Mechanism for enhanced degradation of clofibric acid in aqueous by catalytic ozonation over MnOx/SBA-15.

作者: Qiangqiang Sun , Yu Wang , Laisheng Li , Jishuai Bing , Yingxin Wang

DOI: 10.1016/J.JHAZMAT.2014.12.050

关键词:

摘要: Comparative experiments were conducted to investigate the catalytic ability of MnO(x)/SBA-15 for ozonation clofibric acid (CA) and its reaction mechanism. Compared with alone, degradation CA was barely enhanced, while removal TOC significantly improved by (O3/MnO(x)/SBA-15). Adsorption intermediates proved unimportant in O3/MnO(x)/SBA-15 due insignificant adsorption little variation after ceasing ozone stopped-flow experiment. The more remarkably inhibition effect sodium bisulfite (NaHSO3) on than alone elucidated that facilitated generation hydroxyl radicals (OH), which further verified electron spin-resonance spectroscopy (ESR). Highly dispersed MnO(x) SBA-15 believed be main active component MnO(x)/SBA-15. Some indentified different routes proposed both ozonation. amounts small molecular carboxylic acids (i.e., formic (FA), acetic (AA) oxalic (OA)) generated lower resulting from OH.

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