磁性三乙烯四胺氧化石墨烯对Cu^(2+)的吸附行为  

Adsorption behavior of magnetic triethylene tetramine-graphene oxide nanocomposite for Cu^(2+)

作　　者：陈芳妮[1] 孙晓君[1] 魏金枝[1] 刘献斌[1] 胡琴[1] 

机构地区：[1]哈尔滨理工大学化学与环境工程学院,黑龙江哈尔滨150040

出　　处：《化工学报》2016年第5期1949-1956,共8页CIESC Journal

基　　金：国家自然科学基金项目(51208159);黑龙江省自然科学基金项目(B201204)~~

摘　　要：为了提高氧化石墨烯(GO)的吸附能力和分离效果,采用恒温搅拌法和水热法制备磁性三乙烯四胺氧化石墨烯(M-T-GO)复合吸附剂。通过X射线衍射(XRD)、傅里叶红外光谱(FT-IR)和透射电镜(TEM)测试方法对其进行表征,并对M-T-GO对Cu^(2+)的p H、吸附动力学、吸附等温线和吸附热力学进行研究。结果表明,M-T-GO对Cu^(2+)的吸附符合二级反应动力学和Langmuir吸附等温式描述,吸附反应为自发吸热过程,饱和吸附量为245.09 mg·g-1,同时具有快速分离和易再生的优点。采用X射线光电子能谱(XPS)推测M-T-GO对Cu^(2+)的吸附机理,结果表明M-T-GO主要通过螯合作用和静电引力对Cu^(2+)进行吸附。A novel composite adsorbent of magnetic triethylene tetramine graphene oxide（M-T-GO） was firstly prepared by isothermal stirring and hydrothermal method to improve adsorption ability and separation efficiency of graphene oxide（GO）. M-T-GO was characterized by Fourier transform infrared spectrometer（FT-IR）, X-ray diffraction（XRD） and transmission electron microscope（TEM）, respectively. The p H, adsorption kinetics, isotherms and thermodynamics of Cu^2＋ on M-T-GO were studied, indicating that the adsorptions kinetic was well fitted by pseudo-second-order model and the equilibrium adsorption was well described with Langmuir model. The saturated adsorption capacity of Cu^2＋ was about 245.09 mg·g^-1 on M-T-GO. M-T-GO could make separation of the adsorbents easy in the foreign magnetic field and possess good performance of regeneration. The adsorption process of Cu^2＋ was spontaneous and endothermic by the calculated thermodynamic parameters. X-ray photoelectron spectroscopy（XPS） spectra suggested that Cu^2＋ was adsorbed on M-T-GO mainly through the chelation and electrostatic attraction.

关 键 词：氧化石墨烯 吸附 CU^2+ 动力学 等温线 

分 类 号：X592[环境科学与工程—环境工程]