以介孔分子筛(KIT-6)为载体,采用溶液浸渍法合成了铋(Bi)掺杂的介孔二氧化钛(TiO2)光催化剂.利用XRD、TEM、SEM、XPS、N2吸附-脱附法和拉曼光谱法等技术手段对材料的结构和形貌进行表征.通过紫外-可见吸收光谱法考察了催化剂对罗丹明B光催化降解效率,进一步考察了Bi的掺杂量对光催化反应速率的影响,并对光催化降解动力学进行了初步研究.结果表明,Bi掺杂的介孔TiO2具有较窄的孔径分布(3 ～4 nm),而且吸收范围扩展到可见光区,其光催化活性明显高于商品TiO2(P25).随之Bi掺杂量的提高,反应速率常数也增大,其光催化降解罗丹明B的反应均符合准一级动力学方程.
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