4.7 Article

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

期刊

CRYSTENGCOMM
卷 18, 期 45, 页码 8762-8768

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ce02021f

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资金

  1. National Natural Science Foundation of China [21271039, 21401131, 21301166]
  2. Fundamental Research Funds for the Central Universities [2412016KJ018, 11SSXT140]
  3. Opening Project of Key Laboratory of Polyoxometalate Science of Ministry of Education [130014556]

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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 K-6[alpha-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 Ag-0 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.

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