以钛酸丁酯为前驱体,以尿素为氮源,采用改进溶胶-凝胶法制备了不同N含量的改性TiO2光催化剂(N-TiO2).以重铬酸钾为目标污染物,以甲酸为空穴捕获剂,评价了可见光下该催化剂的催化还原活性.结果表明,N-TiO2催化剂活性明显高于未改性催化剂,当催化剂中N/Ti摩尔比为10%、焙烧温度为400℃时,其光催化还原活性最高.X射线衍射、X射线光电子能谱、傅里叶变换红外光谱和紫外可见漫反射吸收光谱等表征结果显示,于400℃焙烧时尿素分解生成了可起光敏化作用的氰尿酰胺.这可能是相应N-TiO2样品具有较高可见光活性的原因.
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