چكيده به لاتين
Solvent extraction of strategic element (known as Rare Earth Element, REE) involves several separation stages, time-consuming, possibility of emulsion formation, analyte and extractant loss and need to vigorous stirring of the two phases. Therefore, it needs to create new systems that can cover some of these disadvantages and intesify the liquid-liquid extraction process. In this research, microfluidic solvent extraction (microSX) of gadolinium was conducted using a Mono-and Di-Ester mixture (MDEHPA) as the cationic extractant. A microfluidic Y–Y channel fabricated using CO2 –laser technique in a glass microchip was used as the extraction system. Compared with batch extraction, extraction kinetic was found to be fast, extraction equilibrium was attained within 15s. Stoichiometry of the extracted complex was found to be Gd (NO3)3.3MDEHPA using log-log plot method. Additionally, the operating parameters, overall volumetric mass transfer coefficient ( k_L α) are investigated to determine the mass transfer performance. Optimum conditions of micro extraction for gadolinium using response surface methodology was determined for feed solutions 31ppm adjusted to pH 2.5, extractant concentration 2.9% (vol/vol) and extraction time 13.5 s. In optimum condition, gadolinium extraction yield was determined 95.5%. Findings of this study approved simplicity, portability, effectiveness, swiftness, and environmental friendliness microfluidic solvent extraction process and revealed micro SX is useful in the field of extraction strategic metals present in low concentrations which are otherwise not technically amenable or economically feasible to extraction using current traditional methods.
