硅烷化溶剂对TiO_2/Fe-MCM-41复合光催化剂吸附性能的影响  

Effect of Solution in Silylanization on the Adsorbability of TiO_2/Fe-MCM-41 Composite Photocatalyst

作　　者：徐华胜[1] 陈锋[1] 马宏燎[2] 柏子龙[2] 张金龙[1] 

机构地区：[1]华东理工大学精细化工研究所,上海200237 [2]华东理工大学石油加工研究所

出　　处：《华东理工大学学报（自然科学版）》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)

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.

关 键 词：Fe—MCM-41 硅烷化 TIO2 吸附性 光催化剂 

分 类 号：O643[理学—物理化学]