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Nano Research 2019, 12(5): 955-972 https://doi.org/10.1007/s12274-019-2287-0
Review Article | Issue | Published: 17 January 2019

Photocatalysts for degradation of dyes in industrial effluents: Opportunities and challenges

Show Author's Information Hassan Anwer1,§,  Asad Mahmood1,§,  Jechan Lee2,§,  Ki-Hyun Kim1( ),  Jae-Woo Park1( ),  Alex C. K. Yip3
Department of Civil and Environmental Engineering,Hanyang University,222 Wangsimni-ro, Seoul,04763,Republic of Korea;
Department of Environmental and Safety Engineering,Ajou University,Suwon,16499,Republic of Korea;
Department of Chemical and Process Engineering,University of Canterbury,Christchurch,8041,New Zealand;

§ Hassan Anwer, Asad Mahmood, and Jechan Lee contributed equally to this work.

Keywords:
performance evaluation, photocatalyst, dye wastewater, degradation mechanism
Topics:
Cadmium sulfideIIPhotocatalysisPhotocatalystsTin oxidesTitanium DioxideTungsten compoundsVI semiconductors
Cite this article:
Anwer H, Mahmood A, Lee J, et al. Photocatalysts for degradation of dyes in industrial effluents: Opportunities and challenges. Nano Research, 2019, 12(5): 955-972. https://doi.org/10.1007/s12274-019-2287-0
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Abstract Full text About this article

Discharging dye contaminants into water is a major concern around the world. Among a variety of methods to treat dye-contaminated water, photocatalytic degradation has gained attention as a tool for treating the colored water. Herein, we review the recent advancements in photocatalysis for dye degradation in industrial effluents by categorizing photocatalyst materials into three generations. First generation photocatalysts are composed of single-component materials (e.g., TiO2, ZnO, and CdS), while second generation photocatalysts are composed of multiple components in a suspension (e.g., WO3/NiWO4, BiOI/ZnTiO3, and C3N4/Ag3VO4). Photocatalysts immobilized on solid substrates are regarded as third generation materials (e.g., FTO/WO3-ZnO, Steel/TiO2-WO3, and Glass/P-TiO2). Photocatalytic degradation mechanisms, factors affecting the dye degradation, and the lesser-debated uncertainties related to the photocatalysis are also discussed to offer better insights into environmental applications. Furthermore, quantum yields of different photocatalysts are calculated, and a performance evaluation method is proposed to compare photocatalyst systems for dye degradation. Finally, we discuss the present limitations of photocatalytic dye degradation for field applications and the future of the technology.


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About this article

Photocatalysts for degradation of dyes in industrial effluents: Opportunities and challenges

Show Author's information Hassan Anwer1,§, Asad Mahmood1,§, Jechan Lee2,§, Ki-Hyun Kim1( ), Jae-Woo Park1( ), Alex C. K. Yip3
Department of Civil and Environmental Engineering,Hanyang University,222 Wangsimni-ro, Seoul,04763,Republic of Korea;
Department of Environmental and Safety Engineering,Ajou University,Suwon,16499,Republic of Korea;
Department of Chemical and Process Engineering,University of Canterbury,Christchurch,8041,New Zealand;

§ Hassan Anwer, Asad Mahmood, and Jechan Lee contributed equally to this work.

Abstract

Discharging dye contaminants into water is a major concern around the world. Among a variety of methods to treat dye-contaminated water, photocatalytic degradation has gained attention as a tool for treating the colored water. Herein, we review the recent advancements in photocatalysis for dye degradation in industrial effluents by categorizing photocatalyst materials into three generations. First generation photocatalysts are composed of single-component materials (e.g., TiO2, ZnO, and CdS), while second generation photocatalysts are composed of multiple components in a suspension (e.g., WO3/NiWO4, BiOI/ZnTiO3, and C3N4/Ag3VO4). Photocatalysts immobilized on solid substrates are regarded as third generation materials (e.g., FTO/WO3-ZnO, Steel/TiO2-WO3, and Glass/P-TiO2). Photocatalytic degradation mechanisms, factors affecting the dye degradation, and the lesser-debated uncertainties related to the photocatalysis are also discussed to offer better insights into environmental applications. Furthermore, quantum yields of different photocatalysts are calculated, and a performance evaluation method is proposed to compare photocatalyst systems for dye degradation. Finally, we discuss the present limitations of photocatalytic dye degradation for field applications and the future of the technology.

Keywords: performance evaluation, photocatalyst, dye wastewater, degradation mechanism

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Publication history
Copyright
Acknowledgements

Publication history

Received: 22 September 2018
Revised: 27 December 2018
Accepted: 03 January 2019
Published: 17 January 2019
Issue date: May 2019

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Acknowledgements

Acknowledgements

K. H. K. and J. W. P. acknowledge support made by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, & Future Planning Grant Nos. 2016R1E1A1A01940995 and 2018R1A2A1A05023555, respectively.

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