水热合成纳米Bi_2WO_6粉末及其可见光催化活性  

Hydrothermal preparation of Bi_2WO_6 nano-powders as visible-light-driven photocatalysts

作　　者：姚三丽[1] 陈建林[1] 王仪春[1] 

机构地区：[1]南京大学环境学院,污染控制与资源化研究国家重点实验室,江苏南京210093

出　　处：《中国环境科学》2008年第3期242-245,共4页China Environmental Science

摘　　要：以Bi(NO3)3˙5H2O和Na2WO4˙2H2O为原料,水热合成纳米光催化剂Bi2WO6粉末.以偶氮染料直接耐酸大红4BS为目标污染物,通过XRD、TEM、BET和UV-visDRS等表征手段,考察了水热温度、反应物pH值以及煅烧对催化剂的可见光催化活性、晶型、粒径和比表面积等方面的影响.结果表明,140℃和原始pH值为0.57时水热合成的催化剂颗粒分散均匀,光催化效果最好,在光照150min后,对4BS的去除率为99.9%,其吸收边带达到470nm左右,带隙能约为2.7eV.Visible-light-driven Bi2WO6 photocatalysts were prepared by hydrothermal method. The effects of preparation and treatment methods on the structures and catalytic properties of Bi2WO6 photocatalyst were evaluated by the degradation of aqueous 4BS at room temperature under visible light irradiation. The obtained powders were characterized by XRD, TEM, BET and UV-vis spectroscopy. Bi2WO6, hydrothermally synthesized at 140℃ and initial pH 0.57 under ultrasonic dispersion exhibited the highest photocatalytic activity due to the good crystallization and high specific surface area. The removal of 4BS was 99.9% ofter illumination 150min.

关 键 词：Bi2WO6 水热合成 光催化 

分 类 号：X703.1[环境科学与工程—环境工程]