LIU Shaoyou^1,2, TANG Wenhua¹, FENG Qingge^2*, LUO Chenyan¹

(1. Institute of Applied Chemistry, Kaili University, Kaili, 556011, China; 2. College of Environment Studies, Guangxi University, Nanning 530004, China)

Abstract: Visible light degradation property of pyridine on the surface of Al-doped titanium dioxide materials prepared by a solid-state reaction was investigated. The correlations between microstructure and visible light catalytic activity for Al-doped TiO₂ materials were emphatically discussed. The results show that visible light degradation activity of pyridine on anatase Al-doped TiO₂ powder materials in a thermodynamics metastable state are higher than pure TiO₂, and it is positive to crystallite size but negative to crystal lattice distorting stress. The microdefects resulted from the doping of aluminum exist primarily as free volume defects, and as microvoid defects. However, the photocatalytic activity is determined by the concentration of microvoid defects. And it shows a positive correlation to the mean positron lifetime but a negative correlation to the ratio of positron lifetime density (I₁) in narrow capture area and positron lifetime density (I₂) in deep capture area. 

Key words: Al-doped TiO₂; Pyridine; Conentration of microdefects; Catalytic activity

E-mail: lsy651204@163.com　 tangwenhua2009@163.com 

Journal of Molecular Catalysis, Vol. 25, Issue 5, 2011, 442-448