A three-dimensional porous MoS 2 /chitosan (MoS 2 /CS) aerogel with excellent mechanical strength and stability was constructed in this work through anchoring MoS 2 to the surface of the CS aerogel. It is found that the MoS 2 /CS aerogel can effectively recover gold from thiosulfate solution via direct in situ reduction of Au(I) to Au 0 under sunlight, thus realizing the one-step recovery of gold, which greatly benefits the development of thiosulfate leaching for gold extraction. Furthermore, according to the results of photocurrent, ultraviolet–visible absorption, and atomic absorption spectrophotometry, it has been found that the reduction of the MoS 2 /CS aerogel to Au(I) is mainly consisted of photoreduction and chemical reduction, where photoreduction plays a dominant role, primarily because of the narrow band gap and higher conduction band edge of the MoS 2 /CS aerogel as well as the strong reducibility of photogenerated electrons.
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Chen et al. (2020) studied this question.
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