摘要
采用一步水热法与两步水热法制备了GQDs/Bi2WO6(GQDs为石墨烯量子点)复合材料,利用氙灯为光源,考察了暗反应与光反应条件下GQDs/Bi2WO6对目标污染物环丙沙星的吸附性能与光催化性能,并对所制备的部分材料进行了表征。实验结果表明,相比于纯Bi2WO6,一步法制备的0.20GQDs/Bi2WO6(柠檬酸CA与Bi2WO6物质的量比为0.2)和两步法制备的2%GQDs/Bi2WO6(GQDs与Bi2WO6的质量比为2%)有着相对更好的吸附性能与光催化性能。其中,0.20GQDs/Bi2WO6光催化效果最好。暗反应30min后,环丙沙星吸附去除率为50.4%。光反应60min后,环丙沙星的光催化去除率为42.6个百分点,总去除率达93.0%。表征结果显示,0.20GQDs/Bi2WO6的比表面积最大,且光生空穴和电子复合概率也相对较低。
GQDs/Bi2WO6(GQDs as graphene quantum dots)composites were prepared by one-step hydrothermal method and two-step hydrothermal method.Using xenon lamp as light source,the adsorption and photocatalytic properties of GQDs/Bi2WO6 to targeted pollutant ciprofloxacin were investigated under dark and light conditions,and some of the prepared materials were characterized.Compared with pure Bi2WO6,0.20GQDs/Bi2WO6(the mole ratio of citric acid CA to Bi2WO6 is 0.2)prepared by one-step method and 2%GQDs/Bi2WO6(the mass ratio of GQDs to Bi2WO6 is 2%)prepared by two-step method have better adsorption and photocatalytic properties.The photocatalytical effect of 0.20GQDs/Bi2WO6 was the best with 50.4%of ciprofloxacin removal rate after 30 min of dark adsorption,42.6 percetage points of ciprofloxacin removal rate after 60 min of photocatalytic reaction and 93.0%of the total removal rate.The characterization results show that the specific surface area of 0.20GQDs/Bi2WO6 is the largest,and the recombination probability of photo-generated holes and electrons is relatively low.
作者
龙菲妃
莫创荣
胡文科
方译晨
黄业翔
黄俊霖
LONG Feifei;MO Chuangrong;HU Wenke;FANG Yichen;HUANG Yexiang;HUANG Junlin(School of Resource,Environment and Materials,Guangxi University,Nanning 530004,China)
出处
《化工环保》
CAS
CSCD
北大核心
2019年第5期586-591,共6页
Environmental Protection of Chemical Industry
关键词
石墨烯量子点
钨酸铋
一步水热法
两步水热法
吸附
光催化
环丙沙星
graphene quantum dot
barium tungstate
one-step hydrothermal method
two-step hydrothermalmethod
adsorption
photocatalysis
ciprofloxacin
