[en] Emission of volatile organic compounds (VOCs) in the atmosphere is a major health concern for the World Health Organization (WHO). For instance, more than 4 million premature deaths are attributed yearly to outdoor air pollution, thus calling for advanced remediation techniques. Absorption systems using solvents are commonly used to remove air pollutants, yet efficiency is limited by a solvent property, which is either hydrophilic or hydrophobic. As a consequence, classical solvents are not able to capture both hydrophilic and hydrophobic contaminants. Therefore, we synthesized the following ionic liquids from choline chloride and fatty acids: hexylcholinium levulinate, octylcholinium levulinate, hexylcholinium lactate and octylcholinium lactate. Ionic liquids were then tested for absorption of toluene, dichloromethane (CH2Cl2) and methyl ethyl ketone. Ionic liquids were characterized by 1H and 13C NMR, infrared spectroscopy, differential scanning calorimetry and thermal gravimetric analysis, density, viscosity and polarity. Vapor–liquid partition coefficients of VOC were determined for ionic liquids. We found that solvents were able to solubilize both hydrophobic and hydrophilic VOC. Moreover, no saturation was detected up to an initial VOC concentration of 3000 g/m3, whereas classical absorption processes usually involve gas streams containing VOC concentrations up to 1000 g/m3. Moreover, the solvent can be successfully recycled with unchanged capacity during five absorption–desorption cycles. Overall, our solvents appear promising for the treatment of industrial gaseous effluents.
Disciplines :
Chemistry
Author, co-author :
Fahri, Fatima; Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), UR 4492, SFR Condorcet FR CNRS 3417, ULCO, Dunkirk, France
Bacha, Katia ; Université de Liège - ULiège > TERRA Research Centre ; Institut de Chimie Moléculaire (ICMR), UMR CNRS 7312, SFR Condorcet FR CNRS 3417, URCA, Reims, France
Chiki, Fadwa Fatima; Institut de Chimie Moléculaire (ICMR), UMR CNRS 7312, SFR Condorcet FR CNRS 3417, URCA, Reims, France
Mbakidi, Jean-Pierre; Institut de Chimie Moléculaire (ICMR), UMR CNRS 7312, SFR Condorcet FR CNRS 3417, URCA, Reims, France
Panda, Somenath; Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), UR 4492, SFR Condorcet FR CNRS 3417, ULCO, Dunkirk, France
Bouquillon, Sandrine; Institut de Chimie Moléculaire (ICMR), UMR CNRS 7312, SFR Condorcet FR CNRS 3417, URCA, Reims, France
Fourmentin, Sophie; Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), UR 4492, SFR Condorcet FR CNRS 3417, ULCO, Dunkirk, France
Language :
English
Title :
Air pollution: new bio-based ionic liquids absorb both hydrophobic and hydrophilic volatile organic compounds with high efficiency
This work was supported by the SFR Condorcet and the SATT Nord. We are grateful to the SFR Condorcet for material funds, Fatima Fahri and Katia Bacha internship funding, to the SATT Nord for an engineer position to Jean-Pierre Mbakidi and to ULCO for the funding of a postdoctoral position for Somenath Panda. Tarek Moufawad is greatly acknowledged for his help for polarity experiments and density and viscosity measurements.This work was supported by the SFR Condorcet and the SATT Nord. We are grateful to the SFR Condorcet for material funds, Fatima Fahri and Katia Bacha internship funding, to the SATT Nord for an engineer position to Jean-Pierre Mbakidi and to ULCO for the funding of a postdoctoral position for Somenath Panda. Tarek Moufawad is greatly acknowledged for his help for polarity experiments and density and viscosity measurements.
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