摘要
采用水热法合成了CeO_(2)、CeO_(2)/BiOBr、CeO_(2)/CNTs和CeO_(2)/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,CeO_(2)与BiOBr、CNTs间的协同作用导致其对土霉素降解效果优于CeO_(2);CeO_(2)/BiOBr/CNTs对抗生素和可见光具有更高的吸收性能,比CeO_(2)/BiOBr和CeO_(2)/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,CeO_(2)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,CeO_(2)/BiOBr/CNTs复合材料具有较好的稳定性。
CeO_(2),CeO_(2)/BiOBr,CeO_(2)/CNTs and CeO_(2)/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 CeO_(2)/BiOBr and CeO_(2)/CNTs exhibit a better degradation effect on antibiotics than CeO_(2) because of the synergistic effect between CeO_(2) and BiOBr,CeO_(2) and CNTs.CeO_(2)/BiOBr/CNTs displays higher absorption performance for antibiotics and visible light,and delivers higher degradation efficiency than CeO_(2)/BiOBr and CeO_(2)/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 CeO_(2) 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 CeO_(2)/BiOBr/CNTs composite has good stability.
作者
李友凤
方程
陈林羽
唐彩霞
吕国玲
肖菡曦
LI You-feng;FANG Cheng;CHEN Lin-yu;TANG Cai-xia;LV Guo-ling;XIAO Han-xi(School of Chemistry and Chemical Engineering,Zunyi Normal University,Zunyi 563000,China)
出处
《现代化工》
CAS
CSCD
北大核心
2024年第5期122-127,134,共7页
Modern Chemical Industry
基金
国家自然科学基金项目(52166008)
遵义师范学院服务地方产业革命项目(遵师CXY[2021]01号)
遵师博士启动基金项目(遵师BS[2018]12号)。
