Hu J, Chen F, Mao J, Ni L, Lu J. Direction regulation of interface carrier transfer and enhanced photocatalytic oxygen activation over Z-scheme Bi
4V
2O
11/Ag/AgCl for water purification.
J Colloid Interface Sci 2023;
641:695-706. [PMID:
36965341 DOI:
10.1016/j.jcis.2023.03.007]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 02/18/2023] [Accepted: 03/01/2023] [Indexed: 03/09/2023]
Abstract
Molecular oxygen activation is essential to the photocatalytic oxidation reaction, which is highly dependent on the construction of active sites and efficient charge transfer of photocatalysts. In this study, we constructed Bi4V2O11/Ag/AgCl Z-type heterojunction photocatalysts with significantly enhanced molecular oxygen activation capacity. The systematic characterization and analysis including X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations confirmed that the formation of efficient Z-type heterostructure could be attributed to the introduction of Ag nanoparticles (NPs), which regulated the electron transfer direction from Bi4V2O11 to AgCl. Owing to the advantage of enhanced charge transfer efficiency, the O2- generation capacity of Bi4V2O11/Ag/AgCl Z-scheme heterojunction was as high as 4.6 times that of pure Bi4V2O11. Consequently, Bi4V2O11/Ag/AgCl showed good degradation performance against tetracycline (TC), ciprofloxacin (CIP), ranitidine hydrochloride (RAN) and 2,4-dichlorophenoxyacetic acid (2,4-D) under visible light, and their degradation rates were 8.2 times, 5.9 times, 3.8 times and 11.9 times higher than those of Bi4V2O11, respectively. This study provides an effective and feasible strategy to design photocatalyst with improved molecular oxygen activation efficiency.
Collapse