Cu/Ag掺杂TiO<sub>2</sub>包覆SiO<sub>2</sub>纳米复合材料的结构与光催化性能

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Abstract The TiO₂-coated SiO₂ (TCS) nanocatalysts with about 12 nm thickness coating and high dipersity were synthesized by the sol-gel method. Based on the previous experiment, the photocatalytic efficiency of TCS catalysts was enhanced notably by doping Cu and Ag. The effects of coating and doping on the structure and photocatalytic activity of TiO₂ and the relative mechanism were investigated by XRD, XPS, UV-vis and the photocatalytic degradation experiment of methyl orange. The results show that, the Ti—O—Si bonds between the interface of TiO₂ and SiO₂ have an impact on the crystallization process of TiO₂ and restrain the growth of the grains. Cu₂O-TiO₂-SiO₂ composite powder with excellent performance can be synthesized by controlling the experimental conditions. The reinforcement mechanism of doping Cu can be ascribed to the modification of Cu₂O semiconductor to TiO₂. The increasing of photocatalytic property is related to the oxygen vacancy and Cu₂O particles. Doping Ag cannot change the width of the forbidden band but can improve the intensity of light absorption, and the photocatalytic degradation efficiency is 95.7% after doping 1.0%Ag.

Key words： TiO₂ SiO₂ Cu₂O Ag doping photocatalytic

Received: 07 April 2017 Published: 11 July 2019

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	GUAN Renfa
	XIAO Ya
	LIU Qiming
	LIU Shaojun

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GUAN Renfa,XIAO Ya,LIU Qiming, et al. Synthesis and photocatalytic property of SiO₂ nanopowder coated by Cu/Ag-doped TiO₂[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(1): 101-109.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I1/101

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