| La-Ce共掺杂制备La3+-Ce3+/ZnO及其对亚甲基蓝的光催化降解 |
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| 作者姓名： | 王爱华 车平 刘杰民 |
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| 作者单位： | 北京科技大学化学与生物工程学院, 北京 100083 |
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| 基金项目： | 中央高校基本科研业务费专项(FRF-TP-10-004B,FRF-BR-11-017B)国家自然科学基金资助项目(20877008,21277011)新世纪优秀人才支持计划资助项目(NCET-09-0218)国家高技术研究发展计划资助项目(2012AA030302) |
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| 摘 要： | 采用溶胶凝胶法制备了La-Ce共掺杂的La3+-Ce3+/ZnO光催化剂,同时用同种方法制备了ZnO、La3+/ZnO和Ce3+/ZnO以作对比.通过X射线衍射仪、透射电镜、紫外可见分光光度计,比表面及孔隙度分析仪等对制备的光催化剂进行了表征.以亚甲基蓝为模型污染物对所制备的光催化剂的光催化特性进行了评价.结果表明,所制备的La3+-Ce3+/ZnO光催化剂基本呈长方柱状,尺寸平均为57.3 nm,La-Ce共掺杂提高了ZnO的结晶度,促进了晶粒的长大.根据光催化实验结果,La-Ce共掺杂能够显著提高ZnO的光催化活性.在光催化降解500 mL的10 mg·L-1亚甲基蓝实验中,La3+-Ce3+/ZnO光催化剂对亚甲基蓝的降解率达93.7%,比纯ZnO、La3+-ZnO和Ce3+-ZnO分别提高了21.4%、19.2%和9.3%.
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| 关 键 词： | 氧化锌 掺杂 镧 铈 溶胶凝胶法 光催化 降解 |
| 收稿时间： | 2012-11-23 |
Preparation of (La-Ce)-codoped ZnO and its photocatalytic activity for degradation of methylene blue |
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| Affiliation: | School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | ZnO, La3+/ZnO, Ce3+/ZnO and La3+-Ce3+/ZnO photocatalysts were prepared by a sol-gel process and characterized by X-ray diffraction, transmission electron microscopy, ultraviolet and visible spectrophotometry, and BET specific surface area analysis. The photocatalytic activity of these photocatalysts was investigated by photodegradation of methylene blue (MB). The prepared La3+-Ce3+/ZnO photocatalyst is rectangular column shapes, with the average size of 57.3 nm. La-Ce codoping can increase the crystallinity of ZnO, promote the grain growth of ZnO, and improve the photocatalytic activity of ZnO greatly. In the photocatalytic degradation of 500 mL of 10 mg·L-1 MB, the photocatalytic degradation rate of MB with La3+-Ce3+/ZnO as a photocatalyst is 93.7%, which is 21.4%, 19.2%, 9.3% higher than those with pure ZnO, La3+-ZnO, Ce3+-ZnO as photocatalysts, respectively. |
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