二硫代氨基甲酸键合硅胶对Cu^(2+)吸附性能研究

Adsorption of Cu^(2+) on Dithiocarbamate Groups Modified Silica Materials

本文以柱层层析硅胶为原料,用γ-氨丙基三甲氧基硅烷对其表面进行修饰,制得氨基键合硅胶微粒,进而在碱性条件下与二硫化碳反应,合成二硫代氨基甲酸键合硅胶(DTC-SiO2)。以Cu2+为吸附对象,考察DTC-SiO2对金属离子的吸附性能,探讨了溶液pH值、吸附剂用量、初始Cu2+浓度、吸附时间等影响材料吸附效果的因素,并研究了吸附剂对Cu2+的吸附等温线和动力学吸附特性。结果表明,在温度298K下,DTC-SiO2对Cu2+的吸附符合Langmuir等温式,准二级吸附动力学方程能够很好地描述Cu2+在DTC-SiO2上的吸附动力学行为。

3-Aminopropyltrimethoxysilane（APTMS） was amino modified silica, and then the dithiocarbamate groups used to modify the surface of the silica to obtain a functionalized silica was prepared after reacting with carbon disulfide in the alkaline condition. To investigate the factors that affect the adsorption performance of the material, pH of the solution,the amount of the sorbents,the initial concentration of copper ion and adsorption time were studied. C characteristics of Cu2＋ on the DTC equilibrium data of Cu2＋ was in ac order kinetic model. hoosing Cu2＋ as a target, -giO2 were investigated as we cordance with the Langmuir the isotherm and dynamic adsorption 11. The results show that the adsorption isotherm model and the pseudo-second-