中文摘要：

为了提高纳米TiO2粉体的亲油性和光催化性,采用溶胶-凝胶法制得纳米TiO2粉体,经γ-（甲基丙烯酰氧）丙基三甲氧基硅烷（MPS）改性后,通过聚丙烯酰胺（PAM）在MPS-TiO2粉体表面进行原位接枝聚合,制得基于共价键结合的PAM-MPS-TiO2复合光催化剂,采用红外光谱、扫描电镜、X射线衍射、分散性实验和光催化实验等分析手段对改性前后的TiO2粉体进行表征.结果表明,改性后TiO2粉体的亲油性显著增强;在有机溶剂中的团聚现象减少,分散性提高;与纯TiO2粉体相比,MPS-TiO2粉体表现出较高的光催化活性,PAM-MPS-TiO2粉体次之,经紫外光照2h,二者均可将甲基橙几乎完全降解去除.

英文摘要：

To improve the lipophilicity and photocatalytic of TiO2 nano-powders, TiOz nano-particles prepared by sol-gel method were modified with γ- （methacryloyloxy） trimethoxysilane （MPS）. Polyacry- lamide （PAM） were grafted onto the surface of MPS-TiO2 particles by in situ graft polymerization. The covalently bonded PAM-MPS-TiOz composite photocatalysts were prepared. The samples were characterized by IR, SEM, XRD, dispersion experiments and photocatalytic experiments. The results show that the modification of TiO2 powders can significantly enhance the lipophilicity. The agglomeration in an organic solvent is reduced and the dispensability is improved. Comparing with pure TiO： powders, the photocatalytic activity of MPS-TiO2 powders is higher, PAM-MPS-TiO2 powders follows. After illuminating 2 h by ultraviolet, methyl orange can almost be degradated completely by the 2 kinds of photocatalysts.