利用活性碳毡构建流通式电容去离子器件及其电容脱盐性能研究

Activated carbon felt (ACF) was selected as electro-adsorption material to fabricate a flow-through mode capacitive deionization (CDI) device for brine wastewater desalination. Electro-adsorption capacity (EAC) of ACF was investigated under different applied voltages, influx, salinity intensities and different type of salt ions. The EAC of ACF in flow-through CDI was also compared with that in a flow-by mode CDI device. The results indicate that EAC of ACF increases with the increasing applied voltage and salinity intensity, until reaching to the maximum EAC. However, it increases first and then decreases with the increasing influx. A maximum EAC of 7.73 mg•g ^-1 has been obtained in a flow-through CDI, with the condition of 1.2 V applied voltage, 0.053 mL•min ^-1 •cm ^-2 influx and 1000 mg•L ^-1 influent salinity, while only 5.42 mg•g ^-1 of maximum EAC can be obtained in a flow-by CDI. The EACs of ACF to different type of salt ions are in the order of K ⁺ >Na ⁺ >Ca ²⁺ for cation and Cl ^- >NO ₃ ^- >SO ₄ ^2- for anion. ACF-based flow-through CDI exhibits good stability and does not appear obvious decay in 12 cycles of adsorption-desorption.