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Enhanced Visible-Light Photocatalytic Degradation of Antibiotics by MoS₂-Modified U-g-C₃N₄/T-g-C₃N₄ Isotypic Heterojunction

Hongjin Liu

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

E-mail Address: 1074731932@qq.com

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Yu Wang

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

E-mail Address: 1458952501@qq.com

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Jun Lv

http://orcid.org/0000-0001-9438-7581

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei 230009, P. R. China

E-mail Address: lvjun117@126.com

Corresponding authors.

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Guangqing Xu

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei 230009, P. R. China

E-mail Address: gqxu1979@hfut.edu.cn

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Xinyi Zhang

School of Chemistry, Monash University, Clayton, Victoria 3800, Australia

E-mail Address: xinyi.zhang@monash.edu

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, and

Yucheng Wu

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China

Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei 230009, P. R. China

E-mail Address: ycwu@hfut.edu.cn

Corresponding authors.

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https://doi.org/10.1142/S179329201950111XCited by:4 (Source: Crossref)

Abstract

Based on U-g-C₃N₄ (U-gCN) and T-g-C₃N₄ (T-gCN) prepared with urea and thiourea as raw materials, respectively, a visible-light-driven MoS₂-modified U-gCN/T-gCN/MoS₂ (UTM) ternary heterojunction photocatalyst was successfully prepared using a sonication and bathing method. The photocatalytic activity of as-prepared photocatalyst was evaluated through the degradation of tetracycline hydrochloride (TC) and Rhodamine B (RhB) under the visible light irradiation. The UTM ternary heterojunction showed remarkably enhanced photocatalytic activity. For the degradation of TC and RhB, the degradation rates of 93.9% and 99.9% have been achieved after being irradiated under visible light for 2h and 1h, respectively. The enhanced photocatalytic performance can be ascribed to the role of loaded MoS₂ cocatalyst and the well-formed interfaces between U-gCN and T-gCN, which not only enhance the light absorption, but also accelerate the separation and transfer of photogenerated electron–hole pairs. Furthermore, UTM ternary heterojunction has excellent recyclability and chemical stability. The photodegradation rates of 89.9% and 96.78% of TC and RhB have been obtained, respectively, after being reused for five times. Sacrificial agent tests demonstrate that $•$ $O_{2}^{-}$ is the major reactive species in the photocatalytic reaction system.

Keywords:

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