Citation: Cailiang Yue, Nan Sun, Yixing Qiu, Linlin Zhu, Zhiling Du, Fuqiang Liu. A direct Z-scheme 0D α-Fe₂O₃/TiO₂ heterojunction for enhanced photo-Fenton activity with low H₂O₂ consumption[J]. Chinese Chemical Letters, ;2024, 35(12): 109698. doi: 10.1016/j.cclet.2024.109698 shu

A direct Z-scheme 0D α-Fe₂O₃/TiO₂ heterojunction for enhanced photo-Fenton activity with low H₂O₂ consumption

State Key Laboratory of Pollution and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China

lfq@nju.edu.cn

Received Date: 18 November 2023
Revised Date: 26 February 2024
Accepted Date: 27 February 2024
Available Online: 1 March 2024

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The insufficient F(III)/Fe(II) cycling rate resulted from high combination of photogenerated carriers severely hinders the photo-Fenton activity. In this work, 0 dimensional α-Fe₂O₃ nanoclusters decorated TiO₂ heterojunction (FT-x) was prepared via in-situ phase transformation strategy. FT-200 exhibited the optimal photo-Fenton activity for 2,4-dichlorophenol degradation with the kinetic rate constant reaching 1.0806 min⁻¹ under low H₂O₂ dosage (1 mmol/L), which was 126.1 and 202.8 times higher than that of TiO₂ and α-Fe₂O₃. Radical quenching experiments and electron spin resonance spectra proved that ·OH was the leading reactive specie. The enhanced photo-Fenton activity was attributed to the accelerated F(III)/Fe(II) cycling rate induced by the direct Z-Scheme charge transfer mechanism. Benefiting from the abundant ·OH production, the dechlorinate ratios and mineralization ratios of multiple chlorophenol pollutants (2,4-dichlorophenol, 4-chlorophenol, 2,4,6-trichlorophenol) all exceeded 98%. The biotoxicity of chlorophenol wastewater was greatly reduced after the treatment by Light/H₂O₂/FT-200 system. Overall, this work constructed a low-cost and highly efficient photo-Fenton system for refractory organic wastewater treatment.
- Photo-Fenton,
- Z-scheme heterojunction,
- Chlorophenol,
- α-Fe₂O₃,
- TiO₂
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A direct Z-scheme 0D α-Fe2O3/TiO2 heterojunction for enhanced photo-Fenton activity with low H2O2 consumption

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通讯作者: 陈斌, bchen63@163.com

A direct Z-scheme 0D α-Fe₂O₃/TiO₂ heterojunction for enhanced photo-Fenton activity with low H₂O₂ consumption