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2020•IOP Conference Series Materials Science and EngineeringOpen access

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

Aluyah Sipi, Siu Hua Chang

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Abstract

Abstract 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.

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Abstract 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.

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Available abstract

Abstract 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.

Key concepts: Extraction (chemistry), Aqueous solution, Aqueous two-phase system, Chemistry, Methylene blue, Solvent, Chromatography, Organic chemistry

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