Extraction and Recovery of Different Dyes Using Green Solvents as a Liquid Membrane Medium

Abstract

In current research work, an attempt has been made for efficient transport of different dye molecules such as Crystal violet (CV) and Congo red (CR) using vegetable oil based bulk liquid membrane technique. A comprehensive kinetic study was carried out and the effect of various parameters viz. carrier concentration, strip phase concentration, stirring speed, temperature were studied. An aqueous solution of CV and CR was used as the feed phase and based on two-phase study acetic acid and sodium carbonate was chosen as the stripping agent for CV and CR respectively. Acidic condition of feed phase solution was proved effective for transport of dye molecule. The liquid membrane was prepared by using vegetable oils such as soybean and sunflower oil for CV and CR, respectively. The fundamental objective of present work is to achieve maximum extent of separation of dye molecule from feed phase with the minimal use of a carrier. This work magnificently achieves >86% extraction and >75% recovery of CV in presence of 1M phenol within 12 hrs, whereas >99% extraction and >76% recovery of CR in presence of 4 % (volume) TOA within 8 hrs. Finally, the study of membrane reusability also showed the consistent performance with 75% fresh and 25% used-membrane.