Han B, Bi R, Zhou C, Liu Z, Lou Y, Wang Z. Ag-enhanced CeF
3-O: highly enhanced photocatalytic performance under NIR light irradiation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022;
29:85095-85102. [PMID:
35793014 DOI:
10.1007/s11356-022-21808-4]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
CeF3-O with intermediate band showed improved synergic photodegradation activity toward HCl-TC and RhB under NIR light irradiation when enhanced by Ag as a cocatalyst. Ag+ ions take electrons from the second transition in CeF3-O's intermediate band, which are then reduced to Ag as cocatalyst. The photodegradation efficiencies of HCl-TC by various Ag/CeF3-O nanoparticles in 180-min increase from 26.5 to 73.1%. The optimal Ag/CeF3-O-100 is about 2.76 times that of pure CeF3-O. Ag/CeF3-O-100 has an apparent rate constant of 4.5 × 10-3 min-1, which is 3.0 times that of pure CeF3-O. Similarly, Ag/CeF3-O-10 achieves a superior photodegradation efficiency of RhB at 96.7% under NIR light within 120 min. Its apparent rate constant of 27.7 × 10-3 min-1 is 12.0 times that of pure CeF3-O (2.3 × 10-3 min-1). Further, the turnover frequencies of Ag/CeF3-O nanoparticles are greatly higher than that of the corresponding pure CeF3-O nanoparticles. Ag-enhanced CeF3-O has a unique metal-semiconductor interface where Ag acts as a bridge for facilitating charge transfer and the separation efficiency of photogenerated carries. The synergic effect between CeF3-O and Ag provides a practical technique for enhancing the wastewater treatment with NIR light irradiation.
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