分别采用同相扩散法、浸渍法和溶胶.凝胶法制备了三种TiO<,2>/HZSM-5分子筛复合TiO<,2>光催化剂,在紫外光下考察其对NO<,2>的光催化氧化活性.利用XRD、UV-Vis表征催化剂结构,结果表明,制备方法是影响复合催化剂中TiO<,2>结晶度的重要因素,而对TiO<,2>的光吸收无显著影响.对NO<,x>光催化活性评价结果显示,固相扩散法和浸渍法制备的复合光催化剂的活性明显高于P25 TiO<,2>,其中国相扩散法制备的催化剂光催化活性最高,归因于其具有较高的TiO<,2>结晶度和混晶效应;相比P25,复合催化剂对中间产物NO<,2>的生成有明显的抑制作用.
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