Add time:08/21/2019         Source:sciencedirect.com

Light irradiation plays an important role in the oxidative dissolution of Sb2S3. A qualitative mechanism was proposed through simulated experiments to describe the dissolution reaction under various ambient conditions, specifically darkness/light and aerobic/anaerobic conditions. The pH-dependent solubility of Sb2S3(s) and photo-induced oxidative dissolution are two types of reaction mechanisms. The oxidation of Sb(III) and its sulfides by light irradiation induce the prompt dissolution of Sb2S3. Photo-oxidants in the form of hydroxyl radicals (OH), superoxide anion free radicals (O2-) and photo-generated holes hvb+ were produced in the photo-induced oxidative dissolution reaction of Sb2S3. Among these, O2 and O2- are the most significant oxidants. The main oxidation products of Sb2S3 are Sb(V), S0 and S2O32-. This study may help elucidate the geochemistry and fate of antimony in the environment.

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