金属离子嫁接三维氧化石墨烯对甲基橙吸附的影响  

Research on the adsorption of methyl orange by metal ion grafted on three-dimensional graphene oxide

作　　者：高超 张迪[1] 石林 邢小勇 陈雅群 GAO Chao;ZHANG Di;SHI Lin;XING Xiaoyong;CHEN Yaqun(Faculty of Environmental Science and Engineering Kunming University of Science and Technology,Kunming,650500,China;Binzhou Economic and Technological Development Zone Ecological Environment Comprehensive Service Center,Binzhou,256606,China)

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]滨州经济技术开发区生态环境综合服务中心,滨州256606

出　　处：《环境化学》2021年第6期1903-1910,共8页Environmental Chemistry

基　　金：国家自然科学基金(41663014);云南省中青年学术和技术带头人后备人才项目(2018HB008);云南省万人计划青年拔尖人才项目(YNWR-QNBJ-2018-336)资助。

摘　　要：本研究利用扫描电子显微镜、比表面积分析仪、傅立叶红外光谱和Zeta电位分析仪对水热合成的三维氧化石墨烯材料进行表征,探究了金属离子(Ag^(+)、Ca^(2+))嫁接对三维氧化石墨烯表面特征及甲基橙吸附特性的影响.结果表明,金属阳离子嫁接会造成三维氧化石墨烯表面孔结构破碎或坍塌,从而使材料比表面积下降.红外光谱显示金属嫁接导致三维氧化石墨烯羟基官能团减少,表现为表面负电荷的减少和氧元素含量的降低.吸附实验以及点位能量分布计算则显示,虽然金属阳离子嫁接后的材料对甲基橙的吸附量降低,但单位表面积上的吸附量则有所提高.说明金属嫁接一方面令三维石墨烯孔隙结构坍缩,比表面积下降造成吸附降低,另一方面则引入了新的吸附位点,金属尤其是多价金属产生的架桥作用对甲基橙在碳材料表面的吸附促进不可忽视.In this paper,scanning electron microscopy(SEM),specific surface area analyzer,Fourier transform infrared spectroscopy(FTIR)and zeta potential analyzer were used to analyse the effects of metal ions(Ag^(+),Ca^(2+))grafted on the surface of three-dimensional graphene oxide materials,which are synthesized by thermal hydration method.The results show that the surface pore structure of three-dimensional graphene oxide was broken or collapsed by metal cation grafting,which led to the decrease of specific surface area.The infrared spectra showed that the hydroxyl groups of three-dimensional graphene oxide decreased due to metal grafting,such can be tested by the decrease of surface negative charge and the decrease of oxygen content.The adsorption experiments and the calculation of site energy distribution showed that although the adsorption capacity of the grafted materials decreased,the adsorption capacity of per unit surface area increased.The results show that metal grafting makes the pore structure of 3D graphene collapse,and the specific surface area decreases,resulting in the decrease of adsorption on the one hand.While on the other hand,new adsorption sites are introduced.The bridging effect of metals,especially the multivalent metals,can not be ignored in promoting the adsorption of methyl orange on the surface of carbon materials.

关 键 词：水热合成 碳基纳米材料 金属离子 染料 

分 类 号：X703[环境科学与工程—环境工程]