Methyl Violet Removal from Synthetic Wastewater by Liquid-Liquid Extraction using Vegetable Oils as Solvent

Abstract

A laboratory study on methyl violet removal from aqueous solutions by liquid-liquid extraction system has been carried out, using crude palm oil and soy bean oil as solvent. The concentration of methyl violet has been studied in the range of 100 mg/L to 200 mg/L. The efficiency of dye extraction increased when two extractant di-2-ethylhexyl phosphoric acid and tributhyl phosphate were used as carrier. Under optimized conditions, 82% to 89% dye removal in 5 minutes rapid mix followed by 60 minutes slow mixing was achieved. The aqueous to organic phase volume ratio (A/O) was fixed at 1, pH varied from 1-6 and extraction study was carried out at (TBP): 200mM and (D2EHPA): 75mM.