Efficient adsorption of Rh(III) from HNO solution on ion-exchange resin bearing -trimethylglycine by adding N donor ligands and desorption using thiourea

Suzuki, Tomoya; Morita, Keisuke ; Sasaki, Yuji  

To recover Rh(III) from HNO solution, adsorption experiments have been performed using an ion-exchange resin bearing an -trimethylglycine group (AMP03). AMP03 was found to exhibit relatively high adsorption ability for Rh(III) for [HNO] 0.02 M ([HNO] denotes HNO concentration in the supernatant), and the values increase significantly with the addition of triethylamine or tris(2-aminoethyl)amine to 0.12 M HNO solutions. In contrast, the addition of thiourea leads to a decrease in the values; i.e., a masking effect on Rh(III) was observed. These results show that AMP03 has a significant potential for effectively recovering Rh from HNO solution.