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Article

Innovative Z-Scheme Heterojunction Photocatalyst ZnBiGdO4/SnS2 for Photocatalytic Degradation of Tinidazole Under Visible Light Irradiation

by
Jingfei Luan
1,2,*,
Boyang Liu
1,
Liang Hao
1,
Wenchen Han
1 and
Anan Liu
1
1
School of Physics, Changchun Normal University, Changchun 130032, China
2
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2025, 26(17), 8366; https://doi.org/10.3390/ijms26178366 (registering DOI)
Submission received: 19 July 2025 / Revised: 18 August 2025 / Accepted: 25 August 2025 / Published: 28 August 2025
(This article belongs to the Special Issue Latest Research in Photocatalysis)

Abstract

A high-performance Z-scheme heterojunction photocatalytic compound, ZnBiGdO4/SnS2 (ZS), was prepared for the first time using a microwave-assisted solvothermal method. ZS significantly improved the separation efficiency of photoinduced carriers and effectively broadened the response range to visible light through the unique mechanism of the Z-type heterojunction. Therefore, ZS exhibited an excellent photocatalytic performance during the degradation process of tinidazole (TNZ). Specifically, the removal rate of TNZ by ZS reached 99.63%, and the removal rate of total organic carbon (TOC) reached 98.37% with ZS as catalyst under visible light irradiation (VLIN). Compared to other photocatalysts, the photocatalytic performance of ZS was significantly better than that of ZnBiGdO4, SnS2, or N-doped TiO2 (N-T). The removal rate of TNZ by ZS was 1.12 times, 1.26 times, or 2.41 times higher than that by ZnBiGdO4, SnS2, or N-T, respectively. The mineralization efficiency of TNZ for TOC with ZS as a catalyst was 1.15 times, 1.28 times, or 2.57 times higher than that with ZnBiGdO4, SnS2, or N-T as a catalyst, respectively. Free radical scavenging experiments and the electron paramagnetic resonance experiments confirmed that ZS could generate multiple reactive species such as hydroxyl radicals (•OH), superoxide anions (•O2), and photoinduced holes (h+) during the photocatalytic degradation process of TNZ. The photocatalytic degradation performance of ZS on TNZ under VLIN was evaluated, concurrently, the reliability, reproducibility, and stability of ZS were verified by five cycle experiments. This study explored the degradation mechanism and degradation pathway of TNZ with ZS as a catalyst under VLIN. This study not only provides new ideas for the design and preparation of Z-type heterojunction photocatalysts but also lays an important foundation for the development of efficient environmental remediation technologies for TNZ pollution.
Keywords: heterojunction photocatalyst ZnBiGdO4/SnS2; Z-type mechanism; tinidazole; photocatalytic degradation efficiency; degradation pathway; visible light irradiation heterojunction photocatalyst ZnBiGdO4/SnS2; Z-type mechanism; tinidazole; photocatalytic degradation efficiency; degradation pathway; visible light irradiation

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MDPI and ACS Style

Luan, J.; Liu, B.; Hao, L.; Han, W.; Liu, A. Innovative Z-Scheme Heterojunction Photocatalyst ZnBiGdO4/SnS2 for Photocatalytic Degradation of Tinidazole Under Visible Light Irradiation. Int. J. Mol. Sci. 2025, 26, 8366. https://doi.org/10.3390/ijms26178366

AMA Style

Luan J, Liu B, Hao L, Han W, Liu A. Innovative Z-Scheme Heterojunction Photocatalyst ZnBiGdO4/SnS2 for Photocatalytic Degradation of Tinidazole Under Visible Light Irradiation. International Journal of Molecular Sciences. 2025; 26(17):8366. https://doi.org/10.3390/ijms26178366

Chicago/Turabian Style

Luan, Jingfei, Boyang Liu, Liang Hao, Wenchen Han, and Anan Liu. 2025. "Innovative Z-Scheme Heterojunction Photocatalyst ZnBiGdO4/SnS2 for Photocatalytic Degradation of Tinidazole Under Visible Light Irradiation" International Journal of Molecular Sciences 26, no. 17: 8366. https://doi.org/10.3390/ijms26178366

APA Style

Luan, J., Liu, B., Hao, L., Han, W., & Liu, A. (2025). Innovative Z-Scheme Heterojunction Photocatalyst ZnBiGdO4/SnS2 for Photocatalytic Degradation of Tinidazole Under Visible Light Irradiation. International Journal of Molecular Sciences, 26(17), 8366. https://doi.org/10.3390/ijms26178366

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