4.7 Article

Enhanced Photocatalytic Activity of Nanoparticle-Aggregated Ag-AgX(X 5 Cl, Br)@TiO2 Microspheres Under Visible Light

Journal

NANO-MICRO LETTERS
Volume 9, Issue 4, Pages -

Publisher

SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-017-0150-8

Keywords

Ag-AgX(X = Cl, Br)@TiO2; Nanoparticle-aggregated spheres; Methyl orange; Visible light; Photocatalysis

Funding

  1. China Postdoctoral Science Foundation [2016M602647]
  2. Science and Technology Research Project of Chongqing Municipal Education Commission of China [KJ1400607]
  3. Fundamental Research Funds for the Central Universities [CQDXWL-2014-001]
  4. NSFCQ [cstc2015jcyjA20020]
  5. NSFC [51572040, 51402112]
  6. National High Technology Research and Development Program of China [2015AA034801]

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Ag-AgX(X = Cl, Br)@TiO2 nanoparticle-aggregated spheres with different mass ratio of R = TiO2/Ag(X) from 35: 1 to 5: 1 were synthesized by a facile solgel technique with post-photoreduction. The photocatalytic activities of both Ag-AgCl@TiO2 and Ag-AgBr@TiO2 under visible light are effectively improved by similar to 3 times relative to TiO2 NPAS under the simulated sunlight for the decomposition of methyl orange (MO). Ag-AgBr@TiO2 showed 30% improvement and less stable in photocatalytic activity than that of AgCl@ TiO2. The role of Ag and AgX nanoparticles on the surface of Ag-AgX(X = Cl, Br)@TiO2 was discussed. Ag on these samples not only can efficiently harvest visible light especially for AgCl, but also efficiently separate excited electrons and holes via the fast electron transfer from AgX( X = Cl, Br) to metal Ag nanoparticles and then to TiO2-aggregated spheres on the surface of heterostructure. On the basis of their efficient and stable photocatalytic activities under visible-light irradiation, these photocatalysts could be widely used for degradation of organic pollutants in aqueous solution. [GRAPHICS] .

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