Deep eutectic solvents as green absorbents of volatile organic pollutants

  • Leila Moura
  • Tarek Moufawad
  • Michel Ferreira
  • Hervé Bricout
  • Sébastien Tilloy
  • Eric Monflier
  • Margarida F. Costa Gomes
  • David Landy
  • Sophie Fourmentin
Original Paper

Abstract

Volatile organic compounds are a major source of air pollutants. Absorption is an effective solution to treat polluted air loaded with volatile organic compounds, but most actual absorbents are often toxic and non-biodegradable. Here, we tested eutectic solvent mixtures for the absorption of volatile organic compounds for the first time. The affinity of solvent mixtures for toluene, acetaldehyde and dichloromethane was determined by measuring vapour–liquid partition coefficients and liquid phase absorption capacities. Results show that the vapour–liquid partition coefficients vary, at 30 °C, from close to zero for acetaldehyde in the mixtures choline chloride:urea, choline chloride:glycerol and tetrabutylphosphonium bromide:glycerol to 0.124 for dichloromethane in the choline chloride:urea eutectic mixture. These values are similar or even superior to those published for ionic liquids and organic solvents. Solvents based on choline chloride, a food additive, and urea, can solubilize up to 500 times more volatile organic compounds compare to water. Moreover, deep eutectic solvents are easier to prepare and more biodegradable than ionic liquids, which are also toxic. Deep eutectic solvents are more biodegradable than silicone oils, which are also expensive. Furthermore, in terms of recycling, the absorption capacities of the tested solvents remained unchanged during five absorption–desorption cycles. These findings are patented.

Keywords

Air pollution Absorption Deep eutectic solvent Green chemistry Remediation 

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), EA 4492 SFR Condorcet FR CNRS 3417Université du Littoral-Côte d’OpaleDunkerqueFrance
  2. 2.Univ. Artois, CNRS, Centrale Lille, ENSCL, Univ. Lille, UMR 8181Unité de Catalyse et de Chimie du Solide (UCCS)LensFrance
  3. 3.Institut de Chimie de Clermont-Ferrand, UMR 6296, CNRSUniversité Clermont AuvergneAubièreFrance

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