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Using iron-loaded sepiolite obtained by adsorption as a catalyst in the electro-Fenton oxidation of Reactive Black 5

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Abstract

This study explores the possibility of using iron-loaded sepiolite, obtained by recovering iron from polluted water, as a catalyst in the electro-Fenton oxidation of organic pollutants in textile effluents. The removal of iron ions from aqueous solution by adsorption on sepiolite was studied in batch tests at iron concentrations between 100 and 1,000 ppm. Electro-Fenton experiments were carried out in an electrochemical cell with a working volume of 0.15 L, an air flow of 1 L/min, and 3 g of iron-loaded sepiolite. An electric field was applied using a boron-doped diamond anode and a graphite sheet cathode connected to a direct current power supply with a constant potential drop. Reactive Black 5 (100 mg/L) was selected as the model dye. The adsorption isotherms proved the ability of the used adsorbent. The removal of the iron ion by adsorption on sepiolite was in the range of 80–100 % for the studied concentration range. The Langmuir and Freundlich isotherms were found to be applicable in terms of the relatively high regression values. Iron-loaded sepiolite could be used as an effective heterogeneous catalyst for the degradation of organic dyes in the electro-Fenton process. Successive batch processes were performed at optimal working conditions (5 V and pH 2). The results indicate the suitability of the proposed combined process, adsorption to iron remediation followed by the application of the obtained iron-loaded sepiolite to the electro-Fenton technique, to oxidize polluted effluents.

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Acknowledgments

This work was supported by the Spanish Ministry of Economy and Competitiveness and FEDER funds (CTM2011-26423). The authors are thankful to the Ramón y Cajal program for the financial support to Marta Pazos and to C.A.C.T.I. from Vigo University for providing access to their electron microscopy service.

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  1. Department of Chemical Engineering, University of Vigo, Isaac Newton Building, Campus As Lagoas Marcosende, 36310, Vigo, Spain

    O. Iglesias, M. A. Fernández de Dios, M. Pazos & M. A. Sanromán

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  1. O. Iglesias
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  2. M. A. Fernández de Dios
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  3. M. Pazos
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  4. M. A. Sanromán
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Correspondence to M. A. Sanromán.

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Iglesias, O., Fernández de Dios, M.A., Pazos, M. et al. Using iron-loaded sepiolite obtained by adsorption as a catalyst in the electro-Fenton oxidation of Reactive Black 5. Environ Sci Pollut Res 20, 5983–5993 (2013). https://doi.org/10.1007/s11356-013-1610-4

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