Citation: Guie Li, Chunyan Yang, Qiu Yang, Qingzhu Zheng, Menghan Li, Jianhua Qu, Guangshan Zhang. A magnetically recyclable CoFe₂O₄/BiOBr S-scheme heterojunction for efficient photocatalytic degradation of diuron: Performance, durability and mechanism exploration[J]. Chinese Chemical Letters, ;2026, 37(1): 111207. doi: 10.1016/j.cclet.2025.111207 shu

A magnetically recyclable CoFe₂O₄/BiOBr S-scheme heterojunction for efficient photocatalytic degradation of diuron: Performance, durability and mechanism exploration

Guie Li ^a ,
Chunyan Yang ^{b, *,} ,
Qiu Yang ^a ,
Qingzhu Zheng ^a ,
Menghan Li ^a ,
Jianhua Qu ^c ,
Guangshan Zhang ^{a, *,}

a.
Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
b.
College of Architecture and Environment, Sichuan University, Chengdu 610207, China
c.
School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China

cyyanghit@163.com

gszhang@qau.edu.cn

Received Date: 11 December 2024
Revised Date: 23 March 2025
Accepted Date: 14 April 2025
Available Online: 18 April 2025

Figures(13)

The excessive use of pesticides has exacerbated environmental pollution due to herbicide residues, while their persistent toxicity poses serious challenges to global ecological security. A magnetically recyclable CoFe₂O₄/BiOBr S-scheme heterojunctions was prepared by microwave-assisted co-precipitation method for photocatalytic degradation of Diuron (DUR) in water. The formation of S-scheme heterojunction enhances electron transfer and charge separation, which was demonstrated by free radical trapping, electrochemical experiments, and DFT calculations. The magnetic CoFe₂O₄/BiOBr catalysts can achieve 99.9% removal of diuron in 50 min under visible light irradiation. Furthermore, the system maintains stable performance across a broad pH range (3–9), enabling adaptation to diverse water environments, effective elimination of multiple pollutants, and strong resistance to ionic interference. Using magnetic recovery, CoFe₂O₄/BiOBr exhibits a high removal rate of 99% and a markedly low ion leaching rate (< 20 µg/L) after six cycles photocatalytic process, confirming its excellent stability and durability. According to HPLC-QTOF-MS and DFT calculation, the main ways of DUR degradation include dechlorinated hydroxylation, dealkylation and hydroxylation of aromatic ring and side chain. Toxicity analysis showed that the toxicity of the intermediates generated during degradation was generally lower than that of DUR. The magnetic CoFe₂O₄/BiOBr S-scheme heterojunction developed in this study exhibits excellent photocatalytic performance, high applicability, good stability, and durability, providing an effective magnetic for the removal of refractory pollutants.
- CoFe₂O₄/BiOBr,
- Diuron,
- Durability,
- DFT calculations,
- Photocatalytic degradation
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A magnetically recyclable CoFe2O4/BiOBr S-scheme heterojunction for efficient photocatalytic degradation of diuron: Performance, durability and mechanism exploration

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通讯作者: 陈斌, bchen63@163.com

A magnetically recyclable CoFe₂O₄/BiOBr S-scheme heterojunction for efficient photocatalytic degradation of diuron: Performance, durability and mechanism exploration