采用二次嫁接的方法,将Keggin结构的缺位钨磷酸盐PW11嫁接到介孔TiO2的表面,得到PW11/TiO2 杂化样品.采用IR、低温N2吸附、XRD、TEM和ICP-AES等对样品的结构、PW11负载量以及键联机理进行了表征和研究,对样品光催化降解甲基橙的性能进行了考察.结果显示,用蒸发诱导自组装法合成的TiO2,焙烧前结构松散,可部分水解并与PW11反应,生成PW11Ti物种,后者与TiO2骨架缩合,从而实现PW11的键联嫁接.与纯TiO2相比,杂化样品中锐钛矿相的结晶度稍有降低,孔径、孔容减小,但是对甲基橙的光催化降解活性却明显增加,显然这是PW11和TiO2间发生了“协同效应”所致.
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