Extraction of Uranium (VI) with Triton X-۱۰۰/Tween-۴۰/D۲EHPA/ BMIMMeSO۴: Factorial Design Optimization from Cloud Point

This work reports the Uranyl (UO۲۲+) extraction from water by the Triton X-۱۰۰ / Tween-۴۰ / D۲EHPA / BMIMMeSO۴ by two aqueous phases or Cloud Point Extraction (CPE). The procedure has been developed to extract uranium (VI) using a mixture of non-ionic surfactants: Triton X-۱۰۰ and Tween-۴۰ in different contexts, and a mixture of lipophilic chelating extracting agent D۲EHPA/ BMIMMeSO۴. The UO۲۲+ sample was analyzed by UV-Visible spectroscopy. A mixture of ۱۰۰ µL of Arsenazo III and ۱۰۰ µL of UO۲۲+ in a medium whose pH was equal to ۲.۰. The interaction product of Arsenazo III with UO۲۲+ was determined at λmax= ۶۵۳ nm. Three key variables: initial pH value, ion strength, and initial uranyl concentration have been studied by the ۳۳ factorial design methods, in order to find the optimum conditions for uranium (VI) extraction. The temperature, the time, and the concentrations of Triton X-۱۰۰ and Tween-۴۰ were fixed: T =۲۵°C, time = ۲۴ hours, Triton X-۱۰۰ (۸%), and Tween-۴۰ (۲%). The optimal extraction of uranium (VI) by Micelle-Mediated Extraction (CPE) procedure was obtained for pH= ۳.۰, Na۲SO۴ (% w/w) = ۹.۰, and [UO۲۲+] = ۵.۵۰ mM. This system has research value and application in wastewater treatment.

Keywords:

Cloud point extraction , Uranyl ion , Triton X-۱۰۰ , Tween ۴۰ , D۲EHPA , Design of Experiments (DoE)