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Constructing String-Cage Structure of α-MnO2@CoS2 Photoelectrocatalyst for Efficient Detoxification Sulfonamides Wastewater
  • Hongchao Ma 1, †,   
  • Yan Chen 1, †,   
  • Huizhen Jin 1, 2, †,   
  • Xinyue Wang 3, *,   
  • Guowen Wang 1,   
  • Yinghuan Fu 1,   
  • Pengyuan Wang 1,   
  • Vadivel Subramaniam 4,   
  • Krishnamoorthy Ramachandran 5,   
  • Xinghui Liu 2, 6, 7, *

Received: 23 Mar 2025 | Revised: 23 Apr 2025 | Accepted: 03 Jun 2025 | Published: 27 Jun 2025

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@CoS2 photoelectrode 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@CoS2 was 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.

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DOI
10.53941/see.2025.100006
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Volume 2, Issue 2
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Ma, H.; Chen, Y.; Jin, H.; Wang, X.; Wang, G.; Fu, Y.; Wang, P.; Subramaniam, V.; Ramachandran, K.; Liu, X. Constructing String-Cage Structure of α-MnO2@CoS2 Photoelectrocatalyst for Efficient Detoxification Sulfonamides Wastewater. Science for Energy and Environment 2025, 2 (2), 6. https://doi.org/10.53941/see.2025.100006.
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