Yang Huaitao, Yang Junjiao
Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology Beijing 100029 China
RSC Adv. 2018 Mar 27;8(22):11921-11929. doi: 10.1039/c8ra00471d. eCollection 2018 Mar 26.
TiO films on a capillary column were prepared using tetrabutoxytitanium as a source of TiO the sol-gel method. The film thickness showed a linear increase with tetrabutoxytitanium concentration. The specific surface area of the film was improved by adding polyethylene glycol with different molecular weights. Under optimal conditions, the prepared film had a good mesoporous structure with specific surface area of 47.72 m g, and showed nearly spherical nanoparticles with a 10 nm diameter and anatase phase. Influences of the thickness, specific surface area, and initial solution concentration on photodegradation of rhodamine B using TiO films as a catalyst were investigated. The results showed that the photodegradation efficiency increased with an increasing thickness and specific surface area of TiO films. For a rhodamine B solution of 15 mg L, the photodegradation efficiency was 98.33% in 30 min under the optimal conditions. The catalysts could be reused up to eight times with almost the same efficiency, indicating a firm immobilization of films on the inner wall of the capillary. Therefore, TiO films are promising for the treatment of wastewater.
采用溶胶 - 凝胶法，以四丁氧基钛作为二氧化钛源，在毛细管柱上制备了二氧化钛薄膜。薄膜厚度随四丁氧基钛浓度呈线性增加。通过添加不同分子量的聚乙二醇提高了薄膜的比表面积。在最佳条件下，制备的薄膜具有良好的介孔结构，比表面积为47.72 m²/g，呈现出直径为10 nm的近球形纳米颗粒且为锐钛矿相。研究了二氧化钛薄膜的厚度、比表面积和初始溶液浓度对以其作为催化剂光降解罗丹明B的影响。结果表明，光降解效率随二氧化钛薄膜厚度和比表面积的增加而提高。对于15 mg/L的罗丹明B溶液，在最佳条件下30分钟内光降解效率为98.33%。催化剂可重复使用多达八次且效率几乎相同，表明薄膜牢固地固定在毛细管内壁上。因此，二氧化钛薄膜在废水处理方面具有广阔前景。
