| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 151052 | Chemical Engineering Journal | 2011 | 10 Pages |
In this study, a chelating resin, Diaion CR 11, was studied in order to selectively remove Cu2+ and Cr3+ present in synthetic effluents. Single-component equilibrium isotherm was determined in batch experiments for copper, and an exchange equilibrium based model was used to correlate the experimental data of the binary system Cu2+/H+. It was observed that the maximum capacity of the resin increased 2.3 times when the pH varied from 2 to 5 at 25 °C. The equilibrium constant increased 1.4 times when the temperature changed from 25 to 50 °C at initial pH of 3. For the operating conditions tested, it was found that the resin exhibited a better selectivity for Cu2+ over Cr3+. A mathematical dynamic model was successfully implemented for describing the saturation behavior of the multicomponent system Cu2+/Crt/H+ in the column operation. The regeneration of the resin was also experimentally studied by using HCl followed by a mixture of NaOH/H2O2. High efficiencies were observed for copper during the first step, where it was almost fully eluted from the resin with 1 M HCl. The use of those regenerant agents in the presence of iron seems to effectively strip chromium from the resin.
► A chelating resin, Diaion CR 11, was used to remove copper and trivalent chromium. ► The resin exhibited a better selectivity for copper over chromium. ► Multicomponent breakthrough curves were well described by a dynamic model. ► Regeneration of the resin was achieved by using HCl and NaOH/H2O2.
