摘要
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.
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 rain 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.
基金
Project(2005CB623701) supported by the National Key Basic Research Program of China
