Surface modify BiOBr/Mn-Ti3C2Tx to enhance the carrier separation efficiency and weak electron utilization for photo-assisted peroxymonosulfate activation to degrade emerging contaminants

被引：17

作者：

Zuo, Shiyu ^{[1
]}

Huang, Shuhong ^{[1
]}

Wang, Yan ^{[1
,2
,5
]}

Wan, Jinquan ^{[1
,2
]}

Yan, Zhicheng ^{[1
]}

Ma, Yongwen ^{[1
,2
]}

Wang, Silong ^{[3
,4
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Peoples R China

[2] South China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510006, Peoples R China

[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] South China Univ Technol, Coll Environm & Energy, Guangzhou 510006, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 475卷

基金：

中国国家自然科学基金;

关键词：

Surface modification; Carrier separation; Electron utilization; Photo-assisted peroxymonosulfate activation; Emerging contaminants; HETEROJUNCTION; PERFORMANCE; PERSULFATE; OXIDATION; MXENE;

D O I：

10.1016/j.cej.2023.146230

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The low separation efficiency and light utilization of photogenerated carriers are one of the key problems in photocatalysis. This, Mn-Ti3C2Tx was prepared by surface modification of Ti3C2Tx, BiOBr/Mn-Ti3C2Tx composite photocatalysts were synthesized through in situ ion modification. The synergy of surface modification and builtin electric field improves carrier separation efficiency and weak electron utilization. This can promote electrocatalytic reduction of peroxymonosulfate (PMS) to produce SO4 center dot- and improve electron utilization. The various photovoltaic properties characterization found that BiOBr/Mn-Ti3C2Tx exhibited superior light capture ability and carrier separation efficiency compared to BiOBr/Ti3C2Tx, and thus had more efficient photocatalytic degradation performance, which was found to be increased from 90.88% to 98.29% using emerging contaminants as the target pollutant. Secondly, the migration path of carriers in BiOBr/Mn-Ti3C2Tx was analyzed by In Situ Irradiated X-Ray Photoelectron Spectroscopy (ISI-XPS) as well as the proposed mechanism of ciprofloxacin (CIP) degradation by BiOBr/Mn-Ti3C2Tx photo-assisted activation of PMS. The possible pathways of CIP degradation were further explored by liquid chromatograph mass spectrometer (LC-MS), revealing that the BiOBr/Mn-Ti3C2Tx photocatalytic degradation pathways. In this work, a strategy of surface modification and built-in electric field synergy is proposed to improve the photogenerated carrier separation and light utilization efficiency for enhancing the emerging contaminants removal.

引用

页数：10