Abstract
A novel asymmetric CDI device was home-made for the removal of cations from aqueous solution through the structural innovation in this experiment. The adsorbent materials were characterized by SEM and BET as well as performing CV curve tests. The results showed that the materials exhibited excellent performance（the Specific surface area is 321.14 m²/g） and the maximum specific capacitance of the adsorbent material can reach 60F/g at the 5mV/s. The optimal operating conditions of the asymmetric CDI device were obtained using an orthogonal test method analysis and response surface methodology (RSM): the best desalination efficiency of CDI was obtained at concentration is 455.82 mg/L, potential is 1.18 V and flow rate is 46.54 mL/min. After the analysis of first-order kinetic model，it can be obtained that the fastest adsorption efficiency for Ca2+, followed by Mg2+, and the slowest for Na+, and the CDI device had better adsorption effect on divalent cations. Simulation by Comsol software showed that the adsorption efficiency was better at high flow rate. In addition, the CDI device has good stability, and the mechanism of targeted cation removal and mass transfer process of the CDI were discussed in detail.
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