Metal Borides as Excellent Co-Catalysts for Boosted and Long-Lasting Fenton-like Reaction: Dual Co-Catalytic Centers of Metal and Boron

Shuang Meng; Minglu Sun; Peng Zhang

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Metal Borides as Excellent Co-Catalysts for Boosted and Long-Lasting Fenton-like Reaction: Dual Co-Catalytic Centers of Metal and Boron

机译：Metal Borides as Excellent Co-Catalysts for Boosted and Long-Lasting Fenton-like Reaction: Dual Co-Catalytic Centers of Metal and Boron

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摘要

The continuous electron supply for oxidant decomposition-induced reactive oxygen species (ROS) generation is the main contributor for the long-standing micropollutant oxidation in the iron-based advanced oxidation processes (AOPs). Herein, as a new class of co-catalysts, metal borides with dual active sites and preeminent conductive performance can effectively overcome the inherent drawback of Fenton-like reactions by steadily donating electrons to inactive Fe(III). Among the metal borides, tungsten boride (WB) exhibits a significant co-catalytic performance run ahead of common heterogeneous co-catalysts and exceptionally high stability. Based on qualitative and semiquantitative tests, the hydroxyl radical, sulfate radical, and iron(lV)-oxo complex are all produced in the WB/Fe(lll)/PDS system and Fe(lV)-induced methyl phenyl sulfoxide decomposition is up to 72. Moreover, the production efficiency of ROS and relative proportions of radical and nonradical pathways change with various experimental conditions (dosages of PDS, WB, and solution pH) and water matrices. The rate-determining step of Fe(II) regeneration is greatly accelerated resulting from the synergetic effect between exposed metallic reactive sites and nonmetallic boron with reductive properties of WB. In addition, the self-dissolution of surface tungsten oxide and boron oxide leads to a renovated surface for sustainable Fe(IIl) reduction in long-term operations. Our discovery provides an efficient and sustainable strategy in the field of enhanced AOPs for water remediation.

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《Environmental Science & Technology: ES&T》 |2023年第33期|12534-12545|共12页
作者
Shuang Meng; Minglu Sun; Peng Zhang;
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作者单位

State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and Environment and Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China;

State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment and Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
metal boride; Fenton-like reaction; Fe(III)'/Fe(II) circulation; radical and nonradical pathways; water remediation;

Metal Borides as Excellent Co-Catalysts for Boosted and Long-Lasting Fenton-like Reaction: Dual Co-Catalytic Centers of Metal and Boron

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