Heterogeneous electro-Fenton catalyst for 1-butylpyridinium chloride degradation
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The application of the electro-Fenton process for organic compound mineralisation has been widely reported over the past years. However, operational problems related to the use of soluble iron salt as a homogeneous catalyst involve the development of novel catalysts that are able to operate in a wide pH range. For this purpose, polyvinyl alcohol-alginate beads, containing goethite as iron, were synthesised and evaluated as heterogeneous electro-Fenton catalyst for 1-butylpyridinium chloride mineralisation. The influence of catalyst dosage and pH solution on ionic liquid degradation was analysed, achieving almost total oxidation after 60 min under optimal conditions (2 g/L catalyst concentration and pH 3). The results showed good catalyst stability and reusability, although its effectiveness decreases slightly after three successive cycles. Furthermore, a plausible mineralisation pathway was proposed based on the oxidation byproducts determined by chromatographic techniques. Finally, the Microtox® test revealed notable detoxification after treatment which demonstrates high catalyst ability for pyridinium-based ionic liquid degradation by the electro-Fenton process.
KeywordsElectro-Fenton Heterogeneous catalyst Pyridinium-based ionic liquid Toxicity
This research has been funded by the Spanish Ministry of Economy and Competitiveness MINECO and ERDF Funds (Projects CTM2014-52471-R).
- Kaiser KLE, Palabrica VS (1991) Photobacterium phosphoreum toxicity data index. Water Pollut Res J Can 26:361–431Google Scholar
- Pieczynska A, Ofiarska A, Borzyszkowska AF, Bialk-Bielinska A, Stepnowski P, Stolte S, Siedlecka EM (2015) A comparative study of electrochemical degradation of imidazolium and pyridinium ionic liquids: a reaction pathway and ecotoxicity evaluation. Sep Purif Technol 156:522–534CrossRefGoogle Scholar
- Stolte S, Abdulkarim S, Arning J, Blomeyer-Nienstedt AK, Bottin-Weber U, Matzke M, Ranke J, Jastorff B, Thöming J (2008) Primary biodegradation of ionic liquid cations, identification of degradation products of 1-methyl-3-octylimidazolium chloride and electrochemical wastewater treatment of poorly biodegradable compounds. Green Chem 10:214–224 Google Scholar
- Vilar VJP, Moreira FC, Ferreira ACC, Sousa MA, Gonçalves C, Alpendurada MF, Boaventura RAR (2012) Biodegradability enhancement of a pesticide-containing bio-treated wastewater using a solar photo-Fenton treatment step followed by a biological oxidation process. Water Res 46:4599–4613CrossRefGoogle Scholar
- WHO (2011) Guidelines for drinking-water quality. WHO Library Google Scholar
- Zazou H, Oturan N, Sönmez-Çelebi M, Hamdani M, Oturan MA (2015) Study of degradation of the fungicide imazalil by electro-Fenton process using platinum and boron-doped diamond electrodes. J Mater Environ Sci 6:107–113Google Scholar