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研究报告

Synthesis of graphene oxide/magnetite chitosan composite and adsorption performance for sulfadiazine

基金项目：国家水体污染控制与治理科技重大专项（No.2013ZX07201007）；新世纪优秀人才支持计划（No.NCET-11-0795）；哈尔滨工业大学城市水资源与水环境国家重点实验室自主课题（No.2012DX04）

摘要：采用一步溶剂热法制备磁性氧化石墨烯/壳聚糖三元复合材料（GO/CS/Fe₃O₄）.复合材料的表征结果显示，GO/CS/Fe₃O₄含有丰富含氧官能团，氧化石墨烯片层上均匀负载四氧化三铁磁性粒子，分散到水中的磁性复合材料在外加磁场的作用下，具有良好的磁分离效果.选择磺胺嘧啶为目标污染物考察复合材料吸附性能.结果表明，吸附动力学符合拟二级动力学模型，吸附等温线符合Langmuir模型，在295、303、313 K温度下最大吸附量分别为53.30、60.56、79.23 mg·g^-1，吸附热力学参数表明GO/CS/Fe₃O₄对磺胺嘧啶的吸附是以物理吸附为主的自发吸热反应.通过不同pH条件下吸附量和Zeta电位分析吸附机理，证明π-π电子共轭效应及静电吸附是复合材料吸附磺胺嘧啶过程中的主导作用力.

Abstract：In this research, a ternary nanocomposite, graphene oxide/magnetite chitosan (GO/CS/Fe₃O₄), was synthesized through a one-pot solvothermal method. The characterization results show that there were plenty of oxygen-containing functional groups located on the surface of the nanocomposite. the magnetic spheres were decorated and anchored uniformly in interlayers of GO, and the composite was easily separated and collected by an external magnetic field in water phase. Sulfadiazine was chosen as target pollutant to evaluate the adsorption property of GO/CS/Fe₃O₄.The results show that the adsorption kinetics was well described by the pseudo-second order kinetics model. Langmuir model better fits for the result of the adsorption equilibrium., The ideal maximum adsorption capacity was calculated as 53.30、60.56、79.23 mg·g^-1 under 295, 303 and 313 K, respectively. Thermodynamic parameters indicate that the adsorption of sulfadiazine by GO/CS/Fe₃O₄ was spontaneous endothermic physical process. Adsorption capacity and the surface charge of the nanocomposite under the different pH were studied to investigate the adsorption mechanism, revealed that the π-π conjugate interaction and electrostatic attraction were dominated interaction forces in the adsorption process mentioned.