Preparation and photocatalytic activity ofneodymium doping titania loaded to silicon dioxide
来源期刊:中国有色金属学报(英文版)2011年第2期
论文作者:杨学灵 朱丽 杨乐敏 周武艺 徐悦华
文章页码:335 - 339
关键词:二氧化钛;二氧化硅;钕掺杂;光催化;溶胶?凝胶法
Key words:titania; silicon dioxide; neodymium doping; photocatalysis; sol-gel method
摘 要:采用溶胶?凝胶法将掺钕二氧化钛负载在二氧化硅上制备复合光催化剂(Nd/TiO2-SiO2),利用XRD、SEM、FT-IR和DRS对Nd/TiO2-SiO2进行表征,并通过甲基橙溶液的光催化降解评价其光催化性能。结果表明:Nd/TiO2-SiO2在可见光区388?619 nm范围内的光吸收性能随着钕掺杂量的增大而增强,钕掺杂有利于降低电子?空穴的复合率,钕和二氧化硅提高TiO2的光催化活性。在600 °C煅烧的0.1% Nd/TiO2-SiO2的光催化活性最高,1 h后甲基橙降解率为82.9%。
Abstract: Neodymium doping titania was loaded to silicon dioxide to prepare Nd/TiO2-SiO2 by sol-gel method and Nd/TiO2-SiO2 was characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), Fourier transform-infrared spectroscopy (FT-IR) and diffuse reflectance spectra (DRS). Photocatalytic activities of Nd/TiO2-SiO2 with different neodymium contents were evaluated by degradation of methyl orange. The light absorption of Nd/TiO2-SiO2 increased with increasing doping neodymium in a visible light range of 388-619 nm, and Nd doping was in favor of decreasing the recombination of photo-generated electrons with holes. Nd and SiO2 improved the photocatalytic activity of TiO2. The optimal molar fraction of Nd to Ti was 0.1%, and the optimum calcination temperature was 600 °C. The highest degradation rate of methyl orange was 82.9% after irradiation for 1 h.