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<p>Photocatalysis has been extensively applied in organic pollutant degradation, and the key focus is on developing efficient and sustainable photocatalysts nowadays. In this work, Co<sub>9</sub>S<sub>8</sub>/Cd<sub>0.5</sub>Zn<sub>0.5</sub>S (CS/CZS) heterojunction photocatalysts were prepared by the hydrothermal method, and their photocatalytic activity was evaluated by the degradation of rhodamine B (RhB) under visible-light irradiation. Compared with pristine Co<sub>9</sub>S<sub>8</sub> and Cd<sub>0.5</sub>Zn<sub>0.5</sub>S, CS/CZS heterojunction materials demonstrated better photocatalytic activity. The optimized CS/CZS-2 sample achieved 94% degradation efficiency of RhB under visible-light irradiation within 18&#xa0;min. Active species trapping experiments revealed that ·O<sub>2</sub><sup>−</sup> and h<sup>+</sup> were the main active substances in the photocatalytic degradation process of RhB. The excellent photocatalytic degradation performance can be attributed to the formation of type-II heterojunction between Co<sub>9</sub>S<sub>8</sub> and Cd<sub>0.5</sub>Zn<sub>0.5</sub>S with intimate contact interface, which is conducive to the separation and migration of photogenerated carriers. This study introduces a promising strategy for the design and development of type-II heterojunction photocatalysts specifically aimed at wastewater purification.</p>

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Construction of Co9S8/Cd0.5Zn0.5S heterojunction photocatalysts with highly efficient photocatalytic activity

  • 期刊论文

  • 发表日期：

    2025年3月25日

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  • Jinpeng Du,
  • Meng Lan,
  • Yulong Xiang,
  • Xiaoli Dong,
  • Nan Zheng,
  • Yu Wang

摘要

Photocatalysis has been extensively applied in organic pollutant degradation, and the key focus is on developing efficient and sustainable photocatalysts nowadays. In this work, Co9S8/Cd0.5Zn0.5S (CS/CZS) heterojunction photocatalysts were prepared by the hydrothermal method, and their photocatalytic activity was evaluated by the degradation of rhodamine B (RhB) under visible-light irradiation. Compared with pristine Co9S8 and Cd0.5Zn0.5S, CS/CZS heterojunction materials demonstrated better photocatalytic activity. The optimized CS/CZS-2 sample achieved 94% degradation efficiency of RhB under visible-light irradiation within 18 min. Active species trapping experiments revealed that ·O2− and h+ were the main active substances in the photocatalytic degradation process of RhB. The excellent photocatalytic degradation performance can be attributed to the formation of type-II heterojunction between Co9S8 and Cd0.5Zn0.5S with intimate contact interface, which is conducive to the separation and migration of photogenerated carriers. This study introduces a promising strategy for the design and development of type-II heterojunction photocatalysts specifically aimed at wastewater purification.