Photocatalytic Activity of LaSr2AlO5:Eu Ceramic Powders
Photocatalytic Activity of LaSr2AlO5:Eu Ceramic Powders
复制标题
DOI：
10.1111/php.12428
复制
发表时间：
2015-05-01
影响因子：
3.3
通讯作者：
Diaz-Torres, Luis A.
中科院分区：
文献类型：
--
作者：
Garcia, Carlos R.;Oliva, Jorge;Diaz-Torres, Luis A.
以亚甲基蓝染料为降解对象，研究了未掺杂和掺铕LaSr 2AlO 5粉体的光催化活性。这些粉末通过燃烧法和空气中的退火处理制备。X射线衍射（XRD）结果表明，所有样品均为四方晶系单相。扫描电子显微镜（SEM）显示不规则的半椭圆形颗粒，尺寸在3.5- 4.27 μ m的范围内。在322 nm的紫外光激发下，荧光光谱在588 nm和617 nm处有尖锐的发射峰，分别对应于F-7（1），F-7（2）D-5（0）Eu ~（3+）离子的禁戒跃迁。通过监测亚甲基蓝（MB）在665 nm处的吸收峰的变化，研究了紫外光（254 nm）下MB的降解。最后，LaSr 2AlO 5：Eu粉末被使用三次，并且在第三次使用循环之后，MB的降解效率从100%下降到61%。
The photocatalytic activity, of undoped and Europium-doped LaSr2AlO5 powders, has been investigated by degrading methylene blue dye in water solutions. Those powders were fabricated by a combustion method and an annealing treatment in air. All samples showed a tetragonal single phase according to by X-ray diffraction measurements (XRD). Scanning electron microscopy (SEM) revealed irregular semi-oval grains with sizes in the range of 3.5-4.27m. Photoluminescence spectrum showed sharp emission peaks at 588nm and at 617nm which are associated with F-7(1),F-7(2) D-5(0) Eu3+ ion forbidden transitions, respectively, under UV light excitation of 322nm. The methylene blue (MB) degradation under UV light (254nm) was studied by monitoring changes in the absorbance peak of MB at 665nm. Finally, LaSr2AlO5:Eu powders were used three times and the efficiency for the degradation of MB decreased from 100 to 61% after the third cycle of use.