Constructing String-Cage Structure of α-MnO2@CoS2 Photoelectrocatalyst for Efficient Detoxification Sulfonamides Wastewater

Hongchao Ma; Yan Chen; Huizhen Jin; Xinyue Wang; Guowen Wang; Yinghuan Fu; Pengyuan Wang; Vadivel Subramaniam; Krishnamoorthy Ramachandran; Xinghui Liu

doi:10.53941/see.2025.100006

Science for Energy and Environment ›› 2025, Vol. 2 ›› Issue (2) :6 DOI: 10.53941/see.2025.100006

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research-article

Constructing String-Cage Structure of α-MnO₂@CoS₂ Photoelectrocatalyst for Efficient Detoxification Sulfonamides Wastewater

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¹ School of Light Industry & Chemical Engineering, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, China

² Science and Technology on Aerospace Chemical Power Laboratory, Hubei Institute of Aerospace Chemotechnology, Xiangyang 441003, China

³ School of Textile and Material Engineering, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, China

⁴ Department of Physics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Thandalam, Chennai 602105, Tamil Nadu, India

⁵ Department of Physics, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Vadapalani Campus, Chennai 600026, Tamilnadu, India

⁶ Division of Research and Development, Lovely Professional University, Phagwara 144401, Punjab, India

⁷ Hubei Provincial Key Laboratory of Artificial Quantum Two-Dimensional Materials, Hubei University of Technology, Wuhan 430068, P.R. China.

^* wangxyyyy@163.com (X.W.);

liuxinghui119@gmail.com (X.L.)

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Abstract

Constructing high-efficiency heterostructured photocatalysts for antibiotic degradation is critical and challenging. Herein, a “pearl necklace” α-MnO₂@CoS₂ photoelectrode was prepared via a continuous hydrothermal process. The as-obtained photoelectrode comprised overlong α-MnO₂ nanowires (as leading wire) and CoS₂ nanocages (as decorations) derived from ZIF-67 precursor. The contrivable α-MnO₂@CoS₂photoelectrode exhibited lower charge transfer resistance and higher carrier separation efficiency than single α-MnO₂. The α-MnO₂@CoS₂ provided a heterostructured interface with fast carrier transfer, where α-MnO₂ nanowire played the carrier transfer channel, and the CoS₂ “nanocages” can effectively increase the contact area between the catalyst and the pollutants. Meanwhile, the stable p-n junction with the internal electric field can be formed in the synthesized α-MnO₂@CoS₂ composite to avoid the destruction of heterogeneous junctions and thus maintain stability. As a result, the α-MnO₂@CoS₂-0.2 had the highest PEC efficiency with a degradation rate of 98.95% for sulfonamides (SMX) within 50 min among prepared catalysts. The charge density difference of α-MnO₂@CoS₂was performed to investigate the strong interaction between α-MnO₂ and CoS₂. This study provides insights into the construction of nanomaterial structures and their applicability to photocatalytic degradation of target pollutants, which can be expanded for future cost-effective water purification applications.

Keywords

α-MnO₂ / CoS₂ / photoelectrocatalysis / sulfamethoxazole / p-n heterojunction

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Hongchao Ma, Yan Chen, Huizhen Jin, Xinyue Wang, Guowen Wang, Yinghuan Fu, Pengyuan Wang, Vadivel Subramaniam, Krishnamoorthy Ramachandran, Xinghui Liu. Constructing String-Cage Structure of α-MnO₂@CoS₂ Photoelectrocatalyst for Efficient Detoxification Sulfonamides Wastewater. Science for Energy and Environment, 2025, 2(2): 6 DOI:10.53941/see.2025.100006

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