掺杂型稀土双钙钛矿光催化剂La2FeTiO6葡萄糖络合法制备与表征  

Preparation and Characterization of Doped Rare Earth Double Perovskite-Type Photocatalyst La_2FeTiO_6 by Glucose Complex Method

作　　者：胡瑞生[1] 谭立志[1] 王欣[1] 孙艳[1] 胡佳楠[1] 赵文岩[1] 

机构地区：[1]内蒙古大学化学化工学院,稀土材料化学与物理重点实验室,内蒙古呼和浩特010021

出　　处：《中国稀土学报》2012年第5期550-555,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(21166015);内蒙古大学“211工程”创新人才培养项目(2-1.2.1-083)资助

摘　　要：采用葡萄糖络合法制备了双钙钛矿型催化剂La2FeTiO6,进行不同量Sr掺杂改性。利用X射线粉末衍射(XRD)、H2-程序升温还原(H2-TPR)、比表面(BET)、扫描电镜(SEM)、磁性与电性测试等手段对其进行表征,以可见光催化降解对氯苯酚为探针讨论了Sr掺杂对La2FeTiO6催化剂的物理化学性质及可见光催化活性的影响。结果表明:催化剂La2FeTiO6在掺杂Sr后,催化剂的可见光催化活性均有所提高,其中Sr掺杂量为0.08时,催化剂的光催化活性提高最大,光照1 h时对氯苯酚的降解率就已经达到了90%,5 h后降解率达到99.2%。La2FeTiO6通过Sr掺杂改性后光照5 h降解率提高了37.1%。比表面测试和程序升温还原试验结果表明,碱土金属Sr的掺杂提高了催化剂的比表面,促进了双钙钛矿La2FeTiO6中Fe的还原,使其还原峰面积增大,还原温度也有所降低。电性和磁性测量结果说明,碱土金属Sr的掺杂明显影响其催化剂的电磁性能。Double perovskite-type catalyst La2FeTiO6 was prepared by the sol-gel method using glucose as complex agent. It was doped with Sr and modified. The catalyst was characterized by X-ray powder dif- fraction （XRD）, H2-temperature-programmed reduc- tion （H2-TPR）, specific surface area （BET）, scan- ning electron microscopy （SEM） , magnetic measure- ments and conductivity. The physical and chemical properties and the photocatalytie activities of those cat- alysts were evaluated for photoeatalytic degradation of p-chlorophenol. The results showed that the activities of the catalyst under visible light were all enhanced, and the increase of the activity was the most when the amount of Sr doping was 0.08. After 1 h, the degra- dation percentage of p-chlorophenol reached 90% , af- ter 5 h it was 99.2%, which was 37.1% higher than the activity of pure La2FeTiO6. The results of BET and TPR indicated that La2FeTiO6 samples doped with Sr had larger specific surface, and decreased the re- duction temperature but increased the reduction peak area. The results of magnetic measurements and con- ductivity showed that the electromagnetic properties of samples doped with Sr were obviously improved. Meanwhile, the results demonstrated that the photocat- alytic activities of samples corresponded with their electromagnetic properties.

关 键 词：双钙钛矿 光催化 对氯苯酚 稀土 

分 类 号：O643.36[理学—物理化学]