摘要
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。
TiO2 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 N2 adsorption/desorption isotherms were used to characterize the TiO2-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 TiO2 nanoparticles.
出处
《华东理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第3期334-338,共5页
Journal of East China University of Science and Technology
基金
国家自然科学基金项目(20407007)
上海市纳米专项基金(0452nm010)
教育部新世纪优秀人才支持计划(NCET-04-0414)
