Toxicity and biodegradability of ionic liquids / Guillermo Quijano in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011)  

Toxicity and biodegradability of ionic liquids : New perspectives towards whole - cellbiotechnological applications [texte imprimé] / Guillermo Quijano, Auteur ; Annabelle Couvert, Auteur ; Abdeltif Amrane, Auteur . - 2012 . - pp.27-32.
Génie chimique
Langues : Anglais (eng)
in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.27-32

Mots-clés :	Environment Ionic liquids Toxicity Activated sludge
Résumé :	The potential of four ILs for whole-cellbiotechnological processes was evaluated in terms of toxicity and biodegradability. From the four ILs tested, only Aliquat completely inhibited the microbial glucose uptake at a concentration of 5%, while [PEGMIM][PF6] was completely soluble in water. Therefore, these ILs were discarded for further studies. On the other hand, [BMIM][PF6] and [BMIM][NTF2] were not toxic at a concentration of 5% (v/v) (specific concentrations of 170 and 180 gIL gBiomass−1, respectively), while IL addition at 10% (v/v) slightly inhibited the metabolic activity relative to controls deprived of IL. Addition of both [BMIM][PF6] and [BMIM][NTF2] produced an acclimation time of approximately 24 h before the microorganisms were able to uptake the substrate. Further experiments on IL toxicity due to long-term fluoride (F−) release showed that despite the fact that F− was detected in the aqueous phase, its concentration was very low (≤2.98 mg L−1) and hence not toxic for the microorganisms. Finally, short- and long-term biodegradability tests showed that neither [BMIM][PF6] nor [BMIM][NTF2] was biodegradable. Therefore, [BMIM][PF6] and [BMIM][NTF2] can be considered as compatible with whole-cellbiotechnological processes.
ISSN :	1385-8947
En ligne :	http://www.sciencedirect.com/science/article/pii/S1385894711008990