活性炭涂层电极电容去离子的性能

采用活性炭涂层电极构建电容去离子吸附装置,以氯化钠模拟含盐原水,研究电压、流量、进水浓度等操作参数对活性炭涂层电极脱盐效率和能耗的影响。实验结果表明,去除率和比吸附量随着电压的增大而增加,且比能耗随之增大。流速越小,出水的浓度越低,当对出水的浓度要求较高时,宜采用小流速。当进水浓度低于活性炭涂层电极的饱和吸附量时,比吸附量随着进水浓度呈线性增加;当达到饱和吸附量时,比吸附量不会随进水浓度的增大而发生改变;比能耗随着进水浓度的增加而降低。

Performance of capacitive deionization by using activated carbon coating-electrodes

In this study,activated carbon powder was used as coating-electrode materials to fabricate capacitive deionization (CDI) cell.The desalination performance of the CDI cell was investigated under different working voltages,applied flow rate and feed concentration of NaCl and assessed by removal efficiency and energy consumption.The experimental results indicate that the removal efficiency and specific energy consumption are directly related to the voltage.The electrosorption removal efficiency is inversely related to the applied flow rate and feed concentration.High purification could be achieved at low flow rate by giving more time for ion transfer from the bulk solution to the CDI electrodes.It is noticed that the increase in the initial feed NaCl concentration corresponds to an initially linear increase in the electrosorption load on the activated carbon electrodes.After the electrodes had reached saturation,specific electrosorption capacity remained constant.CDI specific energy consumption is inversely related to feed concentration.