Issue 45, 2016

Ultrafine Ag/polyoxometalate-doped AgCl nanoparticles in metal–organic framework as efficient photocatalysts under visible light

Abstract

A new composite material of ultrafine Ag/PW11O39-doped AgCl nanoparticles (NPs) encapsulated in a metal–organic framework (NH2-MIL-101(Al)) was prepared by an incipient wetness impregnation method together with photo-reduction under UV irradiation. The as-prepared composite material (abbr. Ag/POM-AgCl@NH2-MIL-101(Al)) was characterized by XRD, EDX, SEM, XPS, FT-IR and diffuse reflectance spectroscopy (DRS). By virtue of the coordination interaction between the polyoxometalate (POM) unit and Ag+ ion in the K6[α-AgPW11O39] precursor and the confined cavity of NH2-MIL-101(Al), the fast reaction between Ag+ and Cl ions was depressed and the over agglomeration of crystalline AgCl was limited. When the partial Ag+ ions were reduced into Ag0 metal in the AgCl NPs under UV irradiation, the resultant ultrafine Ag/POM-AgCl nanoparticles (NPs) possess an average particle size of 3.2 nm in diameter, representing one of the currently smallest Ag/AgCl composite NPs. The catalytic activity of this material was evaluated by the catalytic reduction of 4-nitrophenol and photocatalytic degradation of Rhodamine B (RhB) under visible light irradiation. Compared with its counterparts (Ag/AgCl NPs@NH2-MIL-101(Al)), the introduction of POM units into the Ag/AgCl composite NPs significantly improved the photocatalytic activity for degradation of RhB under visible light irradiation. A relevant photocatalytic mechanism was proposed.

Graphical abstract: Ultrafine Ag/polyoxometalate-doped AgCl nanoparticles in metal–organic framework as efficient photocatalysts under visible light

Supplementary files

Article information

Article type
Paper
Submitted
19 Sep 2016
Accepted
19 Oct 2016
First published
19 Oct 2016

CrystEngComm, 2016,18, 8762-8768

Ultrafine Ag/polyoxometalate-doped AgCl nanoparticles in metal–organic framework as efficient photocatalysts under visible light

J. Yan, W. Zhou, H. Tan, X. Feng, Y. Wang and Y. Li, CrystEngComm, 2016, 18, 8762 DOI: 10.1039/C6CE02021F

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