Abstract
New technologies have risen into popularity causing the Liquid membrane techniques to evolve over other separation techniques due to its high selectivity and recovery, increased fluxes, and reduced investment and operating cost. This work focuses on extracting Methylene Blue (MB), a cationic dye using a simple BLM separation technique from its aqueous phase. It combines extraction and stripping in a single unit operation. The feed phase was an aqueous solution of MB, the solvent chosen was soybean oil for the liquid/organic membrane phase, and tri-octyl amine acted as a carrier. The strip phase was a hydrochloric acid solution for this study. A two-phase equilibrium study was done to choose the correct solvent, carrier, and receiving phase (soybean oil, tri-octyl amine, and HCl) were chosen, which was then followed by a three-phase study. Effect of various parameters like equilibrium time, feed and stripping phase pH, stirring speed, carrier concentration, initial feed concentration, and strip phase concentration were all studied to find out the most optimum working condition for maximum extraction and recovery of MB. The removal efficiency of MB by using soybean oil was found as 92%, at the optimum process conditions for the transport of MB were found as follows: pH in the feed phase (11), pH in the stripping phase (5), initial concentration of MB (20 ppm), carrier concentration (7%) (v/v) TOA and stirring speed (250 rpm), respectively.
Highlights
Colorants like methylene blue are widely used in the textile, paper, plastics, food, and cosmetics industries
A typical Methylene Blue (MB) solution of 1000 mg/L was prepared, and absorbance was measured at different wavelengths to obtain a representative portion of absorbance per wavelength Fig.1 the wavelength associated with the average absorbance defined by this plot was 664 nm
The selection of compatible solvent for desired transport of the target element is a prime issue in liquid membrane techniques
Summary
Colorants like methylene blue are widely used in the textile, paper, plastics, food, and cosmetics industries. Liquid membranes (LMs) are liquids that separate two aqueous phases of the source (feed) and the receiving (product) phases and are immiscible in these phases. These separation systems are being explored widely in many fields such as organic and inorganic chemistry, wastewater treatment, chemical engineering, biomedical engineering, and biotechnology (Dargo H., et al, 2014). BLMs are often used to study novel carrier transport properties and to select suitable stripping solutions It is, the simplest of all LM configurations and offers an understanding of an LM's separation feasibility for any method of concern (Bradford A., 2015)
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