氧化石墨烯辐射接枝4-乙烯基吡啶及其对Cr(Ⅵ)吸附性能研究  

Radiation-induced grafting of 4-vinyl pyridine on graphene and its Cr(Ⅵ)adsorption

作　　者：张有为 马慧玲 刘平桂 赫丽华 罗文 Zhang Youwei;Ma Huiling;Liu Pinggui;He Lihua;Luo Wen(Beijing Institute of Aeronautical Materials,Beijing 100095;School of Materials Science and Engineering,Beijing Institute of Clothing,Beijing 100029)

机构地区：[1]北京航空材料研究院,北京100095 [2]北京服装学院材料科学与工程学院,北京100029

出　　处：《化工新型材料》2018年第12期125-128,132,共5页New Chemical Materials

基　　金：国家自然科学基金青年基金(11505011和11405168)

摘　　要：通过辐照接枝法在氧化石墨烯(GO)的表面接枝4-乙烯基吡啶(4-VP)制备了一种新型Cr(Ⅵ)吸附剂,并研究了单体浓度和吸收剂量对4-VP接枝率的影响。结果表明:聚4-乙烯基吡啶成功接枝到GO表面。接枝产物对Cr(Ⅵ)具有较好的吸附性能,在40min即可达到吸附平衡,吸附机理为离子交换机理,吸附过程符合朗格缪尔吸附等温模型,理论最大吸附量为114.9mg/g。在pH=3.12时,吸附剂对Cr(Ⅵ)吸附量可以达到最大值99.8mg/g。A novel adsorbent for Cr(Ⅵ) was prepared by radiation-induced grafting of 4-vinyl pyridine onto the surface of graphene oxid.The grafting yield was adjusted by the total absorbed dose and the concentration of 4-vinyl pyridine.Fourier transform infrared spectroscopy confirmed that poly(4-vinyl pyridine) grafted onto the surface of graphene oxide.It was found that adsorption equilibrium could be achieved within 40min.The adsorption kinetics was followed by ion exchange mechanism,and Equilibrium data were explained with the help of Langmuir equation.The maximum theoretical Cr(Ⅵ) uptake of adsorbent was 114.9mg/g.The adsorption capacity reached a maximum Cr(Ⅵ) uptake (99.8mg/g) as pH was 3.12.

关 键 词：氧化石墨烯 4-乙烯基吡啶 辐射接枝 Cr(Ⅵ)吸附 

分 类 号：O647.3[理学—物理化学]