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The absorption of equimolar sulfur dioxide (SO2) by tributyloctylphosphonium bicarbonate ([P4448]HCO3) resulted in the formation of a corresponding bisulfite ionic liquid ([P4448][bisulfite]) accompanied by carbon dioxide (CO2) release. The liquid formed absorbed an additional 0.6 equivalents of SO2. The speciation of sulfur(IV) in the SO2-loaded ionic liquid was performed using Raman and NMR spectroscopies. The two known isomeric forms of bisulfite ion in aqueous systems were identified while the condensation of bisulfite anion was suppressed in [P4448][bisulfite]. The isomer with the proton bonded to the sulfur atom (HSO3−) was more abundant than the one with the proton bonded to the oxygen atom (HOSO2−). The isomeric exchange rate was much slower in the IL than in water as distinguished by 1H NMR. When excess SO2 was absorbed by [P4448][bisulfite], the presence of molecular SO2 and HS2O5− were suggested by Raman bands as an indication of concerted physisorption and chemisorption.

SO2 capture by ionic liquid and spectroscopic speciation of sulfur(iv) therein

SO₂ capture by ionic liquid and spectroscopic speciation of sulfur(iv) therein