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Review Article | Open Access

Advances in dual-functional photocatalysis for simultaneous reduction of hexavalent chromium and oxidation of organics in wastewater

Tao Zhanga, Pengfei Wangb, Yi Lic, Yueping Baoa(), Teik-Thye Limd, Sihui Zhana()
MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, PR China
School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300130, PR China
Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry, School of Science, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072, PR China
School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, 639798, Singapore
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HIGHLIGHTS

● The basic principles of dual-functional photocatalysis in aqueous phase are discussed.

● Recent advances in dual-functional photocatalytic simultaneous removal of Cr(Ⅵ) and organics are summarized.

● Recent advances in TiO2-based, Bi-based and g-C3N4-based dual-functional photocatalysts are summarized.

● Key scientific problems and outlooks in dual-functional photocatalysis are outlined.

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Abstract

The solar-driven photocatalytic process has been evolved as a promising technology for both hexavalent chromium reduction and organic pollutants oxidation. Although both reactions are based on the same principle of photoinduced interfacial charge transfer, different catalysts and reaction conditions are required in two processes. This review revealed the scientific advances in dual-functional photocatalytic processes that enable simultaneous hexavalent chromium reduction and organics oxidation. Firstly, the basic principles of dual-functional photocatalysis are briefly discussed whereby the key concept of the system is the simultaneous oxidation of organic pollutants via photogenerated holes and reduction of hexavalent chromium via photogenerated electrons. Then, advances in dual-functional photocatalysis for the simultaneous removal of hexavalent chromium and organics are presented and discussed in terms of catalysts classification, including TiO2-based, bismuth-based and g-C3N4-based catalysts. Finally, the prospects, challenges and new perspectives of feasible solutions for dual-functional photocatalytic catalysts design are presented. Overall, this paper provides new insights on the modulation strategies and conformational relationships of dual-functional materials for researchers in the field of photocatalysis, which is beneficial for the practical applications of dual-functional materials in environmental remediation.

Keywords

Dual-functional photocatalysisCr(Ⅵ) reductionOrganic pollutants oxidationSimultaneous removalWastewater treatment

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Environmental Functional Materials
Volume 2 Issue 1,
March 2023
Pages 58-69
DOI: 10.1016/j.efmat.2023.05.001
Cite this article:
Zhang T, Wang P, Li Y, et al. Advances in dual-functional photocatalysis for simultaneous reduction of hexavalent chromium and oxidation of organics in wastewater. Environmental Functional Materials, 2023, 2(1): 58-69. https://doi.org/10.1016/j.efmat.2023.05.001
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