DTC-GO as Effective Adsorbent for the Removal of Cu2+ and Cd2+ from Aqueous Solution
2016
Guo, Li-Juan | Niu, Cheng-Gang | Wang, Xiao-Yu | Wen, Xiao-Ju | Zeng, Guang-Ming
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⁺.
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