硅酸盐学报

Gd掺杂锐钛矿型TiO2光催化剂的制备及降解苯甲羟肟酸活性

作者：祝思频1 2 王春英1 2 3 王俊蔚1 2 罗仙平1 2 3

单位：1. 江西理工大学资源与环境工程学院江西赣州 341000 2. 江西省矿冶环境污染控制重点实验室江西赣州 341000 3. 西部矿业股份有限公司博士后科研工作站西宁 810000

分类号：X703.1

出版年,卷(期):页码：2017,45(10):0-0

DOI：

摘要：

以溶胶?凝胶法制备了不同煅烧温度及不同Gd掺杂量的TiO2(TiO2:x%Gd)粉末。对改性前后TiO2结构和性能进行了表征，研究了Gd掺杂TiO2粉末在紫外光下对苯甲羟肟酸的光催化性能。结果表明：相比纯TiO2，适量Gd掺杂使TiO2的光吸收强度增大、粒径减小且比表面积增大。掺杂后的TiO2粉末具有很高的光催化活性，500 ℃煅烧的TiO2:0.70%Gd催化剂光催化活性最佳，室温下300 W汞灯照射120 min后，对苯甲羟肟酸的降解率高达94.7%。总有机碳(TOC)测试显示，加入TiO2:0.70%Gd后，苯甲羟肟酸矿化率达79.3%，苯甲羟肟酸降解后可能转化为有机小分子物质及无机CO2和NO3−等。此外，Gd掺杂TiO2重复使用4次后，苯甲羟肟酸的光催化降解率无明显降低，表明稀土Gd掺杂TiO2是一种有效稳定的光催化剂。

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