为提高电容去离子技术（CDI）对水中镉离子（Cd²⁺）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 m²/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 mL/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 Cd²⁺ 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 m²·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.

余杨(1995-),男,硕士研究生,研究方向为水污染治理,yuyang950504@163.com