石墨带电极在电容法脱盐中的吸附特性研究

EXPLORATION OF ADSORBING CHARACTERISTICS OF THE GRAPHITE CLOTH ELECTRODES IN CAPACITIVE DEIONIZATION

采用具有高比表面积的石墨带作为电容法脱盐吸附电极。试验考察了在不同电压和不同浓度下石墨带电极对NaCl溶液的吸附规律。结果表明,石墨带电极的比吸附量随着极板电压和原料液浓度的增大而增加,但极板电压对电极比吸附量的影响更显著。通过对石墨带电极等温吸附曲线的测定,发现电极表面吸附的离子符合朗格缪尔吸附规律。通过对电极的表面改性可以在一定程度上提高电极表面的有效利用率,从而提高比吸附量。

Graphite cloths with high specific surface area were used as the material of capacitive deionization （CDI） electrodes. The effects of the working voltage applied on the graphite cloth electrodes and feed concentrations on adsorption characteristics were studied. The results show that the adsorption capacity of graphite cloth electrodes increased with the increasing of the working voltage and the feed concentration, comparatively effect of the working voltage on the adsorption capacity was much stronger than that of the feed concentration. Also, it was found that the ions adsorption on the graphite cloth electrodes at different NaCI concentrations was consistent with the Langmuir isothermal adsorption, and the utilization of the electrode surface could be enhanced through surface modification in a certain extent, so as to improve the specific adsorption capacity of the electrodes.