文献类型：期刊文献

英文题名：Insight into the role of reactive species on catalyst surface underlying peroxymonosulfate activation by P–Fe2MnO4 loaded on bentonite for trichloroethylene degradation

作者：Feng, Meiyun[1]; Xu, Zhiqiang[1]; Li, Jianan[1,2]; Wang, Ning[3]; Lin, Kuangfei[1]; Zhang, Meng[1,4]

机构：[1] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Zhejiang Tiandi Environmental Protection Technology Co., Ltd., Hangzhou, 310000, China; [3] School of Science, Key Laboratory of High Performance Scientific Computation, Xihua University, Chengdu, 610039, China; [4] Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China

年份：2024

卷号：357

外文期刊名：Chemosphere

收录：EI(收录号：20241615932334)

语种：英文

外文关键词：Bentonite - Binding energy - Binding sites - Catalysts - Catalytic oxidation - Chemical activation - Electron transport properties - Free radical reactions - Free radicals - Hydrogen bonds - Manganese compounds - Morphology - Rate constants

摘要：In this study, bentonite supporting phosphorus-doped Fe2MnO4 (BPF) was synthesized and applied for PMS activation to degrade TCE. Morphology and structure characterization results indicated the successfully synthesized of BPF, and the BPF/PMS system not only featured high TCE removal (97.4%) but also high reaction rate constant (kobs = 0.0554 min?1) and PMS utilization (70.4%, kobs = 0.0228 min?1). According to the results of various experiments, massive oxygen vacancies on P–Fe2MnO4 alter its charge balance and facilitate the electron transfer process named adjacent transfer (direct electron capture by adsorbed PMS from adjacent TCE). Mn(III) is the main adsorption site for PMS, and the hydroxyl groups on the catalyst (Fe sites of P–Fe2MnO4, Si and Al sites of bentonite) can also offer binding sites for PMS. The hydrogen-bonded PMS on Fe(III) and Mn(III) sites will subsequently accept the discharged electrons to generate free radicals and high-valent metal species. Meanwhile, electron loss of HSO5? that chemically bonded to hydroxyl groups on bentonite will generate SO5??, which will further produce 1O2 through self-bonding. the active species on the catalyst surface contribute 65% of TCE degradation in the heterogeneous catalytic oxidation system. ? 2024 Elsevier Ltd