Ti掺杂Bi2O3的光催化性能

采用溶胶—活性炭浸渍法制备了掺杂不同比例Ti的Bi2O3粉体光催化剂,并利用X射线衍射分析(XRD)、BET比表面积测试法(BET)、扫描电镜分析(SEM)、紫外—可见光漫反射谱(UV-Vis DRS)等技术对其进行了表征。表征结果显示,掺Ti的Bi2O3样品在紫外区有比纯Bi2O3更强的吸光性能。通过对甲基橙在紫外光(λmax=365 nm)下的降解实验评价光催化剂的光催化活性,考察不同钛掺杂量及不同焙烧温度对光催化性能的影响。结果表明,当光催化剂中钛掺杂摩尔百分含量为3%,焙烧温度为300℃,其光催化活性最好。当催化剂用量为2 g/L时,在120 min内,对浓度为20 mg/L的甲基橙溶液进行光催化降解,其降解率达96.4%。

Photocatalytic performance of Ti-dopped Bi2 O3

A series of Bi2O3 photocatalysts doped with different amounts of titanium were prepared by the active carbon-assisted-sol method and then calcined at different temperatures.The prepared pure Bi2O3 and Ti-doped Bi2O3 samples were characterized by X-ray diffraction(XRD),nitrogen adsorption,scanning electron microscopy(SEM),and ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS).The characterization results revealed that all of the Ti-doped Bi2O3 samples exhibited stronger absorbance in ultraviolet light range than pure Bi2O3.The photocatalytic activity of the samples were evaluated by the photodegradation of methyl orange under UV light(λmax=365 nm) irradiation.The influences of Ti doping contents and calcination temperatures were also analyzed.The results show that at the optimal calcination temperature of 300 °C and 3%(molar ratio) of titanium doping the composite photocatalyst has much higher photocatalytic activity compared with pure Bi2O3.When the concentration of catalyst loading is 2 g/L,the degradation rate of methyl orange(20 mg/L) reached 96.4% under ultraviolet irradiation for 120 min.