KONG Qi, SUN Jiajie, JI Yuanyuan, HUANG Haisheng, WEI Zhishun
(School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, Hubei China)

Abstract: Controllable synthesis of self-assembled hierarchical TiO₂ with exposed (001) crystal facets is a research hotspot in the field of titanium dioxide photocatalysis. Self-assembled hierarchical TiO₂ exposed with large proportion of (001) crystal facet was prepared by using hydrothermal method with potassium fluotitanate as titanium source and potassium fluoride as morphology regulator. Furthermore, Pt was used to modify the surface of TiO₂ through photochemical deposition. The self-assembled hierarchical structure TiO₂ with (001) crystal plane has high purity, high size homogeneity and excellent photocatalytic degradation performance. The degradation rate of tetracycline hydrochloride (TC) reached 67.4% in one hour. The surface modification of Pt greatly enhanced the light absorption capacity and the separation efficiency of photogenerated charges, thus improving the photocatalytic performance, with TC degradation rate reaching 84.3% in one hour. Meanwhile, hydrogen production efficiency of water splitting reached 107.0 µmol·g⁻¹·h⁻¹ by using the Pt-TiO₂ photocatalyst.
Key words: TiO₂; photocatalytic; hierarchical structure; noble metal modification