Four bisazole-based deep eutectic solvents (DESs) consisting of 1ethyl-3-methylimidazolium chloride and azoles are prepared for the efficient absorption and conversion of SO 2 . These DESs can not only absorb SO 2 up to 1.402 g/g at 20 °C and 1 bar but can also serve as catalysts for the cycloaddition of SO 2 with epoxides. Moderate to good yields of cyclic sulfites are acquired for varied epoxides under mild conditions (60 °C and 1 bar of SO 2 ) without any additives.

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