Facet engineering in cadmium sulfide for efficient reduction-recovery of low-concentration gold(I) from thiosulfate solutions
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abstract
Trace gold(I) recovery from thiosulfate solutions limits the application of thiosulfate leaching instead cyanide leaching method in industries. Here, facet engineering in cadmium sulfide (CdS) was proposed for trace gold(I) recovery from thiosulfate solutions (Au(S2O3)23−). CdS nanomaterials with various exposing facets were obtained through adjusting the sulfur sources in hydrothermal synthesis process. It was found that Au(S2O3)23− recovery could reach 98.62 %25 under low concentration conditions, with a max reduction capacity of 204.95 mg/g. Besides, the recovery form of Au(S2O3)23− on CdS was metallic gold, realizing the reduction and recovery at the same time. The solution pH, sample dosage, S2O32−, SO32−, and ammonia ions as variants were considered to optimize the recovery performances. Even under the existence of interfered ions, the recovery kept very high. Au(S2O3)23− reduction on CdS was attributed to catalytic and chemical reduction. High exposed (0 0 2) facet content of CdS enhanced photocurrent intensity, thus improving Au(S2O3)23− reduction and recovery. Therefore, the work paved a way to realize trace gold(I) recovery from thiosulfate solutions via structure engineering in CdS, being expected to promote the application of thiosulfate leaching method.
