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Efficient adsorption of Rh(III) from HNO$$_{3}$$ solution on ion-exchange resin bearing ${it N,N,N}$-trimethylglycine by adding N donor ligands and desorption using thiourea

Suzuki, Tomoya; Morita, Keisuke ; Sasaki, Yuji  

To recover Rh(III) from HNO$$_{3}$$ solution, adsorption experiments have been performed using an ion-exchange resin bearing an ${it N,N,N}$-trimethylglycine group (AMP03). AMP03 was found to exhibit relatively high adsorption ability for Rh(III) for [HNO$$_{3}$$]$$_{rm surp}$$ $$<$$ 0.02 M ([HNO$$_{3}$$]$$_{rm surp}$$ denotes HNO$$_{3}$$ concentration in the supernatant), and the ${it K$_{d}$}$ values increase significantly with the addition of triethylamine or tris(2-aminoethyl)amine to 0.12 M HNO$$_{3}$$ solutions. In contrast, the addition of thiourea leads to a decrease in the ${it K$_{d}$}$ 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$$_{3}$$ solution.



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Category:Chemistry, Multidisciplinary



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