花状钨酸铋纳米粉体的制备及其光催化性能研究

Preparation of Petaloid Bismuth Tungstate Nano Photocatalyst and Its Catalytic Activity

文章以Na2WO4·2H2O和Bi(NO3)3·5H2O为原料,采用简单水热合成法制备了具有三维花瓣状结构的Bi2WO6光催化剂,并利用SEM和XRD等方法对光催化剂的形貌和结构进行了表征。考察了反应时间、Bi2WO6加入量、染料罗丹明B的初始浓度和光强对罗丹明B光催化降解效果的影响。实验结果表明,160℃下24 h水热合成的Bi2WO6光催化剂,以氙灯(不加滤光片)为光源,在500 W下光照60 min,对浓度为4.79 mg/L的罗丹明B溶液的去除率最高可达94.6%。由此可见水热合成的花瓣状Bi2WO6具有较高的光催化活性,在光催化降解染料废水方面具有潜在的应用价值。

In the work, Bi2WO6 photocatalyst with three dimensional flower structure was synthesized by simple hydrothermal method, using Na2WO4·2H2O and Bi（NO3）3·5H2O as raw materials. The structure and morphology of Bi2WO6 photocatalyst were characterized by SEM and XRD. The influence of reaction time, Bi2WO6 dosage, initial concentration of Rhodamine B and light intensity were studied. The experiment showed that taking Xenon lamp （without filter） as the light source and irradiation for 60 rain under the light intensity 500 W, has a high removal rate, up to 94.6 % for Rhodamine B whose concentration is 4.79 mg,%. Thus, the petaloid Bi2WO6 by hydrothermal method has high catalytic activity, which has potential application value in the photocatalytic degradation of dye wastewater.