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Heterogeneous electro-Fenton catalyst for 1-butylpyridinium chloride degradation

Abstract

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.

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Funding

This research has been funded by the Spanish Ministry of Economy and Competitiveness MINECO and ERDF Funds (Projects CTM2014-52471-R).

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Correspondence to Maria Ángeles Sanromán.

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Responsible editor: Vítor Pais Vilar

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Meijide, J., Pazos, M. & Sanromán, M.Á. Heterogeneous electro-Fenton catalyst for 1-butylpyridinium chloride degradation. Environ Sci Pollut Res 26, 3145–3156 (2019). https://doi.org/10.1007/s11356-017-0403-6

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Keywords

  • Electro-Fenton
  • Heterogeneous catalyst
  • Pyridinium-based ionic liquid
  • Toxicity