A comparative study on the adsorption of 8-amino-1-naphthol-3,6-disulfonic acid by a macroporous amination resin

In this study, a novel macroporous amination resin (named as GMDA) with the matrix of divinylbenzene and glycidyl methacrylate was synthesized and utilized to remove 8-amino-1-naphthol-3,6-disulfonic acid (H-acid) from water. The adsorption behaviors of the synthetic resin were studied systematically and compared with three commercial resins (the hypercrosslinked resin NDA-88, the anion-exchange resin D-301, and the macroporous resin XAD-4) in terms of adsorption capacity, equilibrium time, isotherm adsorption , the effect of existing inorganic ions and regeneration properties. The characteristic methods of BET surface area, pore size distribution, SEM , FTIR , XPS and Zeta potential were investigated to analyze the resins and adsorption process . The GMDA resin has wider pore diameter than the NDA-88 resin to attract H-acid more quickly with higher adsorption amounts; the larger BET surface area of the GMDA resin ensures more binding sites than the D-301 resin in the adsorption process; the functional groups on the surface of the GMDA resin is more effective than the hydrophobic matrix of the resin XAD-4 in the removal of H-acid. Especially, the regeneration and dynamic experiments indicate the anti-fouling performance of GMDA resin is much better than the others. This research not only provides guidance for understanding the adsorption mechanism of H-acid onto the four resins, but also gives theoretical basis for the design of resin structure according to the targeted contaminants.