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Construction of heterostructured MIL-125/Ag/g-C3N4 nanocomposite as an efficient bifunctional visible light photocatalyst for the organic oxidation and reduction reactions
- Source :
- Applied Catalysis B: Environmental. 205:42-54
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Photocatalytic synthesis using visible light is a desirable chemical process because of its potential to utilize sunlight. A heterostructured MIL-125/Ag/g-C3N4 nanocomposite was implemented as an efficient bifunctional visible-light response catalyst for the photoreduction of nitrocompounds and the oxidation of alcohols. The photocatalyst was prepared via an accessible method and characterized by XRD, SEM, TEM, XPS, FT-IR, N2 adsorption–desorption isotherm, UV–vis DRS, PL and EIS. The reactive efficiency of the photocatalyst depends on two primary factors, one is the light adsorption of catalysts, Ag nanoparticles (NPs) were photodeposited on the surface of g-C3N4 and MIL-125 to increase visible-light absorption via the surface plasmon resonance. And the other is the separation efficiency of the photogenerated charge carrier. As an electron-conduction bridge in the interface between MIL-125 and g-C3N4, Ag NPs could facilitate the direct migration of photoinduced electrons from g-C3N4 to MIL-125 and retard the recombination of electron-holes. Therefore, the MIL-125/Ag/g-C3N4 sample shows highest photocatalytic activity compared with MIL-125, g-C3N4, MIL-125/Ag and MIL-125/g-C3N4. A corresponding photocatalytic mechanism of these reactions was discussed in detail. Moreover, the photoreduction of nitrocompounds and oxidation of the alcohols with superior conversions and selectivities were obtained, and the catalyst can be recycled four times. It is concluded that MIL-125/Ag/g-C3N4 would be a promising visible light photocatalyst in the field of selective organic transformations.
- Subjects :
- Materials science
Nanocomposite
Process Chemistry and Technology
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Catalysis
0104 chemical sciences
chemistry.chemical_compound
Adsorption
chemistry
Alcohol oxidation
Photocatalysis
Surface plasmon resonance
0210 nano-technology
Bifunctional
General Environmental Science
Visible spectrum
Subjects
Details
- ISSN :
- 09263373
- Volume :
- 205
- Database :
- OpenAIRE
- Journal :
- Applied Catalysis B: Environmental
- Accession number :
- edsair.doi...........c12620a2377f2d7595de103dfbbc189d