Fabrication of Z-scheme Cd0.85Zn0.15S/Co9S8 dual-functional photocatalyst for effective hydrogen evolution and organic pollutant degradation. (17th February 2023)

• Record Type: Journal Article
• Authors: Liu, Shurong; Xue, Xiaodong; Feng, Rui; Zhang, Ning; Zhang, Xue; Zhao, Yanxia; Sun, Meng; Yan, Tao; Wei, Qin
• Is Part Of: Nanotechnology. Volume 34:Number 18(2023)
• Publication Date: 2023-02-17
• Subjects: Z-scheme heterojunction -- photocatalytic hydrogen production -- CdxZn1−xS/Co9S8 -- organic pollutants degradation; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/acb777
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: A Z-scheme Cd0.85 Zn0.15 S/Co9 S8 (CZS-CS) photocatalyst was reasonably fabricated by a simple solvothermal method for the effective visible-light-driven H2 evolution and organic pollutants degradation. The precise construction of the CZS-CS composites provided an efficient heterogeneous contact interface and abundant reaction sites for the proposed photocatalytic reaction. The homogeneous Co9 S8 nanocrystals were uniformly wrapped on the surface of Cd0.85 Zn0.15 S nanorods, forming an intimate-contact interface, markedly contributed to the light collection and effectively inhibited the charge-carrier recombination. The optimized CZS-CS-15 composites exhibited a special H2 production rate reaching 19.15 mmol·h −1 ·g −1, roughly 1915 and 4.5 times of pure Co9 S8 and Cd0.85 Zn0.15 S samples and 85% of tetracycline (TC) molecule within 15 min was degraded. Furthermore, trapping experiments confirmed that h + was the main active species for TC photodegradation. Moreover, the obtained photocatalysts manifested stability without apparent activity declines during the proposed reactions. Finally, the Z-scheme photocatalytic mechanism was verified to illustrate the characteristics of efficient charge transfer and high redox ability. This study provided a rational and learnable strategy for designing dual-functional Z-scheme heterojunction photocatalysts.