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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(TiO_2)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TiO_2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Ti O2(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。
Bismuth (Bi) doped mesoporous titania (TiO_2) photocatalyst was synthesized by solution impregnation method using mesoporous molecular sieve (KIT-6) as carrier. The structure and morphology of the material were characterized by XRD, TEM, SEM, XPS, N2 adsorption-desorption and Raman spectroscopy. The photocatalytic degradation efficiency of rhodamine B was investigated by UV-Vis absorption spectroscopy. The effect of the doping amount of Bi on the photocatalytic reaction rate was further investigated. The kinetics of photocatalytic degradation was also studied. The results show that the Bi-doped mesoporous TiO 2 has a narrow pore size distribution (3 ~ 4 nm), and the absorption range extends to the visible region. The photocatalytic activity of the Bi-doped mesoporous TiO 2 is obviously higher than that of the commercial product Ti O2 (P25). With the increase of Bi doping amount, the reaction rate constant also increases. The photocatalytic degradation of Rhodamine B is in accordance with quasi-first-order kinetic equation.