磁性双壁碳纳米管(m-DWCNTs)对水中全氟辛烷磺酸(PFOS)的吸附  

Adsorption of perfluorooctane sulfonate(PFOS)in water by magnetic double-walled carbon nanotubes(m-DWCNTs)

作　　者：吴思雅 江敏 吴昊[3] 吴迪 许杰尧 WU Siya;JIANG Min;WU Hao;WU Di;XU Jieyao(College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai,201306,China;Water Environment&Ecology Engineering Research Center of Shanghai Institution of Higher Education,Shanghai,201306,China;College of Fisheries and Life,Shanghai Ocean University,Shanghai,201306,China)

机构地区：[1]上海海洋大学海洋生态与环境学院,上海201306 [2]水域环境生态上海高校工程研究中心,上海201306 [3]上海海洋大学水产与生命学院,上海201306

出　　处：《环境化学》2023年第1期277-287,共11页Environmental Chemistry

基　　金：上海市科技兴农重点攻关项目(2021-02-08-00-12-F00748);上海市科技兴农项目(沪农科创字(2019)第3-5号)资助。

摘　　要：本文以双壁碳纳米管(double-walled carbon nanotubes,DWCNTs)为基础材料,通过化学沉淀法制备了磁性双壁碳纳米管(magnetic double-walled carbon nanotubes,m-DWCNTs),研究了pH和吸附剂投加量对全氟辛烷磺酸(perfluorooctane sulfonate,PFOS)的吸附影响.采用扫描电镜(SEM)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)和VSM对吸附前后的m-DWCNTs进行了观察,并进行了吸附动力学模型和等温线模型拟合.结果表明,磁化后的双壁碳纳米管包覆了铁的氧化物,出现了Fe3O4的特征衍射峰,具有超顺磁性,饱和磁化强度为66.07 emu·g^(-1).m-DWCNTs对PFOS的吸附更符合准二级动力学方程(R 2>0.95)和Langmuir等温吸附模型(R 2>0.95).随着m-DWCNTs投加量的增加,吸附量逐渐降低,去除率逐渐升高.吸附量随着pH值的增加而逐渐降低,其主要原因有可能是mDWCNTs对PFOS的吸附产生了静电作用.本研究结果为后续纳米材料处理水中的PFOS提供了借鉴和参考.Magnetic double-walled carbon nanotubes(m-DWCNTs)are prepared by chemical precipitation method.The adsorption effects of perfluorooctane sulfonate(PFOS)under different pH and adsorbent dosages were studied,and m-DWCNTs were characterized by SEM,FTIR,XRD and VSM.The adsorption kinetic model and isotherm model were used for fitting.The results showed that the magnetized double-walled carbon nanotubes were coated with iron oxides,and had the characteristic diffraction peaks of Fe3O4.They were superparamagnetic and had a saturation magnetization of 66.07 emu·g^(-1).The adsorption of PFOS by m-DWCNTs was more in line with the pseudo-second-order kinetic equation(R 2>0.95)and the Langmuir isotherm adsorption model(R 2>0.95).With the increase of the dosage of m-DWCNTs,the adsorption capacity of PFOS gradually decreased,and the adsorption rate gradually increased.The adsorption capacity gradually decreases with the increase of pH value.The main reason may be the electrostatic effect of mDWCNTs on the adsorption of PFOS.The results of this study provide a reference for the subsequent treatment of PFOS in water bodies with nanomaterial.

关 键 词：全氟辛烷磺酸 双壁碳纳米管 磁性 吸附. 

分 类 号：X703[环境科学与工程—环境工程]