Abstract Magnetic MoS2 could be easily separated from water or solid suspensions. In this work, shell-core structured MoS2@Fe3O4 composite was fabricated through hydrothermal method and used as catalyst for recovering gold-thiosulfate complex ions (Au(S2O3)23−) in aqueous solution. The results suggested that MoS2@Fe3O4 composite could effectively in-situ reduce Au(S2O3)23− to gold particles (Au0) with an extremely high reduction capacity of 1541.1 mg/g; moreover, the gold loaded MoS2@Fe3O4 could be easily collected using a magnetic separator. The mechanism of reducing Au(S2O3)23− to Au0 was ascribed to the photoexcited electrons from MoS2@Fe3O4 composite. More importantly, the incorporation of Fe3O4 could effectively enhance the transferred efficiency of photoexcited electrons and accelerate separation of electrons-holes pairs. With great gold reduction capacity and magnetic recyclability, the MoS2@Fe3O4 composite could be a promising material for recovering gold from leaching solutions.

中文翻译：

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原位还原 Au(S2O3)23− 以利用磁可分离壳核结构的 MoS2@Fe3O4 复合材料有效回收金

摘要 磁性二硫化钼可以很容易地从水或固体悬浮液中分离出来。在这项工作中，通过水热法制备了壳核结构的 MoS2@Fe3O4 复合材料，并将其用作回收水溶液中金-硫代硫酸盐络离子 (Au(S2O3)23-) 的催化剂。结果表明，MoS2@Fe3O4复合材料可以有效地将Au(S2O3)23-原位还原成金颗粒(Au0)，还原能力高达1541.1 mg/g；此外，使用磁选机可以轻松收集负载金的 MoS2@Fe3O4。将 Au(S2O3)23- 还原为 Au0 的机制归因于来自 MoS2@Fe3O4 复合材料的光激发电子。更重要的是，Fe3O4的掺入可以有效提高光激发电子的转移效率，加速电子-空穴对的分离。