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Analytical Strategies for Monitoring Ionic Liquids Breakdown by Electro-Fenton Process
Poster Title: Analytical Strategies for Monitoring Ionic Liquids Breakdown by Electro-Fenton Process
Submitted on 31 Mar 2016
Author(s): Elisa González-Romero*, Elvira Bocos, Jessica Meijide, Aida Díez, Marta Pazos, María Ángeles Sanromán
Affiliations: Departments of Chemical Engineering & Analytical and Food Chemistry*, University of Vigo-Campus Vigo, 36310 Vigo, Spain
This poster was presented at Environmental Water Quality and Analysis (March 8, 2016 morning)
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Poster Information
Abstract: Improving the framework of green chemistry principles, it should be necessary to decrease the major sources of waste as volatile organic solvent (VOS) losses that end up in the atmosphere or in ground water, mainly caused by their use in industrial applications. Owing to their low volatility, the ionic liquids (ILs) have been regarded as greener replacements of the traditional VOS, since their contribution to the air pollution can be effectively reduced. Unfortunately, their high solubility makes their entrance in water very easy. Furthermore, ILs has low biodegradability; this is the major reason why they have become a new threat for the aquatic ecosystems. This urges new efforts and the development of new strategies to eliminate the ILs from water at an acceptable cost, in a short time and with the least possible environmental and social impact. In this work, we illustrate the application of electro-Fenton for the degradation of several ILs. This technique is based on Fenton reaction by the action of a powerful oxidizing agent, hydroxyl radical, generated on the electrochemical process. In order to determine the pathways of the reactions that take places in the degradation process, it is necessary to determine the evolution of the composition of the samples along the treatment. For that, chromatographic analysis (Ionic/Ion-Exclusion HPLC and GC/MS) were performed. A number of others analytical techniques, including UV-Vis Spectrometry, voltammetry, conductivity and potentiometry, are also used in our methodology to get insight into the degradation pathways of the ILs under study. The energy consumption and the measurement of the Total Organic Carbon (TOC) of the studied aqueous solution containing the ILs are also calculated.

Acknowledgements: Financial support from Spanish/European Institutions MINECO/FEDER (Project CTM2014-52471-R) and XUNTA (ReGaLIs R2014/015 and Bioauga R2014/030 Networks). The authors are grateful to Pepe Lamas for his helpful hands in the laboratory
Summary: We have developed a very simple and promising electroanalytical methodology based on Voltammetric detection and Screen-Printed Electrodes technology, for the easy monitoring of non-electroactive pollutants during the electro-Fenton degradation process. The advantages of this approach are
1 Rapid, sensitive, robust, stable and disposable Fe(III) sensors
2 Development of a sensing probe to monitor the ILs degradation based on ionic pair formation
3 The plausible degradation pathway is
References: selected published results:

RSC Advance 2015, 5, 31049-31056 DOI: 10.1039/c5a03050a

Applied Catalysis B: Environmental 2016, 180, 544-550
DOI: 10.1016/j.apcatb.2015.07.011
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