硅烷化溶剂对TiO2/Fe-MCM-41复合光催化剂吸附性能的影响

在不同条件下用KH-550硅烷偶联剂对介孔分子筛Fe—MCM-41表面进行化学修饰后，以Fe—MCM-41分子筛为载体负载TiO2纳米溶胶。实验发现在硅烷化处理时，选择不同极性的溶剂对复合光催化剂的吸附性能有显著影响。利用XRD，固体漫反射UV—Vis吸收光谱，FT—IR，低温N2吸附-脱附等对分子筛进行了表征。结果表明：在不同的溶剂中，Fe—MCM-41分子筛在KH-550化学修饰时硅烷化程度不同。与无水乙醇等极性较强的溶剂所制的样品相比，正己烷为溶剂的TiO2—Fe—MCM-41正己烷样品具有更强的吸附能力，对TiO2纳米粒子具有更好分散能力。

Effect of Solution in Silylanization on the Adsorbability of TiO2/Fe-MCM-41 Composite Photocatalyst

TiO_2 nanoparticles were loaded on the Fe-MCM-41 mesoporous molecular sieves after the surface chemical modification of Fe-MCM-41 with KH-550 under different conditions. It was found that the polarities of the solvents in the silylanization have great influences on the adsorbability of photocatalyst composite. X-ray diffraction (XRD), diffuse reflectance ultra-violte-visible spectrum (UV-Vis), Fourier transform infrared spectrum (FT-IR) and N_2 adsorption/desorption isotherms were used to characterize the TiO_2-Fe-MCM-41 composite. It was shown that Fe-MCM-41 has different silylanization extent with KH-550 in the different solvents. Comparing with those modified in polar solvents, the composite modified in hexane has much stronger adsorbability and better dispersive ability to TiO_2 nanoparticles.