Sorption of rhenium on alumina under dynamic conditions

• Main Authors: Lukić Dragoljub M., Vučina Jurij L., Milonjić Slobodan K.
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2007-01-01
• Series: Journal of the Serbian Chemical Society
• Subjects: rhenium; sorption; alumina; sorption capacity; sorption isotherm
• Online Access: http://www.doiserbia.nb.rs/img/doi/0352-5139/2007/0352-51390706555L.pdf

The sorption of perrhenate anion on alumina from aqueous solutions of sodium chloride was investigated under dynamic conditions. The initial concentrations of rhenium were in the range of 2.7x10-2-2.7 mmol/dm3. The breakthrough curves as the function of Re and NaCl concentrations (0.12-0.20 mol/dm3), pH 2-6 and flow rate 3-10 ml/min were determined. According to the experimental results, it was concluded that the breakthrough capacities, the capacities at c/c0 = 0.5, the total column capacities and the utilization degrees (column efficiency) increase with increasing Re and NaCl concentrations and decreasing pH. The optimal flow rate was found to be 3 ml/min. At pH2 and c0 = 2.7 mmol Re/dm3, the total capacity was found to be Q 0.9 max = 2.1x10-2 mmol Re/g Al2O3. The data for perrhenate anions fit with a Henry-type isotherm. It was found that, under the above mentioned conditions, the value of the Henry constant K H was 7.8x10-3 dm3/g and the Gibbs energy change, ΔG was -0.5 kJ/mol.