The permeation of gold(III), through a supported liquid membrane (SLM), in flat-sheet operational mode, impregnated with Cyphos IL101 (ionic liquid with a quaternary phosphonium salt as active substance) in Solvesso 100 has been investigated. The transport of gold(III) has been studied under various experimental conditions: stirring speed of the aqueous phases, initial metal and carrier concentrations, HCl concentration in the source phase, etc. The overall mass transfer coefficient was calculated as 0.19 cm/min and the thickness of the aqueous boundary layer was of 3.2 x 10(-3) cm. The performance of Cyphos IL101 has been studied with respect to other carriers and also the selectivity of the membrane-carrier system on various metal-bearing aqueous solutions. Gold is recovered in the strip phase as nanogold. (C) 2017 Elsevier B.V. All rights reserved.