Controllable synthesis of nanostructured BaSO4 and BaSO3 crystals on the basis of DMSO oxidation chemistry

Abstract

A simple and novel SO₂ release method for the synthesis of controllable nanostructured BaSO₄ and BaSO₃ crystals was developed based on the oxidation of HSO₃⁻ to SO₄²⁻ by dimethyl sulfoxide (DMSO) in a binary system of triethylene glycol (TEG) + DMSO. The binary system was successfully re-used for SO₂ absorption and production of BaSO₃ crystals at least three times. Aggregation and self-assembly mechanisms for the preparation of BaSO₄ and BaSO₃ crystals were proposed. This controllable synthesis strategy for BaSO₄ and BaSO₃ crystals has offered an alternative way for the comprehensive utilization of SO₂, and provided a scientific foundation for the development of DMSO oxidation chemistry.