Highly efficient pollutants removal over Mo/Mo2C/CoAl-LDH heterostructure: photo-chemical co-driven peroxymonosulfate activation and singlet oxygen-dominated oxidative decomposition

被引：18
作者：
Fang, Hongjun [1 ]
Ding, Jie [1 ]
Feng, Xinzhen [1 ]
Ji, Weijie [1 ]
Au, Chak-Tong [2 ]
机构：
[1] Nanjing Univ, Sch Chem & Chem Engn, Key Lab Mesoscop Chem, MOE, Nanjing 210023, Peoples R China
[2] Hong Kong Baptist Univ, Dept Chem, Hong Kong, Peoples R China
来源：
JOURNAL OF WATER PROCESS ENGINEERING | 2023年 / 51卷
关键词：
Mo; Mo2C; CoAl-LDH; Peroxymonosulfate activation; Photo-chemical catalysis; Pollutants removal; GRAPHITIC CARBON NITRIDE; CHARGE SEPARATION; HETEROJUNCTION; PHOTOCATALYST; DEGRADATION; NANOSHEET;
D O I：
10.1016/j.jwpe.2022.103372
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Novel Mo/Mo2C/CoAl-LDH (CoAl layered double hydroxide) photocatalysts were fabricated through a hydro-thermal route and applied for efficient PMS activation and typical pollutants (tetracycline/TC, ciprofloxacin/CIP, methylene blue/MB, congo red/CR and rhodamine B/RhB) degradation. Specifically, tetracycline removal effi-ciency of 99 % (TC, 20 mg/L) with a TOC mineralization efficiency of 65 % was achieved by the Mo/Mo2C/CoAl-LDH/PMS/Vis system within 4 min-reaction, and the obtained reaction rate constant was 5.5 and 41.5 times greater than that of CoAl-LDH/PMS/Vis and Mo/Mo2C/PMS/Vis system, respectively. The exceptional perfor-mance over this joint system was mainly attributed to the synergism of the Mo-Co dual active components and the involved photocatalysis. The quenching/ESR investigations clearly demonstrated that all of the generated species contributed to TC degradation, and among them the singlet oxygen showed the greatest impact. The toxicity assessment suggested that most of degraded intermediates become more eco-friendly to the environment. Moreover, the involved reaction mechanism and degradation pathways of TC were proposed and discussed in detail. This work provides a promising strategy for PMS activation and environmental purification through an integrated photo-chemical catalysis.
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页数：14
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