期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 9, 页码 3673-3680出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b06639
关键词
MoS2/chitosan aerogel; gold thiosulfate; photoreduction; chemical reduction
资金
- National Natural Science Foundation of China [51974216, 51704212, 51704220]
- Natural Science Foundation of Hubei Province [2016CFA013]
- Research Fund Program of Key Laboratory of Rare Mineral, Ministry of Land and Resources [KLRM-KF201802]
A three-dimensional porous MoS2/chitosan (MoS2/CS) aerogel with excellent mechanical strength and stability was constructed in this work through anchoring MoS2 to the surface of the CS aerogel. It is found that the MoS2/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 MoS2/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 MoS2/CS aerogel as well as the strong reducibility of photogenerated electrons.
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