Cu-Fe LDHs/Bi2WO6 composite for superior photo-Fenton Rhodamine B removal through combination of photogenerated electrons and multivalent bimetal redox for accelerating Fe3+/Fe2+ cycles

被引：22
作者：
Ji, Yun [1 ,2 ,3 ]
Song, Zhelin [1 ,2 ,3 ]
Xu, Yu [1 ,2 ,3 ]
Zhang, Yanlin [1 ,2 ,3 ]
机构：
[1] South China Normal Univ, Sch Environm, Guangzhou 510006, Peoples R China
[2] South China Normal Univ, Minist Educ, Guangdong Prov Key Lab Chem Pollut & Environm Saf, Guangzhou 510006, Peoples R China
[3] South China Normal Univ, Minist Educ, Key Lab Theoret Chem Environm, Guangzhou 510006, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 925卷
基金：
中国国家自然科学基金;
关键词：
Photo-Fenton process; Layered double hydroxides; Bismuth tungstate; Degradation mechanism; LIGHT PHOTOCATALYTIC ACTIVITY; LAYERED DOUBLE HYDROXIDES; BI2WO6; NANOFLOWERS; DEGRADATION; OXIDATION; MECHANISMS; WATER; HETEROJUNCTION; NANOPARTICLES; ANTIBIOTICS;
D O I：
10.1016/j.jallcom.2022.166655
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, typical refractory pollutant Rhodamine B (RhB) was effectively degraded by Cu-Fe LDHs/ Bi2WO6 composite in the photo-Fenton process. The hydrothermal synthesis of Cu-Fe LDHs/Bi2WO6 composite with ethylene glycol as reductant created the multivalent coexistence of the same metal element to achieve a self-circle redox reaction between metals. The photo-Fenton process by Cu-Fe LDHs/Bi2WO6 incredibly eliminated the limitation of strong acidic pH value applied in the Fenton process. center dot OH generated by Cu-Fe LDHs/Bi2WO6 was 5 times that of Cu-Fe LDHs during the photo-Fenton process. The complete degradation of RhB in the photo-Fenton process under the optimal conditions of initial pH= 6, 5 mmol/L of H2O2, and 1 g/L of Cu-Fe LDHs/Bi2WO6 dosage was far more than 46% of RhB degradation in the photocatalytic process and 76% of RhB degradation in the Fenton process. Cu-Fe LDHs/Bi2WO6 composite exhibited the excellent redox ability, electron transfer ability and reusability during the photo-Fenton process. The acceleration of Fe3+/Fe2+ cycles in the Cu-Fe LDHs/Bi2WO6/H2O2/Vis systemwas mainly ascribable to the combination of efficient transfer of photogenerated electrons and self-circle redox of Fe3+/Cu+. It is expected for the promising application of multivalent bimetallic photo-Fenton catalysts and rendering enlightenments for photo-Fenton catalytic oxidation reaction. (c) 2022 Elsevier B.V. All rights reserved.
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页数：12
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