Photocatalytic activity of bauxite-tailings supported nano-TiO2
来源期刊：中南大学学报(英文版)2010年第4期
论文作者：卢清华 胡岳华 王梦
文章页码：755 - 759
Key words：TiO2; bauxite-tailings; phenol; photocatalytic activity
Abstract: TiO2/bauxite-tailings (TiO2/BTs) composites were prepared via a chemical liquid deposition method and characterized by X-ray diffractometry (XRD), scanning electronic microscopy (SEM) and N2 adsorption analysis. The photocatalytic performance of TiO2/BTs composites was evaluated with UV–Vis spectrophotometer following the changes of phenol concentration under different illumination time. Effects of the calcination temperature, the pH and the cycles on the photocatalytic activity of TiO2/BTs composites were investigated. The composites calcined at 500 and 600 ℃ exhibit the best photocatalytic performance, and the phenol degradation ratios reacting for 40 and 160 min reach 35% and 78% respectively under the same conditions, higher than those of 29% and 76% of the Degussa P25(TiO2). The ability of TiO2/BTs500 (BTs500 represents bauxite-tailings calcined at 500 ℃) composites to degrade phenol increases with decreasing pH.
