稀土元素钬掺杂二氧化钛光催化剂的制备及对碱性品红降解性能研究

Preparation of Rare Earth Ho Doped TiO2 and Study on Its Photocatalytic Activity on Degradation of Basic Fuchsin

摘要: 采用溶胶-凝胶法制备了纯二氧化钛和稀土元素钬掺杂的二氧化钛光催化剂,以碱性品红为指示剂,采用紫外-可见分光光度法对样品的光催化性能进行了研究。结果表明:当掺杂钬的物质的量的分数为0.3%,碱性品红的质量浓度为20 mg·L-1,温度为25 ℃,体系的pH值为6.2时,在可见光下4 h的脱色率达到20.0%;适量钬的掺杂可提高二氧化钛的光催化性能。

Abstract: Photocatalyts of pure TiO2 and Ho-doped TiO2 nanoparticles were prepared by sol-gel method, and their photocatalytic activity were studied by UV-Vis spectrophotometry using basic fuchsin as indicator. The optimized experimental conditions were found as follow: ① mole fraction of Ho doped: 0.3%; ② mass concentration of basic fuchsin: 20 mg·L-1; ③ temperature: 25 ℃; ④ value of pH of the system: 6.2. Value of discoloring ratio achieved at 20.0% after 4 h under visible light. It was proved that the photocatalytic activity of TiO2 was improved by doping with appropriate amount of Ho.