1. Gold(III) extraction and recovery and gold(III)/copper(II) separation using micelles.
- Author
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Aydinoglu, Sabriye, Biver, Tarita, Ceccarini, Alessio, Secco, Fernando, and Venturini, Marcella
- Subjects
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EXTRACTION (Chemistry) , *GOLD , *AQUEOUS solutions , *MICELLES , *SEPARATION (Technology) , *ULTRAFILTRATION , *ELECTROSTATIC interaction - Abstract
Gold extraction from aqueous solutions has been performed by micellar enhanced ultrafiltration (MEUF), using SDS and DTAC micelles. DTAC entraps 92–100% of the metal, which is present in form of AuCl 4 − , owing to electrostatic interaction. Using SDS the extraction of gold is unsuccessful. However, addition of PADA, as a metal extractor agent, according to the ligand modified micellar enhanced ultrafiltration (LM-MEUF) procedure, makes the extraction yield to approach 100% also with SDS. The recovery of gold entrapped in the micellar pseudo-phase has also been investigated. Different stripping agents have been used, the most efficient of them being a mixture of NaCl and NH 3 which allowed the metal to be expelled from the micelle with a yield of 85%. Finally, Au(III)/Cu(II) separation is achieved with DTAC or SDS between pH 3 and 5. Almost 100% of Au(III) is retained on DTAC micelles while all Cu(II) remains in the aqueous medium, while the opposite occurs in SDS. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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