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<p>Hexavalent chromium (Cr(VI)) is a highly toxic and carcinogenic contaminant that poses severe environmental and health hazards. Photocatalytic reduction using Cu<sub>2</sub>O-based composites has emerged as a promising approach for Cr(VI) detoxification due to Cu<sub>2</sub>O's visible light responsiveness, tunable band structure, and excellent redox properties. This mini-review provides an overview of recent advancements in Cu<sub>2</sub>O-based photocatalysts for Cr(VI) reduction, with a focus on environmental risks of chromium ions, a case study of Cr(VI) pollution, synthesis strategies of Cu<sub>2</sub>O-based photocatalysts, structural modifications, and photocatalytic mechanisms. Key factors influencing photocatalytic performance, including heterojunction formation, co-catalyst loading, charge separation efficiency, and reaction conditions, are critically examined. Additionally, the challenges associated with Cu<sub>2</sub>O-based photocatalysts, such as photo-corrosion and scalability limitations, are discussed along with potential strategies to overcome them. Finally, future research directions for enhancing Cu<sub>2</sub>O-based photocatalytic systems through material innovations and sustainable implementation are outlined. This review aims to provide valuable insights into the development of efficient and stable Cu<sub>2</sub>O-based photocatalysts for chromium remediation, contributing to cleaner and safer water resources.</p>

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Recent advances in Cu2O-based composites photocatalysts for chromium(VI) reduction: a mini review

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Jayaprakash Avinash,
  • Thangapandi Chellapandi,
  • Jagan Mohan,
  • Logesh Dhamotharan,
  • Vinusam Vinayagam,
  • S. P. Vijaya Chamundeeswari

摘要

Hexavalent chromium (Cr(VI)) is a highly toxic and carcinogenic contaminant that poses severe environmental and health hazards. Photocatalytic reduction using Cu2O-based composites has emerged as a promising approach for Cr(VI) detoxification due to Cu2O's visible light responsiveness, tunable band structure, and excellent redox properties. This mini-review provides an overview of recent advancements in Cu2O-based photocatalysts for Cr(VI) reduction, with a focus on environmental risks of chromium ions, a case study of Cr(VI) pollution, synthesis strategies of Cu2O-based photocatalysts, structural modifications, and photocatalytic mechanisms. Key factors influencing photocatalytic performance, including heterojunction formation, co-catalyst loading, charge separation efficiency, and reaction conditions, are critically examined. Additionally, the challenges associated with Cu2O-based photocatalysts, such as photo-corrosion and scalability limitations, are discussed along with potential strategies to overcome them. Finally, future research directions for enhancing Cu2O-based photocatalytic systems through material innovations and sustainable implementation are outlined. This review aims to provide valuable insights into the development of efficient and stable Cu2O-based photocatalysts for chromium remediation, contributing to cleaner and safer water resources.