CeO2/BiOBr/CNTs催化剂的制备及其降解抗生素性能研究
Preparation of CeO2/BiOBr/CNTs catalysts and their performance in antibiotics degradation
李友凤 1方程 1陈林羽 1唐彩霞 1吕国玲 1肖菡曦1
作者信息
- 1. 遵义师范学院化学化工学院,贵州 遵义 563000
- 折叠
摘要
采用水热法合成了CeO2、CeO2/BiOBr、CeO2/CNTs和CeO2/BiOBr/CNTs复合纳米材料催化剂,利用XRD、SEM、BET和UV-Vis等方法对材料的结构、形貌和织构特性进行表征.在长弧氙灯照射下模拟太阳可见光降解抗生素,研究复合纳米材料的光催化氧化性能.结果表明,CeO2 与BiOBr、CNTs间的协同作用导致其对土霉素降解效果优于CeO2;CeO2/BiOBr/CNTs对抗生素和可见光具有更高的吸收性能,比CeO2/BiOBr和CeO2/CNTs有更高的降解效率.在弱碱性环境下生成活性基团·OH,复合材料催化效果较好.复合材料禁带宽度都在可见光范围内,CeO2 的复合提高了材料的光利用效率,增强了材料的吸附性和电子-空穴对的迁移效率,进而提高其光催化活性.回收脱附实验表明,CeO2/BiOBr/CNTs复合材料具有较好的稳定性.
Abstract
CeO2,CeO2/BiOBr,CeO2/CNTs and CeO2/BiOBr/CNTs nano composite catalysts are synthesized via a hydrothermal method.The structure,morphology,and texture characteristics of as-prepared nano composite are characterized by means of XRD,SEM,BET and UV-Vis methods.Their performances in photocatalytic degradation of antibiotics are studied under the irradiation of long arc xenon lamp.It is indicated by the results that both CeO2/BiOBr and CeO2/CNTs exhibit a better degradation effect on antibiotics than CeO2 because of the synergistic effect between CeO2 and BiOBr,CeO2 and CNTs.CeO2/BiOBr/CNTs displays higher absorption performance for antibiotics and visible light,and delivers higher degradation efficiency than CeO2/BiOBr and CeO2/CNTs.The·OH active groups generate in weakly alkaline environment,resulting in a good catalytic effect of the as-prepared composite.Band gap widths of the composite are all within the visible light range.The addition of CeO2 helps the composite to improve its light utilization efficiency,enhancing its adsorption and electron hole pair migration efficiency,thereby increasing its photocatalytic activity.It is shown through the recovery desorption experiment that CeO2/BiOBr/CNTs composite has good stability.
关键词
CeO2/BiOBr/CNTS/复合纳米材料/光催化降解/抗生素/催化剂机理Key words
CeO2/BiOBr/CNTs/nano composites/photocatalytic degradation/antibiotics/catalyst mechanism引用本文复制引用
基金项目
国家自然科学基金(52166008)
遵义师范学院服务地方产业革命项目(遵师CXY[2021]01号)
遵师博士启动基金(遵师BS[2018]12号)
出版年
2024
NETL
NSTL
万方数据