水热-煅烧法制备BiNbO4及其光催化性能研究  

Preparation of BiNbO4 by hydrothermal-calcination method and its photocatalytic performance

作　　者：赵洁[1] 吴飞 张晓龙 宋强 冯亚伟 ZHAO Jie;WU Fei;ZHANG Xiaolong;SONG Qiang;FENG Yawei(School of Science,Xi’an University of Technology,Xi’an 710054,China)

机构地区：[1]西安理工大学理学院,陕西西安710054

出　　处：《西安理工大学学报》2020年第1期10-16,32,共8页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(21706207)。

摘　　要：本文提出一种水热-煅烧法合成BiNbO4的新方法。以Bi(NO3)3·5H2O和NbCl5为原料,用水热法(pH=9,220℃,24 h)制得前驱体Bi5Nb3O15,再将其于800℃煅烧3 h制得α-BiNbO4,于1 040℃煅烧3 h制得β-BiNbO4。通过XRD,UV-vis DRS,TG-DTA,SEM和BET等技术对样品进行表征和分析,探讨了水热温度和煅烧温度对BiNbO4催化剂晶型结构的影响。以沙拉沙星为降解模型比较了α-BiNbO4和β-BiNbO4的光催化性能,发现α-BiNbO4的光催化性能优于β-BiNbO4的光催化性能。研究了α-BiNbO4光催化降解沙拉沙星的条件及性能。结果表明,在250 W氙灯180 min的照射下,催化剂用量为2.0 g/L,沙拉沙星浓度为10 mg/L,溶液pH值为3.0时,沙拉沙星的降解率可达97.37%。α-BiNbO4在各条件下降解沙拉沙星过程均符合一级动力学模型。Using Bi(NO 3)3·5H 2 O and NbCl 5 as raw materials,α-BiNbO 4 andβ-BiNbO 4 are synthesized by the hydrothermal-calcination method.The samples are characterized and analyzed by XRD,UV-vis DRS,TG-DTA,SEM and BET techniques.The effect of hydrothermal temperature and calcination temperature of BiNbO 4 on crystal structure is discussed;antibiotic sarafloxacin is selected as the degradation target;photocatalytic performances ofα-BiNbO 4 andβ-BiNbO 4 are compared;the effects ofα-BiNbO 4 dosage,sarafloxacin concentration and pH value on the photocatalytic performances are studied.The results show that the degradation rate of sarafloxacin reaches 97.37%under 250 W Xenon irradiation within 180 minutes,while the amount of catalyst is 2.0 g/L,the concentration of sarafloxacin 10 mg/L,and solution pH value 3.0.The degradation process is fitted to the first kinetic model under different conditions.

关 键 词：光催化 BINBO4 水热-煅烧法 降解 沙拉沙星 

分 类 号：O643[理学—物理化学]