关键词: 磷掺杂 , 溶胶－凝胶法 , 二氧化钛 , 可见光催化剂

Abstract: The preparation conditions of P-doped nano-TiO₂potocatalyst were investigated by the sol-gel method. The effect of preparation conditions on optical activity and photocatalytic degradation of organic pollutants were studied by UV and visible light. The research conditions including roasting temperature, roasting time, molar ratio of glacial acetic acid to tetrabutyl titanate, P and Ti molar ratio, amount of adding water and ethanol. Target pollutant was methylene blue dye, which exhibits difficult biochemical degradable characters. The photocatalytic activity of potocatalyst was analyzed by degradation rate. The results show that the appropriate amount of P doping can effectively promote the photocatalytic activity of TiO₂ nanoparticles with the photocatalyst sol-gel method. The best catalyst preparation condition was that mole fraction of P-doped 6%, calcined at 600 ℃ for 120 min, glacial acetic acid with butyl titanate four molar ratio of 3∶1, water volume 80 mL, ethanol consumption 60 mL. The degradation rate of methylene blue in the visible light is 88.0% under these preparation conditions.

Key words: P-doped, Sol-Gel, TiO₂, Visible catalyst