کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6453774 | 1418802 | 2017 | 8 صفحه PDF | دانلود رایگان |
- CdS-MIL-68(Fe) photocatalysts are prepared by a facile photodeposition method.
- The product exhibits excellent photoactivity for 4-nitroaniline (4-NA) reduction.
- Hole scavengers and N2 atmosphere are indispensable for the reduction.
- Photoexcited electrons and CO2â are the main active species in this reaction.
- MOFs-based materials are firstly applied to the photoreduction of 4-NA.
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 (λ â¥Â 420 nm) as compared to bare CdS and MIL-68(Fe), giving a 4-NA conversion of â¼100% 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 CO2â radicals should be the main active species in the present system. In addition, a possible photocatalytic reduction mechanism has been investigated.
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Journal: Applied Catalysis B: Environmental - Volume 218, 5 December 2017, Pages 452-459