Removal of ionic substances from dilute solution using activated carbon electrodes

摘要

Removal of various electrolytes from aqueous solution and a recycling operation were carried out using a flow-through capacitor. The amount of ions removed corresonds tothe surface area and especially the micropore volume of the activated carbon electrode. Introduction of acidic functional groups on the surface of the carbon promoted ion removal (i.e.increase inrate and capacity),but there is a limit to the amount of functional gorups that can be introduced with good effect. The adsorption-desorption properties of various alkali,alkaline earth and heavy metal sulfates were investigated. It was found that removalcharacteristics were different for the diffeent types of ions. Depletion of the electrode also differed depending on the electrolyte that was removed. When copper and zinc ions were removed,the surface area of the cathode was reduced by a small amount.