Abstract
The recovery of organic dye molecules from aqueous solution was accomplished using a magnetic colloid seeding process under high-gradient magnetic separation. The recovery fraction of the dye molecule using prepared magnetic colloid was found to be much higher than that using magnetite particles. It was found that the recovery fraction of the dye molecule was dependent on the adsorption capacity of the dye molecule. We also confirmed that, among the dyes with various kinds of molecular structures and functional groups, the dye molecules having the azo group could adsorb more easily onto the colloid particles than the dye without the azo group.
