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Solubilization of seven hydrophobic pesticides in quaternary ammonium based eco-friendly ionic liquids aqueous system

Abstract

In this work, quaternary ammonium based ionic liquids (ILs) are proved to be good candidates of green solvents/ solubilizers for pesticide formulations. The surface activity of the six ionic liquids ([M3CnN]X, M=CH3, n=10, 12, 14, X= Cl, Br) was tested, along with the their corresponding critical aggregation concentration (CAC), lowest surface tension (γCAC), maximum surface excess concentration (Γmax), minimum area per molecule (Amin) and higher adsorption efficiency (pC20) were measured by several methods (e.g. surface tension measurement, electrical conductivity measurement, steady-state fluorescence measurements and 1H NMR). The thermodynamic parameters of micellization, the viscosity and activation energy of the six 30% ILs aqueous in the temperatures of 288K-308K were determined and calculated. The results indicated that the solubility of representative pesticides (metolachlor, acetochlor, clethodim, thiamethoxam, prochloraz, acetamiprid and fosthiazate) in different concentrations of those ILs were significantly higher than that in pure water, especially for prochloraz (e.g. 137.2 g• L-1 in 30% C10Br, 4035-fold higher than that in pure water). The microenvironment between pesticide and micelle was investigated through 1H NMR technique, revealing that micelle localization of pesticide molecules and the change of micelle conformation occurred in the dissolving process.

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Publication details

The article was received on 29 Apr 2017, accepted on 07 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ01445G
Citation: New J. Chem., 2017, Accepted Manuscript
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    Solubilization of seven hydrophobic pesticides in quaternary ammonium based eco-friendly ionic liquids aqueous system

    C. Chen, F. Liu, T. Fan, Q. Zhou and Q. Peng, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01445G

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