摘要
目的抗生素的大量使用和肆意排放给人类生存环境和身体健康带来极大危害。制备合理、有效、无二次污染的光催化剂是光催化处理抗生素废水技术的一种重要手段。方法采用溶胶-凝胶法制备掺杂Ge的改性Ge/TiO2催化剂,分析其在不同环境条件下对废水中环丙沙星(ciprofloxacin,CPLX)的光催化降解效果,探讨不同催化剂浓度、光源、光照时间、pH、水中共存离子Cl-、NO3-浓度,5个因素对环丙沙星降解率的影响。结果改性Ge/TiO2催化剂具有良好的光催化降解性能,反应符合L-H动力学方程,降解过程表现为伪一级反应。在紫外光下,环丙沙星初始浓度为10mg/L,pH为7.5,催化剂浓度1.5g/L,光照时间150min时,降解率最高。推测了改性Ge/TiO2催化剂光催化机理,反应基本发生在催化剂表面,降解环丙沙星过程主要是自由基反应。结论在最佳条件下,对环丙沙星降解率达到97.99%。
Objective The extensive use and wanton emission of antibiotics have brought great harm to the human living environment and physical health. The preparation of reasonable and effective photocatalyst without secondary pollution is an important means of photocatalytic treatment of antibiotic wastewater. Methods The modified Ge/TiO2 catalyst doped with Ge was prepared using the sol-gel method, and the photocatalytic degradation effects of ciprofloxacin (ciprofloxacin, CPLX) in waste water under different environmental conditions were analyzed. The concentration of different catalysts, light source, light time, pH, the concentrations of Cl- and NO3- coexistent in water were discussed, and five factors were applied to cyclopropyls and used to determine the effects on the degradation rates. Results The modified Ge/TiO2 catalyst had good photocatalytic degradation performance, and the reaction accorded with the L-H kinetic equation. The degradation process was pseudo first order reaction. Under UV light, the initial concentration of ciprofloxacin was 10mg/L, pH was 7.5, the catalyst concentration was 1.5g/L, and the highest degradation rate was achieved when light time was 150min. It is speculated that the photocatalytic mechanism of the modified Ge/TiO2 catalyst basically occured on the surface of the catalyst. The degradation of ciprofloxacin was mainly a radical reaction. Conclusion Under the optimum conditions, the degradation rate of ciprofloxacin reached 97.99%.
作者
杜晓晴
马秀兰
张婧
顾芳宁
由迪姝
孙萌
王继红
Du Xiao-qing;Ma Xiu-lan;Zhang Jing;Gu Fang-ning;You Di-shu;Sun Meng;Wang Ji-hong(Jilin Agricultural University, School of Resources and Environment, Changchun 130118)
出处
《中国抗生素杂志》
CAS
CSCD
2019年第8期993-998,I0001,共7页
Chinese Journal of Antibiotics
基金
吉林省科技厅重大科技专项(No.2018020101018SF)
