碳纳米管/氧化石墨烯复合电极制备及除镉研究  

Preparation of CNTS/GO composite electrode and study on its application in removing cadmium

作　　者：余杨 王黎[1] 鲁逸飞 胡雨莎 廖梦根 YU Yang;WANG Li;LU Yi-fei;HU Yu-sha;LIAO Meng-gen(School of Resources and Environment Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《现代化工》2021年第6期134-139,共6页Modern Chemical Industry

基　　金：湖北省国家自然科学基金(16CFA086)。

摘　　要：为提高电容去离子技术(CDI)对水中镉离子(Cd^(2+))的去除效率,以氧化石墨烯(GO)为主吸附材料、改性碳纳米管(CNT^(*))为次吸附材料兼导电剂制备了复合电极,通过测试比表面积、循环伏安特性曲线可知,当m(氧化石墨烯)∶m(碳纳米管)∶m(聚偏氟乙烯)=7.2∶0.8∶2时,电极的比表面积为391.72 m^(2)/g,比吸附量达到11.25 mg/g,比电容达到142.36 F/g。工作电压为1.2 V、循环流速为20 m L/min、电极板间距为3 mm、电极对数达到4对时,镉的去除率可以达到91.8%。通过动力学分析,准一级动力学模型能较好地描述电极对离子的吸附速率。通过对吸附等温线拟合分析,Langmuir模型的拟合率为98.9%,Freundlich模型的拟合率为99.87%,证明GO/CNT^(*)电极在CDI去除镉离子中具有较好的效果。To improve the removal efficiency of Cd^(2+)in water through capacitive deionizing technology,a composite electrode is prepared by using modified graphene oxide(GO)as main adsorption material,and modified carbon nanotubes(CNT^(*))as secondary adsorption material and conductive agent.By detecting specific surface area and cyclic voltammetry characteristic curve,it is found as the mass ratio of m(GO)∶m(CNT^(*))∶m(polyvinylidene fluoride)=7.2∶0.8∶2,the composite electrode has a specific surface area of 391.72 m^(2)·g-1,a specific adsorption capacity of 11.25 mg·g-1 and a specific capacitance of 142.36 f·g-1.Cadmium ion removal rate can reach 91.8%when the working voltage is 1.2 V,the circulating flow rate is 20 ml·min-1,the electrode plate spacing is 3 mm,and the electrode logarithm reaches 4 pairs.Through kinetic analysis,quasi-first-order kinetic model can describe well the adsorption rate of the electrode to ions.By means of adsorption isotherm fitting analysis,it has a fitting rate of 98.9%to Langmuir model,and a fitting rate of 99.87%to Freundlich model.It proves that GO/CNT^(*)composite electrode has a good adsorption effect in removing cadmium ion by capacitive deionizing technology.

关 键 词：氧化石墨烯 碳纳米管 电容去离子 复合材料 镉离子 

分 类 号：O83002[理学]