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Issue 34, 2015
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Nonmetal–metal–semiconductor-promoted P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst with superior photocatalytic activity and stability

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Abstract

Recently, modifying TiO2 to develop visible-light-driven photocatalysts via doping with nonmetal elements, metals and semiconductors has attracted much attention. In this study, a facile and reproducible sol–gel method was utilized for the first time to codope nonmetal (P), metal (Ag) and narrow band gap semiconductors (Ag2O and Ag3PO4) in TiO2 to prepare a P/Ag/Ag2O/Ag3PO4/TiO2 composite photocatalyst for developing a novel visible-light-driven photocatalyst. The crystal structure, morphology and optical properties of P/Ag/Ag2O/Ag3PO4/TiO2 were systemically characterized, and the photocatalytic abilities were evaluated under simulated solar light, in comparison with pure TiO2 and Ag/Ag2O/TiO2 photocatalysts. The results indicated that the P/Ag/Ag2O/Ag3PO4/TiO2 composite photocatalyst exhibited a strong absorption band in the visible light region, a small band gap (about 2.2 eV) and extremely high separation efficiency of photo-excited electron–hole pairs, which could account for its enhanced photocatalytic performance. The degradation ratio of rhodamine B (Rh B) by P/Ag/Ag2O/Ag3PO4/TiO2 reached 97.1% after 60 min under simulated solar light with only 13 mW cm−2 light intensity, while just 26.6% and 66.7% of Rh B were degraded by the as-prepared TiO2 and Ag/Ag2O/TiO2 photocatalysts, respectively. Furthermore, the radical trapping experiments implied that photo-generated holes and O2˙ radicals in the P/Ag/Ag2O/Ag3PO4/TiO2 composite photocatalyst were the major active species for Rh B degradation. Metallic Ag could effectively trap the photo-generated electrons from Ag3PO4 and Ag2O to reduce the possibility of decomposing Ag3PO4 and Ag2O, resulting in an improved stability of the P/Ag/Ag2O/Ag3PO4/TiO2 composite with high photocatalytic ability.

Graphical abstract: Nonmetal–metal–semiconductor-promoted P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst with superior photocatalytic activity and stability

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Publication details

The article was received on 09 Jul 2015, accepted on 22 Jul 2015 and first published on 22 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA05153C
Citation: J. Mater. Chem. A, 2015,3, 17858-17865
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    Nonmetal–metal–semiconductor-promoted P/Ag/Ag2O/Ag3PO4/TiO2 photocatalyst with superior photocatalytic activity and stability

    X. Hu, Q. Zhu, X. Wang, N. Kawazoe and Y. Yang, J. Mater. Chem. A, 2015, 3, 17858
    DOI: 10.1039/C5TA05153C

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