Citation: Lu Zhang, Baohua Wang, Wei Yang, Lunan Ju, Zihan Fu, Lei Zhao, Yunqi Jiang, Hongyan Wang, Xiansheng Wang, Cong Lyu. CoOOH@COFs S−scheme heterojunction for efficient triclosan degradation in photocatalytic-peroxymonosulfate activation system: Enhanced interfacial electron transfer mechanism[J]. Chinese Chemical Letters, ;2026, 37(1): 111142. doi: 10.1016/j.cclet.2025.111142 shu

CoOOH@COFs S−scheme heterojunction for efficient triclosan degradation in photocatalytic-peroxymonosulfate activation system: Enhanced interfacial electron transfer mechanism

Lu Zhang ^{a, b} ,
Baohua Wang ^c ,
Wei Yang ^d ,
Lunan Ju ^{a, b} ,
Zihan Fu ^{a, b} ,
Lei Zhao ^e ,
Yunqi Jiang ^f ,
Hongyan Wang ^g ,
Xiansheng Wang ^{a, b, *,} ,
Cong Lyu ^{a, b, *,}

a.
Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130026, China
b.
Jilin Provincial Key Laboratory of Water Resources and Environment, Jilin University, Changchun 130026, China
c.
Shen Zhen LiYuan Water Design & Consultation Co. Ltd., Shenzhen 518000, China
d.
Water Conservancy Project Construction Management Station under Songliao River Water Resources Commission of Ministry of Water Resources, Changchun 130021, China
e.
Department of Agriculture and Rural Affairs of Jilin Province, Changchun 130051, China
f.
Department of Environmental Futures: Sustainable Systems MSc, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
g.
Songyuan City Ecological Environment Monitoring Center, Songyuan 138001, China

wxs@jlu.edu.cn

lvcong@jlu.edu.cn

Received Date: 29 October 2024
Revised Date: 17 January 2025
Accepted Date: 25 March 2025
Available Online: 26 March 2025

Figures(6)

Triclosan (TCS) poses harmful risks to ecosystems and human health owing to its endocrine-disrupting effects. Therefore, developing an efficient and sustainable technology to degrade TCS is urgently needed. Herein, cobalt oxyhydroxide @covalent organic frameworks (CoOOH@COFs) S−scheme heterojunction was synthesized, which combined the visible-light-driven photocatalysis and peroxymonosulfate (PMS) activation to synergistically generate abundant reactive oxygen species (ROSs) for TCS degradation. The degradation efficiency of TCS reached 100% within 8 min in the Vis-CoOOH@COFs/PMS system, and the reaction rate constant was 0.456 min⁻¹, which was nearly 1.90 and 2.85 times that of single CoOOH and COFs, and 2.36 times that under dark condition, respectively. The density functional theory (DFT) calculations confirmed the energy band bending of CoOOH@COFs and S-scheme charge transport from COFs to CoOOH. Both experimental and theoretical analyses indicated that CoOOH@COFs in photocatalytic-PMS activation systems synergistically facilitated photo-generated carrier separation, enhanced interfacial electron transfer, accelerated PMS activation, and generated multiple ROSs. In particular, photogenerated electrons (e⁻) accelerated the Co(Ⅲ)/Co(Ⅱ) redox cycle, while the PMS captured the e⁻, which significantly decreased the charge combination of CoOOH@COFs. Radicals (O₂^•−, ^•OH, and SO₄^•−) and non-radicals (such as ¹O₂, h⁺, and e⁻) were both presented in the Vis-CoOOH@COFs/PMS system, with O₂⁻ playing a dominant role in TCS degradation. Furthermore, the pathway of TCS degradation and toxicity of intermediates were explored by DFT calculation and transformation product identification. Importantly, the environmentally friendly CoOOH@COFs S−scheme heterojunction exhibited excellent stability and reusability. In conclusion, this study innovatively designed an S−scheme heterojunction in the photocatalytic-PMS activation system, providing guidance and theoretical support for efficient and eco-friendly wastewater treatment.
- Covalent organic frameworks,
- Cobalt oxyhydroxide,
- S−scheme heterojunction,
- Interfacial electron transfer,
- Peroxymonosulfate activation
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