Construction of Magnetic S-Doped CoWO4 Composite for Efficient and Selective Recovery of Gold from Wastewater via Adsorption-Reduction Pathway

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Minghu Zhao
  • Ruijie Yang
  • Chen Wang
  • Chao Xiong
  • Hao Li
  • Rongshu Zhu
  • Shixing Wang

Detail(s)

Original languageEnglish
Article number2300039
Journal / PublicationSmall Structures
Publication statusOnline published - 27 Jun 2023

Abstract

The design and synthesis of efficient adsorbents for the recovery of precious metals from secondary resources are of great environmental and economic significance. Herein, a magnetic sulfur-doped composite CoFe2O4@S-CoWO4 (CF@S-CoWO4) is developed through a hydrothermal synthesis method, which is used to selectively recover gold in aqueous media. Significantly, CF@S-CoWO4 exhibits the best overall performance with gold ions adsorption capacity (Qmax) and distribution coefficient (Kd) are 1049 mg g-1 and 4.4 x 106) mL g-1, respectively, which are much higher than those of other gold adsorption materials. The selectivity coefficients (K) toward other metal ions (Pd2+, Ca2+, Mg2+, Cd2+, Al3+, Li+, Ni+) are also higher, which suggests that CF@S-CoWO4 had a preferential selectivity for Au3+ in coexisting ion solutions. Moreover, the antianion interference of the composite follows the order: SO42- > PO43- > NO3- > CO32-, and it also shows very good reusability with adsorption efficiency at 81.78% after four repeated cycles. Based on characterizations and calculation, it is found that Au(III) mainly undergoes chelation and reduction reactions in the S sites in CF@S-CoWO4, which indicates the important role of S sites. Hence the CF@S-CoWO4 composite demonstrates a promising application for the recycling of gold ions from electronic wastewater. © 2023 The Authors. Small Structures published by Wiley-VCH GmbH

Research Area(s)

  • adsorption, CoWO4, gold, magnetic behaviour, S-doped composites, HEAVY-METAL IONS, AQUEOUS-SOLUTION, ORGANIC FRAMEWORKS, HIGHLY EFFICIENT, AU(III) ADSORPTION, AU III, REMOVAL, MOF, GOLD(III), SULFUR

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