Extraction of Methylene Blue from Aqueous Solutions by Waste Cooking Oil and its Back-Extraction

• Published in: IOP Conference Series: Materials Science and Engineering
• Main Author: Sipi A.K.M.; Chang S.H.
• Format: Conference paper
• Language: English
• Published: Institute of Physics Publishing 2020
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85085197936&doi=10.1088%2f1757-899X%2f811%2f1%2f012001&partnerID=40&md5=bbb0356eba22be3ad315af98e4fe8220

This work aimed to use waste cooking oil as a greener replacement for the petroleum-based solvents in removing methylene blue (MB) from aqueous solutions by solvent extraction. The effects of different extraction parameters such as equilibrium pH, aqueous to organic phase ratio, and initial MB concentration on the extraction of MB from aqueous solutions by waste cooking oil were investigated. The back-extraction of MB from MB-loaded waste cooking oil was also explored. The maximum extraction (∼90%) and back-extraction (>90%) of MB were attained at equilibrium pH of 8, aqueous to organic phase ratio of 1:1, initial MB concentration of 20 mg/L, and with 1 M of sodium bicarbonate as the back-extraction agent. © Published under licence by IOP Publishing Ltd.