Abstract
The effect of temperature on acid and metals binding was studied using a commercial chelating adsorbent CuWRAM® (by Purity Systems Inc., USA) which contains 2-(aminomethyl)pyridine (AMP) ligands on a polyamine–silica composite. The binding equilibria in synthetic copper and nickel sulfate solutions and authentic multimetal process solutions were measured at 25–90 °C in batch experiments using potentiometric and spectroscopic methods. Experimental data were correlated with a non-ideal competitive adsorption (NICA) model. According to the results, the binding enthalpy is negative for both sulfuric acid and metal sulfates. Basicity and metals binding strength of the adsorbent thus decrease with temperature. The affinity for copper remains sufficiently high even at 90 °C to ensure high uptake selectivity from a concentrated ZnSO 4 solution. At the same time the amount of metal adsorbed remains constant or even increases with increasing temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
