Abstract： To improve the lipophilicity and photocatalytic of TiO₂nano-powders, TiO₂ nano-particles prepared by sol-gel method were modified with γ-(methacryloyloxy) trimethoxysilane (MPS). Polyacrylamide(PAM) were grafted onto the surface of MPS-TiO₂ particles by in situ graft polymerization. The covalently bonded PAM -MPS -TiO₂composite 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 TiO₂ 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.

Keywords： titania; polyacrylamide; graft; surface modification

中图分类号：TQ134.1+ 1，O632.33 文献标志码：A

文章编号：1008-5548(2014)01-0047-04

DOI:10.3969/j.issn.1008-5548.2014.01.011

收稿日期：2013-06-24， 修回日期：2013-07-04，在线出版时间：2014-02-24。

基金项目：国家自然科学基金项目，编号：51272239；山西省留学基金项目，编号：2011-071。

第一作者简介：张华（1988—），女，硕士研究生，研究方向为纳米功能材料。 E-mail：zhonghuajueqi20100@163.com。

通信作者简介：李巧玲（1965—），女，博士，教授，研究方向为纳米功能材料。 E-mail：qiaolingl@163.com。