期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 218, 期 -, 页码 452-459出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2017.06.075
关键词
MIL-68(Fe); CdS; 4-Nitroaniline; Visible light; Selective reduction
资金
- National Natural Science Foundation of China [51672048, 21473096]
- Major Science and Technology Projects of Fujian Province [2015YZ0001-1]
Visible-light-initiated organic transformations have received much attention because of low cost, relative safety, and environmental friendliness. In this work, a series of CdS-decorated MIL-68(Fe) nanocomposites (CdS-M68 NCs) have been prepared via a facile room-temperature photodeposition technique in a controlled manner. Importantly, the CdS-M68 NCs exhibit remarkably enhanced photoactivity toward selective reduction of 4-nitroaniline (4-NA) to p-phenylenediamine (PPD) in water under visible light irradiation (lambda >= 420 nm) as compared to bare CdS and MIL-68(Fe), giving a 4-NA conversion of similar to 100% after irradiation for 8 min. The significantly enhanced photoactivity is attributed to the integrated factors of the effective transportation of the photogenerated electron-hole pairs and the enhanced visible light absorption intensity. Combining with trapping experiments and ESR analysis, it could be revealed that the photoexcited electrons and center dot CO2- radicals should be the main active species in the present system. In addition, a possible photocatalytic reduction mechanism has been investigated. (C) 2017 Elsevier B.V. All rights reserved.
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