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<p>2,4,6-Trinitrotoluene (TNT) wastewater poses a significant challenge to global environmental management due to its high toxicity, persistence, and carcinogenicity. Existing chemical and biological treatments often suffer from incomplete degradation and complex byproducts. This work demonstrates a hydrothermal-derived CdS/BiPO<sub>4</sub> composite with Z-scheme charge transfer architecture. The structural and photoelectrochemical properties were systematically characterized by XRD, XPS, and radical trapping experiments. The optimized CSB0.2 composite achieved 95.2% TNT degradation within 80&#xa0;min under xenon lamp irradiation, with a rate constant 3.18 times higher than pure CdS. Mechanistic studies revealed that conduction band electrons in CdS generated superoxide radicals through a Z-scheme transfer pathway, driving TNT denitration and ring-opening degradation. XPS binding energy shifts confirmed interfacial charge redistribution. This study provides an efficient photocatalyst design strategy for nitroaromatic pollutant remediation and offers valuable insights for environmental catalysis and wastewater treatment technologies.</p>

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Construction of a Z-scheme CdS/BiPO4 heterojunction for enhanced photocatalytic degradation of trinitrotoluene wastewater

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Xingxi Du,
  • Hao Chen,
  • Xiaoyue Zhao,
  • Junle Hu,
  • Zhensheng Yan,
  • Junyuan Mu,
  • Zhipeng Li,
  • Shuangqi Hu,
  • Wenhui Liu

摘要

2,4,6-Trinitrotoluene (TNT) wastewater poses a significant challenge to global environmental management due to its high toxicity, persistence, and carcinogenicity. Existing chemical and biological treatments often suffer from incomplete degradation and complex byproducts. This work demonstrates a hydrothermal-derived CdS/BiPO4 composite with Z-scheme charge transfer architecture. The structural and photoelectrochemical properties were systematically characterized by XRD, XPS, and radical trapping experiments. The optimized CSB0.2 composite achieved 95.2% TNT degradation within 80 min under xenon lamp irradiation, with a rate constant 3.18 times higher than pure CdS. Mechanistic studies revealed that conduction band electrons in CdS generated superoxide radicals through a Z-scheme transfer pathway, driving TNT denitration and ring-opening degradation. XPS binding energy shifts confirmed interfacial charge redistribution. This study provides an efficient photocatalyst design strategy for nitroaromatic pollutant remediation and offers valuable insights for environmental catalysis and wastewater treatment technologies.