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环境化学  2015 

钒-氮共掺杂TiO2的合成、表征及光催化性能

Keywords: 二氧化钛,光催化,掺杂改性,,

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Abstract:

以偏钒酸铵作为钒源、二乙醇胺作为氮源,采用溶胶-凝胶法合成了钒-氮共掺杂TiO2.通过XRD、UV-Vis、TEM、XPS、BET等表征手段,对光催化剂的晶体结构及形貌、紫外可见光响应特性、比表面积、表面元素及存在形式进行分析,探讨钒氮共掺杂TiO2的影响机制.以苯酚为污染物,评价其在紫外光及可见光下的光催化活性.结果显示,所合成的光催化剂均为锐钛矿,钒氮共掺杂能够增大其比表面积,并使光吸收范围拓展至可见光区,N以O-Ti-N、Ti-O-N结构存在于钒氮共掺杂TiO2中,V以V5+的形式存在,钒-氮共掺杂TiO2在紫外光下对苯酚降解速率是TiO2的3.18倍,在可见光下对苯酚的降解速率为TiO2的2.56倍,重复使用7次后,钒-氮共掺杂TiO2对苯酚的降解率仍可以达到99%以上.

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