TiO2/膨润土纳米复合光催化剂降解偶氮染料的研究

被引:55
作者
孙振世
陈英旭
柯强
杨晔
袁骏
机构
[1] 浙江大学环境工程系
[2] 浙江大学国家硅材料重点实验室
关键词
膨润土; 光催化; 偶氮染料; 催化活性; 纳米复合物;
D O I
10.13671/j.hjkxxb.2003.01.025
中图分类号
X788 [染料、颜料与涂料工业];
学科分类号
摘要
采用酸性溶胶法合成TiO2 膨润土纳米复合光催化剂 ,并研究其光催化降解阳离子偶氮染料 .X射线衍射 (XRD)分析表明 ,TiO2 膨润土纳米复合物的d0 0 1衍射角为 9 0 6° .该复合催化剂具有较高的光催化降解有机污染物的活性 ,随着光照时间的延长 ,阳离子红GTL的特征峰 490 5nm强度逐渐减弱 ,最后它的特征峰可彻底消失 ,GTL的偶氮键是最活跃的化学键 ,它易于被氧化断键 .该复合催化剂的催化活性受溶液的pH影响较大 ,在中性和碱性条件下其光催化活性更强 .适量的过氧化氢可以加速光催化氧化反应 ,但过量的H2 O2 却抑制了羟基自由基的生成 ,从而使H2 O2 的利用效率下降 ,在本实验条件下其最佳用量是 6mmol L .
引用
收藏
页码:129 / 133
页数:5
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