Abstract: A new type of electrode has been prepared by composite of molybdenum disulfide (MoS2) and graphene oxide (GO), and applied in adsorbing Pb(II) in water using capacitance deionization method. The electrode was characterized by X⁃Ray Diffraction (XRD), Raman, Transmission Electron Microscopy(TEM), and Brunauer⁃Emmett⁃Teller(BET). The adsorption mechanism was investigated using X⁃ray photoelectron spectroscopy (XPS), XRD and cyclic voltammetry (CV). The results indicate that GO in the GO/MoS₂ composite could prevent aggregation of MoS2 and increase the interface of electrode with electrolyte. Besides, the absorption mechanism is proved to be the synergistic absorption effects of double electrode layer and pseudo⁃capacitance, and the former is more effective. The adsorption capacity of GO/MoS₂ composite electrode is 4 614.9 mg/g, higher than that of pure GO 1 876.9 mg/g and pure MoS2 1 175.4 mg/g, Therefore, GO/MoS₂ electrode shows superior performance in removal of Pb(II) with high concentration.

Key words: Capacitive deionization, Graphene, Pb(II) removal

摘要： 以二硫化钼(MoS2)与氧化石墨烯(GO)复合制备了一种新型电极，通过电容去离子法将此电极应用于吸附水体中的铅离子。对电极进行了X射线衍射（XRD）、拉曼光谱（Raman）、透射电镜（TEM）和比表面积（BET）表征；对吸附实验后的电极进行了X射线光电子能谱（XPS）、X射线衍射和循环伏安法（CV）表征，并探讨其吸附机理。结果表明，石墨烯的加入可以防止MoS2堆积，增加与溶液接触的界面面积；吸附机理为双电层吸附与赝电容吸附协同吸附，且以双电层吸附为主，吸附容量为4 614.9 mg/g，而单体GO和MoS2电极吸附容量分别为1 876.9 mg/g和1 175.4 mg/g。因此，GO/MoS2复合电极在去除高浓度铅离子方面有明显优势。

关键词: 电容去离子, 石墨烯, 铅离子去除