Abstract
The two relatively new, weak-base commercial polymeric sorbents, namely, microporous polybenzimidazole (PBI) and macroporous poly(4-vinyl pyridine) (PVP) have been compared with regard to sorption of aqueous sulfur dioxide. The sorption behaviour of PBI is also compared with that of its amine derivatives prepared by epoxidation of the resin and subsequent aminolysis with ethylene diamine and diethylene triamine. PBI shows greater saturation capacity for SO 2(aq) sorption than PVP despite having lower proton capacity than PVP in strong acids while at low concentrations of SO 2(aq), PVP exhibits greater equilibrium sorption than PBI. Interestingly, PBI, though microporous, has considerably faster kinetics for SO 2(aq) sorption than macroporous PVP, with particle phase diffusivity nearly twice that of the latter. Aminolysis of PBI does not improve the SO 2(aq) sorption capacity, as it actually decreases, on weight basis, the nitrogen content and proton capacity of the resin.
Published Version
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