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Enhanced photocatalytic degradation of organic pollutants and hydrogen production by a visible light-responsive Bi2WO6/ZnIn2S4 heterojunction

Chachvalvutikul, Auttaphon, Luangwanta, Tawanwit, Pattisson, Samuel, Hutchings, Graham J. and Kaowphong, Sulawan 2021. Enhanced photocatalytic degradation of organic pollutants and hydrogen production by a visible light-responsive Bi2WO6/ZnIn2S4 heterojunction. Applied Surface Science 544 , 148885. 10.1016/j.apsusc.2020.148885
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Abstract

In this work, we have reported the photocatalytic applications of the direct Z-scheme Bi2WO6/ZnIn2S4 heterojunction in the degradation of organic pollutants and the production of H2 gas. The nano-spherical shape of Bi2WO6 and porous structure of ZnIn2S4 particles, synthesized using cyclic microwave radiation method, facilitated the intimate interfacial contact of the heterojunction. Consequently, the photocatalytic activity of Bi2WO6/ZnIn2S4 towards degradation of salicylic acid (SA) and methylene blue (MB), the models of non-dye and dye organic pollutants, were maximized after introducing only 12.5%wt of Bi2WO6. Similarly, this photocatalyst demonstrated an enhancement in H2 production in comparison to the single-component photocatalysts. Furthermore, this photocatalyst maintained a high photoactivity after three repeated cycles for MB degradation and H2 production. The enhanced photo-efficacy of this heterojunction originates from the improved separation and transportation of photogenerated e-/h+ through a direct Z-scheme system. This was evidenced by electrochemical analyses and active species trapping experiments, combined with the consideration of reduction potential of reactive oxygen species.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 0169-4332
Date of First Compliant Deposit: 5 January 2021
Date of Acceptance: 28 December 2020
Last Modified: 23 Feb 2021 13:42
URI: http://orca.cf.ac.uk/id/eprint/137308

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