, or sodium dodecyl sulfate (SDS)/ethylenediaminetetraacetic acid (EDTA). In this study, sono-Fenton (SF) process was examined to prepare nanoporous silica through cleaning diatom frustules, while preserving their structural features. Single colonies of Cyclotella sp. were cultivated in batch mode f/2-enriched seawater. Combination of Fenton process with ultrasonication was found to be more efficient than the sum of individual processes in the removal of organic compounds from Cyclotella sp. structure. The optimized amounts of operational parameters were determined as suspension pH of 3, diatom cell density of 4.8 × 105 cell mL-1, H2O2 concentration of 60 mM, Fe2+ concentration of 15 mM, ultrasound irradiation power of 400 W and the temperature of 45 °C. The results of energy-dispersive X-ray spectroscopy (EDX) and thermal gravimetry (TG) analyses proved that organic materials covering the cell wall were significantly removed from the frustules through SF process. Scanning electron microscopy (SEM) images showed that after SF treatment, silica nanostructures were produced having uniform pores less than 15 nm in diameter. N2 adsorption-desorption isotherms demonstrated that almost non-porous structure of diatom frustules became mesoporous during removing the organic matrix. Lipids, amino acids, carbohydrates and organic acids or their oxidized products were identified using GC-MS analysis as the main organic compounds released from diatom cells to the solution after SF treatment. Treated frustules exhibited adsorption capability of 91.2 mg/g for Methylene Blue, which was almost 2.5 times higher than that of untreated frustules (34.8 mg/g).
中文翻译：
使用sono-Fenton工艺对硅藻壳进行环境友好的清洁：易于制造形态均匀且尺寸可控的纳米多孔二氧化硅。
用于从硅藻池制备二氧化硅结构的现有技术包括：通过高温烘烤来清洁硬壳，以及使用浓硫酸，过氧化氢，硝酸或十二烷基硫酸钠（SDS）/乙二胺四乙酸（EDTA）进行氧化剂清洁。在这项研究中，研究了声-芬顿（SF）工艺，通过清洁硅藻壳来制备纳米多孔二氧化硅，同时保留其结构特征。Cyclotella sp。的单菌落。以分批模式富集f / 2的海水进行养殖。Fenton工艺与超声处理相结合比从单个小环藻中去除有机化合物的效率更高。结构体。确定最佳操作参数量为悬浮液pH为3，硅藻细胞密度为4。8×105细胞mL-1，H2O2浓度为60 mM，Fe2 +浓度为15 mM，超声辐射功率为400 W，温度为45°C。能量色散X射线光谱（EDX）和热重分析（TG）分析的结果证明，通过SF过程，覆盖在细胞壁上的有机物质已从壳层中显着去除。扫描电子显微镜（SEM）图像显示，在SF处理之后，产生具有小于15nm直径的均匀孔的二氧化硅纳米结构。N 2吸附-解吸等温线表明，在除去有机基质期间，硅藻壳的几乎无孔结构变成了中孔。脂质，氨基酸，使用SF-处理后，使用GC-MS分析确定了碳水化合物和有机酸或其氧化产物是从硅藻细胞释放到溶液中的主要有机化合物。处理过的果壳对亚甲基蓝的吸附能力为91.2 mg / g，几乎是未处理果壳（34.8 mg / g）的2.5倍。
更新日期：2020-02-27
中文翻译：
使用sono-Fenton工艺对硅藻壳进行环境友好的清洁：易于制造形态均匀且尺寸可控的纳米多孔二氧化硅。
用于从硅藻池制备二氧化硅结构的现有技术包括：通过高温烘烤来清洁硬壳，以及使用浓硫酸，过氧化氢，硝酸或十二烷基硫酸钠（SDS）/乙二胺四乙酸（EDTA）进行氧化剂清洁。在这项研究中，研究了声-芬顿（SF）工艺，通过清洁硅藻壳来制备纳米多孔二氧化硅，同时保留其结构特征。Cyclotella sp。的单菌落。以分批模式富集f / 2的海水进行养殖。Fenton工艺与超声处理相结合比从单个小环藻中去除有机化合物的效率更高。结构体。确定最佳操作参数量为悬浮液pH为3，硅藻细胞密度为4。8×105细胞mL-1，H2O2浓度为60 mM，Fe2 +浓度为15 mM，超声辐射功率为400 W，温度为45°C。能量色散X射线光谱（EDX）和热重分析（TG）分析的结果证明，通过SF过程，覆盖在细胞壁上的有机物质已从壳层中显着去除。扫描电子显微镜（SEM）图像显示，在SF处理之后，产生具有小于15nm直径的均匀孔的二氧化硅纳米结构。N 2吸附-解吸等温线表明，在除去有机基质期间，硅藻壳的几乎无孔结构变成了中孔。脂质，氨基酸，使用SF-处理后，使用GC-MS分析确定了碳水化合物和有机酸或其氧化产物是从硅藻细胞释放到溶液中的主要有机化合物。处理过的果壳对亚甲基蓝的吸附能力为91.2 mg / g，几乎是未处理果壳（34.8 mg / g）的2.5倍。
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