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Improving the catalytic activity of bentonite-based bismuth ferrites composite via mechanical activation for photo-Fenton process
Materials Chemistry and Physics ( IF 4.6 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.matchemphys.2020.124118
Guangtao Wei , Yanjuan Yang , Yunshang Li , Linye Zhang , Zhongmin Li , Runlin Mo

Abstract A bentonite-based bismuth ferrites (BiFe/Bent) composite has been fabricated by a sol-gel process in our previous study. To further improve the catalytic activity of BiFe/Bent in photo-Fenton reaction, the activation of BiFe/Bent by mechanical activation process was studied in this work. The effects of on the catalytic activity and physicochemical change of activated composite (A-BiFe/Bent) were investigated. The optimum conditions for activation of BiFe/Bent were as follows: filling ratio of grinding medium 30%, Ф10 balls as grinding medium, rotation speed of planet carrier 600 rpm, milling time 30 min, and mass of composite activated 5 g·L-1 (per unit volume of milling chamber). After mechanical activation, besides the improvement from the activity components of BiFeO3 and Bi2Fe4O9, the changes in the microstructure of activated composite, including enhanced specific surface area, improved pore structure, high defectiveness in structure, and small size of activity components, were the main reasons for the improved catalytic activity of A-BiFe/Bent. Compared with that of BiFe/Bent, the catalytic activity of A-BiFe/Bent was improved about by 1-fold, and the A-BiFe/Bent exhibited good stability and low Fe leaching. It was advisable to implement mechanical activation as a strategy to promote the catalytic efficiency of BiFe/Bent.

中文翻译:

光芬顿过程机械活化提高膨润土基铁氧体铋复合材料的催化活性

摘要 在我们之前的研究中,我们通过溶胶-凝胶工艺制备了一种基于膨润土的铁氧体铋(BiFe/Bent)复合材料。为了进一步提高BiFe/Bent在光-芬顿反应中的催化活性,本工作研究了机械活化过程对BiFe/Bent的活化。研究了 对活化复合材料(A-BiFe/Bent)的催化活性和理化变化的影响。BiFe/Bent活化的最佳条件为:研磨介质填充率30%,研磨介质Ф10球,行星架转速600 rpm,研磨时间30 min,复合活化质量5 g·L- 1(每单位体积的研磨室)。机械活化后,除了BiFeO3和Bi2Fe4O9活性成分的提高外,A-BiFe/Bent催化活性提高的主要原因是活化复合材料微观结构的变化,包括比表面积增大、孔结构改善、结构缺陷率高、活性组分尺寸小等。与BiFe/Bent相比,A-BiFe/Bent的催化活性提高了约1倍,并且A-BiFe/Bent表现出良好的稳定性和低Fe浸出。建议实施机械活化作为提高 BiFe/Bent 催化效率的策略。A-BiFe/Bent 的催化活性提高了约 1 倍,并且 A-BiFe/Bent 表现出良好的稳定性和较低的 Fe 浸出率。建议实施机械活化作为提高 BiFe/Bent 催化效率的策略。A-BiFe/Bent 的催化活性提高了约 1 倍,并且 A-BiFe/Bent 表现出良好的稳定性和较低的 Fe 浸出率。建议实施机械活化作为提高 BiFe/Bent 催化效率的策略。
更新日期:2021-02-01
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