二乙烯三胺改性磁性氧化石墨烯复合材料的镉离子吸附性能  

Adsorbility of diethylenetriamine-modified magnetic graphene oxide composite to cadmium(Ⅱ) ions

作　　者：钟明峰[1] 吴文刚 张志杰[1] 陈岩贽 王炜 ZHONG Ming-feng;WU Wen-gang;ZHANG Zhi-jie;CHEN Yan-zhi;WANG Wei(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510641 [2]生态环境部华南环境科学研究所,广东广州510655

出　　处：《电镀与涂饰》2019年第23期1299-1304,共6页Electroplating & Finishing

基　　金：2013年中央重金属污染防治专项资金《清远电子废弃物拆解重金属污染治理项目清远电子废弃物拆解重金属污染治理项目(首期工程)》

摘　　要：以二乙烯三胺(DETA)、氧化石墨烯(GO)及共沉淀法制备的四氧化三铁(Fe3O4)为原料,通过原位聚合法制得二乙烯三胺改性磁性氧化石墨烯复合材料(DETA-mGO)。通过透射电镜(TEM)、傅里叶变换红外光谱仪(FT-IR)、X射线光电子能谱仪(XPS)等对DETA-mGO进行了表征,并研究了它吸附水中Cd(Ⅱ)离子的行为。结果表明:DETA-mGO的饱和磁化强度为28.5 emu/g;DETA改性大幅提高了DETA-mGO对Cd(Ⅱ)的吸附量,其吸附量高达114.5 mg/g。DETA-mGO吸附动力学基本符合准二阶模型,吸附速率主要由化学吸附阶段控制。其吸附等温线与Langmuir吸附等温线更吻合,吸附过程主要是单分子层的化学吸附。A DETA-mGO(diethylenetriamine-modified magnetic graphene oxide) composite was prepared by in-situ synthesis from graphene oxide(GO) and coprecipitated ferroferric oxide(Fe3 O4) with diethylenetriamine(DETA) as a modifier.The composite was characterized by transmission electron microscope(TEM),Fourier-transfer infrared spectrometer(FT-IR),and X-ray photoelectron spectrometer(XPS).The adsorption behavior of Cd(II) ions on the composite was studied.The results showed that the saturation magnetization of DETA-mGO was 28.5 emu/g,and the introduction of DETA greatly improved the adsorption capability of DETA-mGO to Cd(II) ions,which was as high as 114.5 mg/g.The adsorption kinetics of DETA-mGO is in accordance with the pseudo-second order model,and the adsorption rate is mainly controlled by the chemical adsorption stage.The adsorption isotherm is consistent with Langmuir adsorption isotherm,and the adsorption process is mainly the chemical adsorption of single molecular layer.

关 键 词：氧化石墨烯 二乙烯三胺 四氧化三铁 磁性改性 复合材料 镉离子 吸附 动力学 

分 类 号：O647.3[理学—物理化学] X781.1[理学—化学]