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Metal sulphides and their heterojunctions for photocatalytic degradation of organic dyes-A comprehensive review

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Abstract

Water pollution caused by organic dyes is one of the greatest threats to the ecosystem. The removal of dyes from water has remained a challenge for scientists. Recently, metal sulphides have emerged as a potential candidate for water remediation applications. The efficient charge transportation, greater surface-active sites, and low bandgap of metal sulphides make them an excellent choice of semiconductor photocatalysts for degradation of dyes. This review summarises the potential application of metal sulphides and their heterojunctions for the photocatalytic degradation of organic dyes from wastewater. A detailed study has been presented on the synthesis, basics of photodegradation and heterojunctions and photocatalytic activity. The effect of the use of templates, doping agents, synthesis route, and various other factors affecting the photocatalytic activity of metal sulphides have been summarised in this review. The synthesis techniques, characterisation techniques, mechanism of degradation of organic dyes by Z-scheme heterojunction photocatalyst, reusability and stability of metal sulphides, and the scope of future research are also discussed. This study indicates that Scopus-based core gathered data could be used to give an objective overview of the global dye degradation research from 2008 to 2023 (15 years). All data (articles, authors, keywords, and publications) is compiled in the Scopus database. For the bibliometric study, 1962 papers relevant to dye photodegradation by sulfide-based photocatalysts were found, and this number rises yearly. A bibliometric analysis provides a 15-year evaluation of the state-of-the-art research on the impact of metal sulfide-based photocatalysts on the photodegradation of dyes.

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Acknowledgements

The authors are thankful to the Director, National Institute of Technology Silchar, for his help and continuous support for the preparation of the manuscript.

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Vishal Gadore, Soumya Ranjan Mishra, and Md. Ahmaruzzaman have equally contributed in conducting the literature review and compilation of the manuscript.

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Correspondence to Md. Ahmaruzzaman.

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Gadore, V., Mishra, S.R. & Ahmaruzzaman, M. Metal sulphides and their heterojunctions for photocatalytic degradation of organic dyes-A comprehensive review. Environ Sci Pollut Res 30, 90410–90457 (2023). https://doi.org/10.1007/s11356-023-28753-w

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