氮掺杂石墨烯对水中微量磺胺甲恶唑的吸附特性  

Adsorption Characteristics of Nitrogen-doped Graphene to Trace Sulfamethoxazole in Water

作　　者：吴楠[1,2,3] 张雪 李彦娟 王三反[1,2,3] WU Nan;ZHANG Xue;LI Yan-juan;WANG San-fan(Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Engineering ResearchCenter for Cold and Arid Regions Water Resource Comprehensive Utilization,Ministry of Education,Lanzhou 730070,China;School of Petrochemical Engineering,Lanzhou Petrochemical University of Vocational Technology,Lanzhou 730060,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州交通大学甘肃省黄河水环境重点实验室,兰州730070 [2]兰州交通大学环境与市政工程学院,兰州730070 [3]兰州交通大学寒旱地区水资源综合利用教育部工程研究中心,兰州730070 [4]兰州石化职业技术大学石油化学工程学院,兰州730060 [5]兰州理工大学土木工程学院,兰州730050

出　　处：《兰州交通大学学报》2022年第2期108-117,共10页Journal of Lanzhou Jiaotong University

基　　金：甘肃省科技计划(20JR2RA002);甘肃省黄河水环境重点实验室开放基金(21YRWEG004)。

摘　　要：抗生素作为一种典型的新型污染物已经引起人们极大关注但尚未被有效管控,常规的水处理工艺对此类污染物处理效果不佳.以磺胺甲恶唑(SMZ)为目标污染物,通过设计氮掺杂石墨烯(N-rGO)研究其对水中微量抗生素的吸附性能,在此基础上构建“吸附-催化氧化”体系以提高对抗生素的处理效果.结果表明:N-rGO在60 min内完成吸附过程,去除率为87.3%,吸附过程更加符合一级动力学方程.温度升高不利于吸附过程的进行,吸附过程符合Langmiur等温吸附模型,说明吸附过程中单分子层发挥着重要作用,理论最大吸附容量为574.71 mg/g,同时热力学分析结果表明吸附过程为自发进行的放热反应.N-rGO对SMZ的吸附最佳pH值为7左右,且模拟研究表明天然水基质中的阴阳离子不会抑制吸附过程,但是腐殖酸对吸附效果造成了不利影响.表征结果表明N-rGO表面褶皱较多,同时含有丰富多样的含氧官能团,这些结构特征为高效吸附的进行提供了条件.结果显示N-rGO能够对水中微量存在的抗生素进行快速有效的吸附,为“吸附-催化氧化”体系的构建与调控提供了基础,有利于下一步研究的继续进行.Antibiotics,as a typical new pollutant,have attracted great attention but have not yet been effectively controlled.Conventional water treatment processes are not effective in treating such pollutants.Taking sulfamethoxazole(SMZ)as the target pollutant,nitrogen-doped graphene(N-rGO)is designed to study its adsorption performance for trace antibiotics in water,and on this basis,an"adsorption-catalytic oxidation"system is constructed to improve the treatment effect of antibiotics.The results showed that N-rGO can complete the adsorption process within 60 min,with a removal rate of 87.3%,and the kinetics showed that the adsorption process was more consistent with the first-order kinetic equation.The increase in temperature is not conducive to the progress of the adsorption process.The adsorption process conforms to the Langmuir isotherm model,indicating that the monolayer plays an important role in the adsorption process,and the theoretical maximum adsorption capacity is 574.71 mg/g.Meanwhile,the thermodynamic analysis results show that the adsorption process is a spontaneous exothermic reaction.The optimal pH value for the adsorption of SMZ by N-rGO is about 7,and the simulation study shows that the anions and cations in the natural water matrix will not inhibit the adsorption process,but humic acid has an adverse effect on the adsorption performance.The characterization results show that the surface of N-rGO is more wrinkled with a rich variety of oxygen-containing functional groups.These structural features provide conditions for efficient adsorption.The results show that N-rGO can quickly and effectively adsorb the trace amounts of antibiotics in the water,which provides a basis for the construction and regulation of the"adsorption-catalytic oxidation"system,which is conducive to the next step of research.

关 键 词：氮掺杂石墨烯 抗生素 吸附 微量污染物 

分 类 号：X522[环境科学与工程—环境工程]