One-pot calcination synthesis of Cd0.5Zn0.5S/g-C3N4 photocatalyst with a step-scheme heterojunction structure. (1st November 2020)

• Record Type: Journal Article
• Authors: Qin, Dongran; Xia, Yang; Li, Qin; Yang, Chao; Qin, Yanmin; Lv, Kangle
• Is Part Of: Journal of materials science & technology. Volume 56(2020)
• Page Start: 206
• Page End: 215
• Publication Date: 2020-11-01
• Subjects: Cd0.5Zn0.5S -- g-C3N4 -- S-scheme heterojunction -- Photocatalysis -- Visible light; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.03.034
• Languages: English
• ISSNs: 1005-0302

Abstract

Graphical abstract: Highly-efficient Cd0.5 Zn0.5 S/g-C3 N4 composite photocatalyst with a step-scheme heterojunction structure was synthesized by direct annealing a sandwich of cadmium − zinc − thiourea precursors in one pot. Highlights: Cd0.5 Zn0.5 S/g-C3 N4 composites were prepared by a novel one-pot calcination method. Only three kinds of reagents were used as the precursors for the CZS/CN composites. The optimal sample showed robust visible-light photoactivity for RhB degradation. The interfacial charge transfer followed the S-scheme heterojunction mechanism. Abstract: Cd0.5 Zn0.5 S/g-C3 N4 (CZS/CN) step-like heterojunction composites were facilely synthesized by annealing a sandwich of cadmium−zinc−thiourea precursors in one pot. The types of the used raw materials and the preparation procedure were simplified as much as possible in this work. The obtained hybrid exhibited enlarged specific surface area and higher separation/transfer efficiency of charge carriers compared to pure Cd0.5 Zn0.5 S and g-C3 N4, thus exhibited much enhanced photocatalytic efficiency for dye degradation under visible-light irradiation. The interfacial charge-transfer mechanism of the formed step-scheme (S-scheme) heterojunction between Cd0.5 Zn0.5 S and g-C3 N4 were carefully investigated and discussed. This work could widen the application prospect of the Cd x Zn1– x S/g-C3 N4 composite and provide new ideas to the design and fabrication of novel heterojunctions with robust photocatalytic performance.