A Z-scheme LaFeO3-CuFe2O4 composite for sulfate radical-based photocatalytic process: Synergistic effect and mechanism

doi:10.1016/j.cjche.2024.05.013

Chinese Journal of Chemical Engineering ›› 2024, Vol. 73 ›› Issue (9): 256-269.DOI: 10.1016/j.cjche.2024.05.013

A Z-scheme LaFeO₃-CuFe₂O₄ composite for sulfate radical-based photocatalytic process: Synergistic effect and mechanism

Wenwen Gao^1,2, Yuhuan Wang¹, Wang Li¹, Zhifang Zhang^1,3, Ting Su¹, Miao Mu^1,2, Ying Gong^1,2, Rui Dang^1,2, Rui Bai^1,2, E Zheng¹, Wei Zhao²

1. Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School Chemistry and Chemical Engineering, Yulin University, Yulin 71900, China;
2. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China;
3. High Value Utilization of Coal Based Semi-coke Derivatives of Shaanxi University Engineering Research Center, Yulin University, Yulin 71900, China

Received:2024-03-10 Revised:2024-05-17 Accepted:2024-05-20 Online:2024-06-08 Published:2024-11-21
Contact: Wei Zhao,E-mail:zhaow1965@163.com
Supported by:
This work was funded by the National Natural Science Foundation of China (52062047), the Innovation Capacity Support Plan of Shaanxi Province (2020TD-032), Yulin Science and Technology Plan (2019-81-1, CXY-2021-101-02 and 2023-CXY-154), Joint Fund of Clean Energy Innovation Institute of Chinese Academy of Sciences and Yulin University (YLUDNL202202) and Yulin University Science and Technology Plan (2020TZRC01).

A Z-scheme LaFeO₃-CuFe₂O₄ composite for sulfate radical-based photocatalytic process: Synergistic effect and mechanism

Wenwen Gao^1,2, Yuhuan Wang¹, Wang Li¹, Zhifang Zhang^1,3, Ting Su¹, Miao Mu^1,2, Ying Gong^1,2, Rui Dang^1,2, Rui Bai^1,2, E Zheng¹, Wei Zhao²

1. Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School Chemistry and Chemical Engineering, Yulin University, Yulin 71900, China;
2. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China;
3. High Value Utilization of Coal Based Semi-coke Derivatives of Shaanxi University Engineering Research Center, Yulin University, Yulin 71900, China

通讯作者: Wei Zhao,E-mail:zhaow1965@163.com
基金资助:
This work was funded by the National Natural Science Foundation of China (52062047), the Innovation Capacity Support Plan of Shaanxi Province (2020TD-032), Yulin Science and Technology Plan (2019-81-1, CXY-2021-101-02 and 2023-CXY-154), Joint Fund of Clean Energy Innovation Institute of Chinese Academy of Sciences and Yulin University (YLUDNL202202) and Yulin University Science and Technology Plan (2020TZRC01).

Abstract

Abstract: The sulfate radical-based photocatalytic process is supposed to be the most promising way to degrade organic pollutants. However, the development of a suitable and efficient photocatalyst is very challenging. The 40LaFeO₃-CuFe₂O₄ (40LFO-CFO) nanocomposite was constructed and its catalytic performance was studied using Rhodamine B (RhB) as the target pollutant. 40LFO-CFO exhibited excellent RhB degradation by the persulfate (PS)-assisted photocatalytic process compared to the pristine LFO and CFO. The degradation rate constant for RhB by 40LFO-CFO in the Vis/PS system was 2.22 h^-1 which is 3.04 times and 5.05 times higher than the pristine LFO (0.73 h^-1) and CFO (0.44 h^-1), respectively. Furthermore, the trapping experiments and EPR spectra proved that h⁺ plays a leading role in the bleaching of RhB for the 40LFO-CFO/PS/Vis system. The enhanced photocatalytic oxidation activity of 40LFO-CFO could be attributed to the unique charge carriers flow in 40LFO-CFO due to the Z-scheme and the cooperation effect between photocatalysis and PS activation. The recycle tests confessed the stability of 40LFO-CFO. Additionally, the intermediates and products of RhB are detected by liquid chromatography-mass spectrometry (LC-MS), and the photocatalytic degradation routes of RhB for the 40LFO-CFO/Vis/PS system were proposed. Moreover, the 40LFO-CFO nanocomposite has a superior catalytic performance for other organics, suggesting that it is a promising heterocatalyst because of its high catalytic activity and stability for the PS-assisted photocatalytic process.

Key words: Interfacial charge transfer, Sulfate radical-based photocatalytic process, Z-scheme electron transfer, Enhanced charge pair separation, Organic pollutants degradation

摘要： The sulfate radical-based photocatalytic process is supposed to be the most promising way to degrade organic pollutants. However, the development of a suitable and efficient photocatalyst is very challenging. The 40LaFeO₃-CuFe₂O₄ (40LFO-CFO) nanocomposite was constructed and its catalytic performance was studied using Rhodamine B (RhB) as the target pollutant. 40LFO-CFO exhibited excellent RhB degradation by the persulfate (PS)-assisted photocatalytic process compared to the pristine LFO and CFO. The degradation rate constant for RhB by 40LFO-CFO in the Vis/PS system was 2.22 h^-1 which is 3.04 times and 5.05 times higher than the pristine LFO (0.73 h^-1) and CFO (0.44 h^-1), respectively. Furthermore, the trapping experiments and EPR spectra proved that h⁺ plays a leading role in the bleaching of RhB for the 40LFO-CFO/PS/Vis system. The enhanced photocatalytic oxidation activity of 40LFO-CFO could be attributed to the unique charge carriers flow in 40LFO-CFO due to the Z-scheme and the cooperation effect between photocatalysis and PS activation. The recycle tests confessed the stability of 40LFO-CFO. Additionally, the intermediates and products of RhB are detected by liquid chromatography-mass spectrometry (LC-MS), and the photocatalytic degradation routes of RhB for the 40LFO-CFO/Vis/PS system were proposed. Moreover, the 40LFO-CFO nanocomposite has a superior catalytic performance for other organics, suggesting that it is a promising heterocatalyst because of its high catalytic activity and stability for the PS-assisted photocatalytic process.

关键词: Interfacial charge transfer, Sulfate radical-based photocatalytic process, Z-scheme electron transfer, Enhanced charge pair separation, Organic pollutants degradation

Wenwen Gao, Yuhuan Wang, Wang Li, Zhifang Zhang, Ting Su, Miao Mu, Ying Gong, Rui Dang, Rui Bai, E Zheng, Wei Zhao. A Z-scheme LaFeO₃-CuFe₂O₄ composite for sulfate radical-based photocatalytic process: Synergistic effect and mechanism[J]. Chinese Journal of Chemical Engineering, 2024, 73(9): 256-269.

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A Z-scheme LaFeO₃-CuFe₂O₄ composite for sulfate radical-based photocatalytic process: Synergistic effect and mechanism

A Z-scheme LaFeO₃-CuFe₂O₄ composite for sulfate radical-based photocatalytic process: Synergistic effect and mechanism

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