利用贵金属修饰氧化钛被认为是提高氧化钛光催化效率的重要途径.本文提出了一种新的制备方法,利用紫外光诱导还原作用,在水相体系中不使用表面活性剂合成Ag修饰TiO2纳米结构.首先,Ti(SO4)2水解能得到分散良好的锐钛矿相TiO2纳米棒.在TiO2纳米棒合成过程中,利用紫外光的诱导还原作用即可得到Ag/TiO2纳米结构.透射电镜显示Ag修饰TiO2纳米结构是由20～·30nm的TiO2纳米棒和10nm左右的Ag“纳米头”组成.对亚甲基蓝的光降解实验证明,Ag/TiO2纳米结构相比纯TiO2在可见光和模拟太阳光下光催化性能分别提高了31倍和3倍.因此,此法合成的Ag/TiO2可被开发用作降解污染物的有效催化剂.
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