摘要
为探究液相还原法制备的纳米Fe/Co催化剂的类芬顿催化效果,以单因素分析法研究了pH、OTC(土霉素)初始质量浓度、H2O2摩尔浓度和催化剂用量对纳米Fe/Co催化剂催化性能的影响,并通过SEM(扫描电子显微镜)和BET(比表面积测试仪)对纳米Fe/Co催化剂进行表征,进一步研究了纳米Fe/Co催化剂对OTC模拟废水的催化降解效果.结果表明:①纳米Fe/Co催化剂可以有效地改善催化体系的pH使用范围,在pH为3.0~11.0范围内,纳米Fe/Co催化剂对浓度为100 mg/L OTC的去除率(94.0%)高于纳米Fe催化剂(85.0%);低浓度OTC有利于提高污染物的去除率,而高浓度的OTC有利于提高反应速率;H2O2摩尔浓度为200 mmol/L时,纳米Fe/Co催化剂对OTC的去除率最高(93.8%);纳米Fe/Co催化剂用量为6 g/L时,其对OTC的去除率最高(92.8%).②纳米Fe/Co催化剂粒径为20~30 nm,比表面积较高,为121.3 m^2/g.③纳米Fe/Co催化剂在重复利用13次后OTC去除率仍在50.0%以上,其重复利用性能良好.研究显示,纳米Fe/Co催化剂对OTC废水具有较好的催化性能、重复利用性能以及较宽的pH使用范围,可为含抗生素废水处理提供理论支撑.
In order to study the Fenton-like catalytic effect of Nano Fe/Co catalyst prepared by liquid phase reduction method,the effects of the initial pH value of the catalytic reaction,the initial concentration of oxytetracycline(OTC),the amount of H2O2 and the amount of catalyst on the catalytic performance of the Nano Fe/Co catalyst were studied by single factor analysis.Then,SEM(scanning electron microscope)and BET(brunauer emmett teller)were used to characterize the Nano Fe/Co catalyst and study the catalytic degradation of simulated OTC wastewater by the Nano Fe/Co catalyst.The results showed that:(1)The Nano Fe/Co catalyst could effectively widen the pH range of catalytic system.When the pH was between 3.0 and 11.0,the removal rate of 100 mg/L OTC(94.0%)by Nano Fe/Co catalyst was better than that of nanometer Fe catalyst(85.0%).Low OTC concentration was beneficial to improve the removal rate of pollutants,while high OTC concentration was conducive to raising reaction rate.When H2O2 dosage was increased to 200 mmol/L,the Nano Fe/Co catalyst achieved the optimal removal rate of OTC(93.8%).When the dosage of Nano Fe/Co catalyst reached 6 g/L,the catalyst achieved the optimal removal rate of OTC(92.8%).(2)The particle size of the Nano Fe/Co catalyst is 20-30 nm,and the specific surface area is 121.3 m^2/g.(3)When the Nano Fe/Co catalyst was reused for 13 times,its OTC removal rate reached more than 50.0%,showing its good reusability.The study found that the Nano Fe/Co catalyst had high catalytic performance and reusability for OTC wastewater,which could expand the range of reaction pH and provide theoretical support for the treatment of wastewater containing antibiotics.
作者
韩金栋
蒋进元
李君超
谭伟
谢鑫
洪尉淞
HAN Jindong;JIANG Jinyuan;LI Junchao;TAN Wei;XIE Xin;HONG Weisong(Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Chengdu University of Information Tchenology,Chengdu 610225,China;Chongqing Jiaotong University,Chongqing 400074,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2020年第10期2335-2341,共7页
Research of Environmental Sciences
基金
广西创新驱动发展专项资金项目(No.AA17202032)。
