Lorena Villar Blanco , Olalla González Sas , Pablo B. Sánchez , Ángeles Domínguez Santiago , Begoña González de Prado
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Congo red recovery from water using green extraction solvents
Dyes are pollutants widely used in several industries that end up dumped as wastewater, contributing to water pollution. In the scope of improving water quality, liquid-liquid extraction is a separation technique widely used to remove pollutants from water, due to the possibility of recovering all the involved agents. In this work, deep eutectic solvents (DESs) based on mixtures of thymol with menthol, coumarin, octanoic acid and decanoic acid were applied as extraction agents to remove congo red from water. Among all the studied solvents, those formed by thymol with organic acids showed extraction efficiencies higher than 90% for low initial concentrations of congo red, using 1/5 (v/v) DES/water proportion and 1 h of stirring time as extraction parameters. The best results were achieved using Thymol:Octanoic acid (1:1) solvent. Furthermore, at the end of the process each reagent can be reused. DES reusability was checked for three extraction cycles, keeping stable.
期刊介绍：
Water Resources and Industry moves research to innovation by focusing on the role industry plays in the exploitation, management and treatment of water resources. Different industries use radically different water resources in their production processes, while they produce, treat and dispose a wide variety of wastewater qualities. Depending on the geographical location of the facilities, the impact on the local resources will vary, pre-empting the applicability of one single approach. The aims and scope of the journal include: -Industrial water footprint assessment - an evaluation of tools and methodologies -What constitutes good corporate governance and policy and how to evaluate water-related risk -What constitutes good stakeholder collaboration and engagement -New technologies enabling companies to better manage water resources -Integration of water and energy and of water treatment and production processes in industry
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