Selective Recovery of Au(III) from Binary Metal Solution Using Aliquat-336-Impregnated Alginate Capsule

Wei Wei; Myung Hee Song; Sok Kim; John Kwame Bediako; Yeoung Sang Yun

doi:10.4028/www.scientific.net/AMR.1130.511

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Selective Recovery of Au(III) from Binary Metal Solution Using Aliquat-336-Impregnated Alginate Capsule

Abstract:

Aliquat-336-impregnated alginate capsule (Aliquat-336-AC) was fabricated using a facile method. Ionic liquid Aliquat-336 was used as a model extractant owing to its good extraction performance toward precious metals (PMs). Aliquat-336-AC was prepared by dropping the mixture solution (Aliquat-336 + Tween 80 + CaCl₂) into the alginate solution. CaCl₂ was used to form Ca-alginate shell, leading to Aliquat-336-AC. Two types of binary metal solutions, Au (III)/Pt (IV) and Au (III)/Pd (II) were used to evaluate metal sorption capacity of Aliquat-336-AC. The maximum Au (III) uptake in Au (III)/Pt (IV) and Au (III)/Pd (II) systems were 61.38 and 82.97 mg/g, respectively. Whereas, the uptakes of Pt (IV) and Pd (II) were almost closed to zero, indicating excellent Au (III) selectivity of Aliquat-336-AC. A comparative study was carried out between liquid/liquid extraction (LLE) using Aliquat-336 and solid/liquid adsorption (SLA) using Aliquat-336-AC for Au (III) selective recovery from Au (III)/Pt (IV) and Au (III)/Pd (II) solutions. The data of selectivity coefficients (α_sel) showed that the values of α_Au/_Pt and α_Au/_Pd were 10253.34 and 5817.61 in the SLA system, respectively. These values were much higher than 2033.38 of α_Au/_Pt and 1879.80 of α_Au/_Pd in the LLE system. Therefore, Aliquat-336-AC can be used as a selective adsorbent for Au (III).