纳米氧化铈催化辐照降解氧氟沙星  

Nano-CeO_2 Catalysis inγ-irradiation Degradation Ofloxacin

作　　者：张伟[1] 胡晓丹[1] 张海黔[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211106

出　　处：《南京航空航天大学学报》2015年第5期772-777,共6页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：江苏省自然科学基金(BK20131355)资助项目;江苏高校优势学科建设工程资助项目;南京航空航天大学基本科研业务费(NS2014055)资助项目

摘　　要：近年来氧氟沙星抗生素的滥用已成为日益严重的环境问题,γ辐照降解以其高效、快速、不产生二次污染等优点用于水环境中抗生素的降解。纳米氧化铈(CeO2)作为价廉且具有优异催化性能的稀土氧化物,可用于促进污染物的γ辐照降解。本文制备了纳米CeO2,以其作为催化剂辐照降解氧氟沙星,并对降解产物进行分析,探讨了CeO2对氧氟沙星(Ofloxacin,OFX)的催化降解机理。研究结果表明,分散性好、形貌规整的CeO2纳米粒子具有较好的催化效用,加入纳米CeO2后,在2kGy的辐照剂量下降解率可达99%,明显优于未加催化剂的效果。同时通过对比发现,CeO2的催化性能优于H2O2。最后通过液-质联用(Liquid chromatography-mass spectrometer,LC-MS)分析技术推断出氧氟沙星抗生素羟基的进攻降解途径。Ofloxacin（OFX）has increasingly become a serious environmental problem.Because of high-efficiency,high-speed and no secondary pollution,theγ-irradiation is used in the degradation of antibiotic in water environment.Nanostructure-CeO2,which is inexpensive and has excellent catalytic performance,can be used to promote theγ-irradiation degradation of pollutants.The degradation products of OFX and the catalytic mechanism of CeO2 are analyzed.The result shows that the degradation rate can reach 99%in 2kGyγ-irradiation dose after adding CeO2,obviously better than that without catalyst.And by contrast,it is found that the catalyst performance of CeO2 is better than that of H2O2.Finally,the degradation products and the hydroxyl attack reaction pathway of OFX are researched by the liquid chromatography-mass spectrometer（LC-MS）method.

关 键 词：纳米氧化铈 辐照降解 氧氟沙星 

分 类 号：O69[理学—化学]