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Review

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

1
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
2
Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
3
Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 30010, Taiwan
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(5), 430; https://doi.org/10.3390/catal9050430
Received: 12 April 2019 / Revised: 1 May 2019 / Accepted: 3 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Sustainable Applications in Surface Chemistry and Catalysis)
Due to its low cost, environmentally friendly process, and lack of secondary contamination, the photodegradation of dyes is regarded as a promising technology for industrial wastewater treatment. This technology demonstrates the light-enhanced generation of charge carriers and reactive radicals that non-selectively degrade various organic dyes into water, CO2, and other organic compounds via direct photodegradation or a sensitization-mediated degradation process. The overall efficiency of the photocatalysis system is closely dependent upon operational parameters that govern the adsorption and photodegradation of dye molecules, including the initial dye concentration, pH of the solution, temperature of the reaction medium, and light intensity. Additionally, the charge-carrier properties of the photocatalyst strongly affect the generation of reactive species in the heterogeneous photodegradation and thereby dictate the photodegradation efficiency. Herein, this comprehensive review discusses the pseudo kinetics and mechanisms of the photodegradation reactions. The operational factors affecting the photodegradation of either cationic or anionic dye molecules, as well as the charge-carrier properties of the photocatalyst, are also fully explored. By further analyzing past works to clarify key active species for photodegradation reactions and optimal conditions, this review provides helpful guidelines that can be applied to foster the development of efficient photodegradation systems. View Full-Text
Keywords: cationic dye; anionic dye; direct photoderadation; sensitization-mediated degradation; quantum yield cationic dye; anionic dye; direct photoderadation; sensitization-mediated degradation; quantum yield
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MDPI and ACS Style

Chiu, Y.-H.; Chang, T.-F.M.; Chen, C.-Y.; Sone, M.; Hsu, Y.-J. Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts. Catalysts 2019, 9, 430. https://doi.org/10.3390/catal9050430

AMA Style

Chiu Y-H, Chang T-FM, Chen C-Y, Sone M, Hsu Y-J. Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts. Catalysts. 2019; 9(5):430. https://doi.org/10.3390/catal9050430

Chicago/Turabian Style

Chiu, Yi-Hsuan, Tso-Fu M. Chang, Chun-Yi Chen, Masato Sone, and Yung-Jung Hsu. 2019. "Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts" Catalysts 9, no. 5: 430. https://doi.org/10.3390/catal9050430

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