Preparation of modified TiO2 and its photocatalytic properties

Abstract

In this chapter, tetrabutyl titanate was used as the titanium source, and the photocatalytic performance of commercial TiO₂ and self-made TiO₂ was compared by sol-gel method. Since ready-made commercial TiO₂ is not easy to be doped and modified, this chapter also performs alkali solution surface modification at the same time as self-made TiO₂ (that is, the TiO₂ to be modified is immersed in alkali solution at different pH values and then dried), and the photocatalytic performance of the two before and after the surface modification of alkali solution is compared. In order to improve the photocatalytic performance of self-made TiO₂, this chapter modifies the iron doping of self-made TiO₂ during the preparation process to enhance its photocatalytic performance. After iron doping modification of TiO₂, in order to further improve its performance, the modified sample was modified with alkali solution surface. In this paper, the microscopic characterization and nitrogen and oxygen catalytic performance tests of each sample were carried out, and the results showed that the photocatalytic performance of self-prepared TiO₂ was significantly better than that of commercial TiO₂. Among the TiO₂ modified by different pH solutions, the catalytic performance was the best at pH 11.5, and the photocatalytic performance of Fe-doped TiO₂ was also improved to varying degrees compared with pure TiO₂, among which Fe doping 0.5% contributed the most to the photocatalytic performance. After the surface modification of Fe (0.5%)-TiO₂ with the best doping amount by alkali solution, the photocatalytic performance was also improved.