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Separation of chlorinated biocides from aqueous effluents using ionic liquids

Authors: Weidlich Tomáš | Štěpánková Michaela

Year: 2016

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Separation of chlorinated biocides from aqueous effluents using ionic liquids	3,6-Dichloro-2-pyridinecarboxylic acid (Clopyralid) is selective herbicide widely used for control of broadleaf weeds. 2-(4-Chlorophenoxy)-2-methylpropanoic acid (Clofibric acid) is used as plant growth regulator, moreover, it is a metabolite of the cholesterol-lowering pharmaceutical drug Clofibrate. Both these mentioned acids are quite water soluble and persistent compounds. Their concentration can be evaluated for example using AOX (adsorbable organic halides) parameter. In this work adsorption using charcoal as standard technique was tested for removal of both mentioned biocides and it was compared with the new method based on precipitation of acidic biocides caused by addition of suitable ionic liquid [1-3]. The new technique based on application of ionic liquids as liquid ion exchangers was successfully tested for facile removal of Clopyralid and Clofibric acid in quite broad pH range from model wastewater streams. The attempts for recycling of used ionic liquids from isolated organic phase were performed. It was proved that hydrophobic ionic liquids (for example Aliquat 336) are the most effective precipitation agents for the facile removal of low concentrations of studied biocides from contaminated water.	clopyralid; clofibric acid; picloram