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• 作者：Hong-Fei Shi ; Gang Yan ; Yi Zhang ; Hua-Qiao Tan ; Wen-Zhe Zhou ; Yuan-Yuan Ma ; Yang-Guang Li ; Weilin Chen ; En-Bo Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：9
• 期：1
• 页码：422-430
• 全文大小：650K
• ISSN：1944-8252

文摘

Photocatalysis, a promising technology platform to address the environmental problems, has been attracting considerable attention. In this paper, Ag/Ag<sub>xsub>H<sub>3–xsub>PMo<sub>12sub>O<sub>40sub> (simplified as Ag/AgHPMo<sub>12sub>) nanowires have been synthesized by a facile solid reaction route and in situ photodeposited method. The results of SEM and TEM indicate that the diameters of AgHPMo<sub>12sub> nanowires are about 45 ± 10 nm, and Ag nanoparticles with diameters in the range of 5–15 nm are uniformly anchored on the surface of AgHPMo<sub>12sub> nanowires. The Ag content in the Ag/AgHPMo<sub>12sub> composite was manipulated by the light irradiation time (Ag/AgHPMo<sub>12sub>-x; x stands for the irradiation time; x = 2, 4, 6, 8 h, respectively). With increasing irradiation time, the light absorption of as-synthesized samples in the visible region was gradually enhanced. The Ag/AgHPMo<sub>12sub>-4 exhibits the best photocatalytic performance for the degradation of methyl orange and reduction of Cr<sub>2sub>O<sub>7sub><sup>2–sup> under visible-light (λ > 420 nm) irradiation. The study of the photocatalytic mechanism reveals that both Ag and AgHPMo<sub>12sub> can be excited by visible light. The photoinduced electrons were transferred from AgHPMo<sub>12sub> to metallic Ag, and combined with the Ag plasmonic holes. The Ag plasmonic electrons were trapped by O<sub>2sub> to form ·O<sub>2sub><sup>–sup>, or directly reduced Cr<sub>2sub>O<sub>7sub><sup>2–sup> to Cr<sup>3+sup>. Meanwhile, the ·O<sub>2sub><sup>–sup> species and the photogenerated holes of AgHPMo<sub>12sub> were used to oxidize MO or i-PrOH; thus, they showed highly efficient and recyclable photocatalytic performance for removing the organic and inorganic pollutants.