Light irradiation plays an important role in the oxidative dissolution of Sb 2 S 3 . 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 Sb 2 S 3 (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 Sb 2 S 3 . Photo-oxidants in the form of hydroxyl radicals ( OH ) , superoxide anion free radicals ( O 2 - ) and photo-generated holes h vb + were produced in the photo-induced oxidative dissolution reaction of Sb 2 S 3 . Among these, O 2 and O 2 - are the most significant oxidants . The main oxidation products of Sb 2 S 3 are Sb(V), S 0 and S 2 O 3 2 - . This study may help elucidate the geochemistry and fate of antimony in the environment.
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Hu et al. (2015) studied this question.
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