【摘要】 以聚合氯化铝(PAC)、氧氯化锆和己二酸等为原料合成了带有羧基功能基的铝锆偶联剂.借助傅里叶红外光谱、热重分析、X射线衍射、扫描电镜和粒度分布等测试方法对铝锆偶联剂及改性前后的纳米TiO2进行表征.对铝锆偶联剂表征的结果表明:己二酸分子中的一个羧基同时与铝和锆原子中心相连,另一羧基则作为偶联剂的功能基得以保留;铝锆偶联剂分子中无机部分所占比例高达71%.对利用铝锆偶联剂进行表面改性得到的纳米TiO2表征发现:铝锆偶联剂在纳米TiO2表面形成化学吸附,但此吸附并未对纳米TiO2的晶型产生影响;改性后的纳米TiO2在水中的分散性显著提高.更多还原

【Abstract】 Zircoaluminate coupling agent with carboxy groups was synthesized,with polyaluminium chloride,zirconium oxychloride and adipic acid,etc.,as the materials.The product and the nano-sized TiO2 before and after the surface modification were then characterized by means of FT-IR,TG-DTG,XRD,TEM and by measuring the size distribution.It is found that one carboxy group in adipic acid forms a complex bridge between the aluminum and the zirconium centers,while the other remains unchanged as the functional group of the coupling agent;and that the proportion of inorganic parts in the coupling agent is up to 71%.Moreover,as for the nano-sized TiO2 surface-modified with the coupling agent,there exists a chemical adsorption of the coupling agent on TiO2 surface,which has no effect on the crystalline form of nano-sized TiO2,and,the dispersion of the modified nano-sized TiO2 in water improves remarkably.更多还原