Studies Regarding Au(III) Extraction in Aqueous Two Phase Systems Based on Polyethylen Glycol with Different Molecular Weights
Journal Title: BULETINUL INSTITUTULUI POLITEHNIC DIN IASI, CHIMIE SI INGINERIE CHIMICA - Year 2017, Vol 63, Issue 1
Abstract
This study presents the efficiency of Au(III) ions extraction in aqueous two phase systems (ATPS) based on polyethylene glycol (PEG) 40% (w/w) and (NH4)2SO4 40% (w/w), in the presence of chloride ions with a concentration of 0.5 mol/L as extracting agents and a pH of 4.5 of the inorganic salt. The influence of two experimental parameters was studied: PEG molecular weight and volume ratio between the two phases. Experimental results showed that with the increasing of the PEG molecular weight the quantity of Au(III) ions extracted in PEG rich phase increases (67.78% for PEG(2000), 75% for PEG(4000) and 86.19% for PEG(6000), values obtained for a volume ratio (NH4)2SO4 : PEG of 5:4). Also, the extraction efficiency showed an important decrease for a (NH4)2SO4 : PEG volume ratio >2 because of the hydrophobicity of the environment that decreases
Authors and Affiliations
LAURA BULGARIU, MĂDĂLINA GHERCĂ
Keywords
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