基于二氧化钛复合光催化材料的制备及其可见光光催化性能研究

Preparation of Bi-doped TiO_(2) Nanoparticles Based on Titanium Dioxide and Its Visible Light Photocatalytic Performance

以溶胶-水热-煅烧法制备Bi_(2)O_(3)-TiO_(2)纳米复合光催化剂,通过XRD、SEM、XPS、比表面积和紫外可见漫反射分析等技术对材料的结构和形貌进行表征。以甲基橙溶液为目标污染物,考察Bi_(2)O_(3)-TiO_(2)光催化氧化效果,研究铋掺杂量、煅烧温度对甲基橙染料降解率的影响。结果表明,相比TiO_(2),Bi_(2)O_(3)-TiO_(2)的平均晶体粒径更小;颗粒分布均匀,仅有少量松散团聚现象;Bi_(2)O_(3)-TiO_(2)存在介孔结构,有利于吸收污染物。在制备温度600℃条件下,Bi掺杂量为10%的Bi_(2)O_(3)-TiO_(2)纳米复合材料去除甲基橙的降解效果最优;在Bi掺杂量为10%时,Bi_(2)O_(3)-TiO_(2)的光催化降解效果随煅烧温度的增大而提高。

Bi_(2)O_(3)-TiO_(2)nanocomposite photocatalyst was prepared by sol-hydrothermal-calcination method.The structure and morphology of the material were characterized by XRD,SEM,XPS,specific surface area and UV-Vis diffuse reflectance analysis.Taking methyl orange solution as the target pollutant,the photocatalytic oxidation effect of Bi_(2)O_(3)-TiO_(2)was investigated,and the effects of bismuth doping amount and calcination temperature on the degradation rate of methyl orange dye were studied.The results show that the average crystal size of Bi_(2)O_(3)-TiO_(2)is smaller than that of TiO_(2);particle distribution is uniform,only a small amount of loose agglomeration phenomenon;Bi_(2)O_(3)-TiO_(2)has mesoporous structure,which is conducive to the absorption of pollutants.At the preparation temperature of 600℃,the Bi_(2)O_(3)-TiO_(2)nanocomposites with 10%Bi doping have the best degradation effect for methyl orange removal.When the doping amount of Bi is 10%,the photocatalytic degradation effect of Bi_(2)O_(3)-TiO_(2)increases with the increase of calcination temperature.