Capturing of Positive and Negative Rare-metal Ions by Polarity-Composite Hydrogels

Abstract

In the present study, the authors have newly developed polarity-composite hydrogels and have investigated their adsorption properties of the positive and negative rare-metal ions in order to search for the functional materials serviceable to effective and simple heavy-metal and rare-metal recycling systems. In the present study, it has been revealed that the newly developed polarity-composite hydrogels show high adsorption efficiencies of both of the positive and negative rare-metal ions which are comparable to the single-polarity hydrogels having been investigated by the authors. The features observed in the present study have demonstrated the newly developed hydrogels' potential to be utilized in the recycling system from industrial wastes often called as "urban mine."

Nano-structural Analyses of Copper-ion-adsorbed PAAm/SA Gels after UV-light Irradiation

“…The first practical application of the multivalent-ion capturing property of the ionized hydrogel was made for developing the heavy-metal ion detector [6], however, the functionality of the detector utilizing the gel's multivalent-ion capturing property was only to indicate the ion species in the solvent by means of the difference in the volume phase transition temperature; there had not been the applications paying the attention to the multivalent-ion capturing amount. Under these circumstances, the authors have been investigating both of the adsorption and desorption properties of some hydrogels for the heavy-and/or rare-metal cations and anions aiming at the utilization for the environmental purification and the resource recycling [7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”