In the present study, in order to examine the N,N-dimethylaminopropylacrylamide/acrylamide {DMAPAA/AAm} hydrogels' capabilities of repetitive heavy-metal-anion recovery from waste fluid, the authors performed successive Cr(VI) adsorption and the adsorbed-Cr(VI) desorption experiments. It has been proved that the DMAPAA/AAm gels show both of the high Cr(VI)-capturing functionality and Cr(VI)-desorption efficiencies. The results in the present study have demonstrated a possibility of a heavy-metal-anion recycling system in which the hydrogels are reused a number of times.

The authors have investigated heavy-metal-anion (hexavalent chromium, Cr(VI)) adsorption and desorption properties of N,N-dimethylaminoethylacrylamide/acrylamide (DMAEAAm/ AAm) gels successively. Though the DMAEAAm/AAm gels show relatively low Cr(VI)-capturing efficiencies, the hydrogels have a possibility of actual use as a heavy-metal-anion recovering material because the DMAEAAm/AAm gels with some compositions show high desorption efficiency of the captured-Cr(VI), which is advantageous to a heavy-metal-anion recycling system with repetitive use of the hydrogel.

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