Research on the performance of plate and roll capacitor deionization devices based on supercapacitor carbon electrodes
Capacitive deionization is an energy-saving and environmentally friendly brackish water desalination technology.The performance of capacitive deionization is influenced by two significant factors:electrode materials and device configurations.Three types of commercially available supercapacitor carbons AC1,AC2,and AC3 were used to characterize and optimize them for electrode production.The results demonstrate that AC2 activated carbon exhibits the highest specific surface area(1 908.4 m2·g-1)and specific capacitance(67.8 F·g-1).And AC2's internal pore resistance is also the lowest.Therefore,AC2 was chosen as the electrode material to study the operation of plate and roll devices under different experimental conditions.The optimal working voltage of the two configurations was 1.6 V,the temperature was 25 ℃,the optimal flow rate of the plate device was 60 mL·min-1,and for the roll device it was 360 mL·min-1.Under the optimal working conditions,the desalination amount per unit area and current efficiency of the roll device are 1 569.7 mg·m-2 and 46.7％respectively,much bigger than 696.5 mig·m-2and 11.3％of the plate device.These results indicate that the roll device outperforms the plate device in terms of desalination performance and charge efficiency.
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