铋-镧复合氧化物的制备与光催化活性  

Preparation and Photocatalytic Performance of Lanthanum-Bismuth Composite Oxide

作　　者：邓洪权[1] 唐亭[1] 符纯华[2] 蒋琪英[1] 胡亚敏[1] 霍冀川[1] 

机构地区：[1]西南科技大学材料学院,四川绵阳621010 [2]四川理工学院机械工程学院,四川自贡643000

出　　处：《环境科学与技术》2013年第7期121-124,共4页Environmental Science & Technology

基　　金：四川省过程装备与控制工程重点实验室基金(GK201002);西南科技大学基金(12xnkf11)

摘　　要：以同时含La(Ⅲ)和B(iⅢ)的双金属配合物BiLa(dtpa)(NO3).3.5H2O为前驱体,通过500℃的热分解制得铋-镧复合氧化物Bi0.775La0.225O1.5,并利用XRD、SEM和UV-Vis漫反射等分析手段研究灼烧时间对样品的结构及光吸收特性的影响。以甲基橙模拟废水的光催化降解为模型,研究不同灼烧时间对铋-镧复合氧化物光催化活性的影响。结果表明,热分解所得铋-镧复合氧化物样品呈疏松多孔结构,对光具有较宽的吸收范围,在紫外光区具有较好的光催化活性,灼烧时间影响样品的粒径和形貌以及光催化效果,在20 mg/L甲基橙溶液中添加灼烧1 h和4 h所得的催化剂样品1 g/L,光照4 h后甲基橙褪色率分别达95%和91%。Bi-La composite oxide was prepared by thermal decomposition of molecular precursor of BiLa（diethylene triaminepentaacetic）（NO3）.3.5H2O at 500 ℃.Effect of calcination time on structure and photocharacter was studied by X-ray powder diffraction,scanning electron microscopy and UV-Vis diffuse reflectance spectroscopy.The photocatalytic performance of Bi-La composite oxide was discussed through the degradation of methyl orange wastewater under UV light irradiation.Results showed that sample calcined at 500 ℃ is a composite oxide compound of Bi0.775La0.225O1.5 with porous structure and photocatalytic activity of samples as-prepared was influenced by calcinations time.The samples calcined for 1h and 4h exhibit good photocatalytic activity.The degradation rates of methyl orange of 20 mg/L over prepared samples of 1 g/ L calcinated for 1h and 4h under UV-light irradiation for 4h were 95% and 91% respectively.

关 键 词：铋-镧 复合氧化物 光催化活性 甲基橙废液 

分 类 号：X703[环境科学与工程—环境工程]