A novel n-p heterojunction Bi 2 S 3 /ZnCo 2 O 4 photocatalyst for boosting visible-light-driven photocatalytic performance toward indigo carmine.

Autor: Mai Tho NT; Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City Ho Chi Minh Vietnam nguyenthimaitho@iuh.edu.vn., Van Cuong N; Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City Ho Chi Minh Vietnam nguyenthimaitho@iuh.edu.vn., Luu Thi VH; Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City Ho Chi Minh Vietnam nguyenthimaitho@iuh.edu.vn., Thang NQ; Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City Ho Chi Minh Vietnam nguyenthimaitho@iuh.edu.vn., Dang PH; Faculty of Fundamental Science, Industrial University of Ho Chi Minh City Ho Chi Minh Vietnam danghuuphuc@iuh.edu.vn.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2023 May 31; Vol. 13 (24), pp. 16248-16259. Date of Electronic Publication: 2023 May 31 (Print Publication: 2023).
DOI: 10.1039/d3ra02803h
Abstrakt: An innovative p-n heterojunction Bi 2 S 3 /ZnCo 2 O 4 composite was first fabricated via a two-step co-precipitation and hydrothermal method. By controlling the weight amount of Na 2 S and Bi(NO 3 ) 3 precursor, different heterogeneous x Bi 2 S 3 /ZnCo 2 O 4 were synthesized ( x = 0, 2, 6, 12, and 20). The p-n heterojunction Bi 2 S 3 /ZnCo 2 O 4 was characterized by structural, optical, and photochemical properties and the photocatalyst decoloration of indigo carmine. Mott-Schottky plots proved a heterojunction formed between n-Bi 2 S 3 and p-ZnCo 2 O 4 . Furthermore, the investigation of the photocurrent response indicated that the Bi 2 S 3 /ZnCo 2 O 4 composite displayed an enhanced response, which was respectively 4.6 and 7.3 times (4.76 μA cm -2 ) greater than that of the pure Bi 2 S 3 (1.02 μA cm -2 ) and ZnCo 2 O 4 (0.65 μA cm -2 ). Especially the optimized p-n Bi 2 S 3 /ZnCo 2 O 4 heterojunction with 12 wt% Bi 2 S 3 showed the highest photocatalyst efficacy of 92.1% at 40 mg L -1 solutions, a loading of 1.0 g L -1 , and a pH of 6 within 90 min of visible light illumination. These studies prove that p-n Bi 2 S 3 /ZnCo 2 O 4 heterojunction photocatalysts can greatly boost their photocatalytic performance because the inner electric field enhances the process of separating photogenerated electron-hole pairs. Furthermore, this composite catalyst showed good stability and recyclability for environmental remediation.
Competing Interests: The authors declare that they have no known competing interests that could have appeared to influence the work reported in this paper.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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