Abstract

Ashok Narhari Patange

DOI : http://dx.doi.org/10.13005/ojc/330255

The ion exchange resins are important material for study of various uni-univalent and uni-bivalent ion exchange reactions for the separation, purification and the treatment of industrial effluent’s and nuclear waste. In the current investigation attempts were done to evaluate the performance and the selectivity behavior of peroxide degraded resins viz AuchliteARA-9366 towards the Br^- and I^- ions from the external solution. AuchliteARA-9366 resins in chloride form were subjected to Hydrogen peroxide degradation separately on the magnetic stirrer for 24h at room temperature using 20% (6 volume) and 30% (9 volume) H₂O₂. The ion exchange equilibrium study of the peroxide degraded AuchliteARA-9366 resin in chloride form were done separately with KBr and KI solution of concentrations range from 0.01M to 0.1M at the temperature 30.0°, 35.0°, 40.0° and 45.0°C for 3h and the equilibrium constants (K) values for Cl^-/I^- and Cl^-/Br^- ion exchange reactions were determined. It was found that during Cl^-/I^- ion exchange reactions, the K values of AuchliteARA-9366 resin degraded using 20% H₂O₂ were found to be decreases from 37.28 x 10^-2 to 15.61 x 10^-2 which was higher than the K values observed for the resin degraded using 30% H₂O₂ which decreases from 20.53 x 10^-2 to 15.54 x 10^-2with rise in temperature from 30.0 - 45.0°C. Similar results were observed during Cl^-/Br^- ion exchange reactions for the resins AuchliteARA-9366.The equilibrium constant (K) values were found to be decreases with rise in temperature shows that both Cl^-/I^- and Cl^-/Br^- ion exchange reactions were exothermic in nature and which was further supported by negative enthalpy (∆H°) and entropy (∆S°) values. The equilibrium constant (K) values of peroxide degraded resins indicates that resins effectively oxidized with increase in the concentration of H₂O₂ from 20% to 30% which were also seen in SEM micrographs and FTIR spectrum of the resin. The results obtained from the present study will be helpful in understanding the effects of hydrogen peroxide degradation on the performance and halide ion selectivity behavior of ion exchange resins AuchlitARA-9366.

Hydrogen peroxide degradation; AuchliteARA-9366; anion exchanger; nuclear and industrial grade resin; enthalpy

[ View HTML Full Text]