芳基重氮盐改性石墨烯制备及其吸附性能研究

通过还原-改性-再还原的方法制备芳基重氮盐改性石墨烯(S-RGO),采用红外光谱仪、X射线衍射仪对S-RGO结构进行表征,研究吸附时间、溶液pH值、初始质量浓度和吸附剂用量等因素对S-RGO吸附亚甲基蓝的影响,探究其吸附动力学及等温吸附行为。结果表明,S-RGO对亚甲基蓝的吸附率可达88.7%;S-RGO对亚甲基蓝的吸附符合准二级动力学吸附模型和Freundlich等温吸附模型;S-RGO和MB之间的吸附既有吸附质和吸附剂分子间π-π键相互作用,又有静电作用,是二者协同作用的结果。

Preparation and Adsorbtion Property of Graphene Modified by Aryl Diazonium Salts

Aryl diazonium salts modified graphene(S-RGO)were prepared by reduction-modification-re-reduction method.The structure of S-RGO were characterized by Fourier transform infrared spectroscopy and X-ray diffraction.The effects of adsorption time,pH value,initial concentration and adsorbent dosage on the adsorption of methylene blue by S-RGO were investigated,the dynamic and isothermal adsorption behavior were also studied.The results showed that:the adsorption rate of S-RGO for MB reached 88.7%;the adsorption kinetics was in accordance with the pseudo-second-order kinetic adsorption model;and the isotherm data were well described by the Freundlich isothermal model;The adsorption between S-RGO and MB had bothπ-πbond interaction and electrostatic interaction between adsorbate and adsorbent molecules,which was the result of synergistic effect.