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Article: Insights into the photocatalysis mechanism of the novel 2D/3D Z-Scheme g-C3N4/SnS2 heterojunction photocatalysts with excellent photocatalytic performances

TitleInsights into the photocatalysis mechanism of the novel 2D/3D Z-Scheme g-C3N4/SnS2 heterojunction photocatalysts with excellent photocatalytic performances
Authors
KeywordsCarbon nitride
Z-scheme photocatalyst
Photocatalytic degradation
Removal of Cr6+
Issue Date2021
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhazmat
Citation
Journal of Hazardous Materials, 2021, v. 402, p. article no. 123711 How to Cite?
AbstractA novel 2D/3D Z-scheme g-C3N4/SnS2 photocatalyst was successfully fabricated via self-assembly forming 3D flower-like SnS2 microspheres on the surface of the 2D g-C3N4 nanosheets. The photocatalytic performances of the samples were systematically explored through catalytic reduction of Cr6+ and oxidation of Bisphenol S (BPS) under the illumination of visible light, and the photocatalytic degradation pathway of BPS was also proposed based on the degradation products confirmed by GCsingle bondMS. Among the as-prepared samples, 0.4-g-C3N4/SnS2 exhibited the most efficient photocatalytic performances, and the apparent quantum efficiency (QE) for the removal of Cr6+ could achieve 30.3 %, which is 2.8 times higher than that of the SnS2. The enhancing photocatalytic activities originated from the efficient interfacial charge migration and separation obtained in g-C3N4/SnS2, which was firstly verified via the photoluminescence spectra, time-resolved photoluminescence spectra and photoelectrochemical characterizations. Importantly, the DFT calculated shows that the band distribution of the g-C3N4/SnS2 sample is staggered near the forbidden, which can facilitate the efficient interfacial charge migration and separation as well as result in the improvement of the catalytic activity. Finally, we put forward a more reasonable Z-scheme charge transfer mechanism, it was verified by analysing the results of free radical scavenging tests, EPR experiments and theoretical calculations.
Persistent Identifierhttp://hdl.handle.net/10722/300932
ISSN
2020 Impact Factor: 10.588
2020 SCImago Journal Rankings: 2.034

 

DC FieldValueLanguage
dc.contributor.authorZhao, W-
dc.contributor.authorLi, Y-
dc.contributor.authorZhao, P-
dc.contributor.authorZhang, L-
dc.contributor.authorDai, B-
dc.contributor.authorHuang, H-
dc.contributor.authorZhou, J-
dc.contributor.authorZhu, Y-
dc.contributor.authorMa, K-
dc.contributor.authorLeung, DYC-
dc.date.accessioned2021-07-06T03:12:14Z-
dc.date.available2021-07-06T03:12:14Z-
dc.date.issued2021-
dc.identifier.citationJournal of Hazardous Materials, 2021, v. 402, p. article no. 123711-
dc.identifier.issn0304-3894-
dc.identifier.urihttp://hdl.handle.net/10722/300932-
dc.description.abstractA novel 2D/3D Z-scheme g-C3N4/SnS2 photocatalyst was successfully fabricated via self-assembly forming 3D flower-like SnS2 microspheres on the surface of the 2D g-C3N4 nanosheets. The photocatalytic performances of the samples were systematically explored through catalytic reduction of Cr6+ and oxidation of Bisphenol S (BPS) under the illumination of visible light, and the photocatalytic degradation pathway of BPS was also proposed based on the degradation products confirmed by GCsingle bondMS. Among the as-prepared samples, 0.4-g-C3N4/SnS2 exhibited the most efficient photocatalytic performances, and the apparent quantum efficiency (QE) for the removal of Cr6+ could achieve 30.3 %, which is 2.8 times higher than that of the SnS2. The enhancing photocatalytic activities originated from the efficient interfacial charge migration and separation obtained in g-C3N4/SnS2, which was firstly verified via the photoluminescence spectra, time-resolved photoluminescence spectra and photoelectrochemical characterizations. Importantly, the DFT calculated shows that the band distribution of the g-C3N4/SnS2 sample is staggered near the forbidden, which can facilitate the efficient interfacial charge migration and separation as well as result in the improvement of the catalytic activity. Finally, we put forward a more reasonable Z-scheme charge transfer mechanism, it was verified by analysing the results of free radical scavenging tests, EPR experiments and theoretical calculations.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhazmat-
dc.relation.ispartofJournal of Hazardous Materials-
dc.subjectCarbon nitride-
dc.subjectZ-scheme photocatalyst-
dc.subjectPhotocatalytic degradation-
dc.subjectRemoval of Cr6+-
dc.titleInsights into the photocatalysis mechanism of the novel 2D/3D Z-Scheme g-C3N4/SnS2 heterojunction photocatalysts with excellent photocatalytic performances-
dc.typeArticle-
dc.identifier.emailLeung, DYC: ycleung@hku.hk-
dc.identifier.authorityLeung, DYC=rp00149-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jhazmat.2020.123711-
dc.identifier.pmid33254755-
dc.identifier.scopuseid_2-s2.0-85089801640-
dc.identifier.hkuros323070-
dc.identifier.volume402-
dc.identifier.spagearticle no. 123711-
dc.identifier.epagearticle no. 123711-
dc.publisher.placeNetherlands-

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