DTC-GO as Effective Adsorbent for the Removal of Cu2+ and Cd2+ from Aqueous Solution

摘要

dithiocarbamate-graphene oxide (GO) was prepared by simple method through reactions between poly3-aminopropyltriethoxysilane functionalized GO (PAS-GO) and CS2. DTC-GO can capture Cu2+ and Cd2+ effectively to generate stable structures and then remove them from aqueous solutions. The properties of the DTC-GO are characterized by Fourier transform infrared spectroscopy (FTIR). The adsorption capacity for heavy metal ions of DTC-GO was evaluated by the removal of Cu2+ and Cd2+ from aqueous solution. The effect of several factors, including the pH, contact time, and temperature, was investigated by batch experiment. The results show that the DTC-GO exhibits excellent adsorption capacity for Cu2+ and Cd2+. The adsorption kinetics study indicates that the adsorption kinetics of Cu2+ and Cd2+ all could be well described by pseudo second-order kinetic model. The adsorption isotherm was investigated by Langmuir. Freundlich, and Dubinin-Radushkevich isotherm models, and the adsorption process was well described by the Langmuir model. The effect of temperature shows that the process of DTC-GO for Cu2+ and Cd2+ is an endothermic process. The results indicated that the DTC-GO can be used as one of the promising candidate adsorbents with enhanced removal capacity for the adsorption of Cu2+ and Cd2+.