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Iron-pillared clays as catalysts for dye removal by the heterogeneous photo-Fenton technique

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Abstract

The catalytic activity of iron pillared montmorillonitic clays in the discoloration of methylene blue aqueous solutions by the heterogeneous photo-Fenton process was studied. Catalysts were prepared using two different-sized aggregate fractions of the clay, ranging below 250 μm and within the range of 250–450 μm. Two calcination temperatures, 400 and 600 °C, were used. The solids were characterized by thermo-gravimetric analysis, nitrogen adsorption isotherms, elemental analysis, X-ray diffraction and iron content. A higher specific surface area and specific pore volume were found for the solid obtained from the finer aggregates of the clay and the lowest calcination temperature. Under photo-Fenton like conditions, this catalyst also displayed the highest catalytic activity which remained practically the same at pHs 3.0 and 5.6 and for H2O2 concentrations in the range from 5 to 20 mM. The observed differences in catalytic performance can be explained on the basis of the catalysts’ iron content and textural properties. Leaching of iron ions from the catalysts could not be detected. Long term stability for dye waste water treatment could thus be expected for these catalysts.

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Acknowledgments

This research was funded by Comisión Sectorial de Investigación Científica (CSIC), Universidad de la República, Uruguay. The authors thank to Departamento Estrella Campos, Facultad de Química, Universidad de la República for performing atomic absorption spectroscopy for iron content determination and ultimate analysis for carbon determination.

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Authors and Affiliations

  1. Laboratorio de Fisicoquímica de Superficies, Departamento de Teoría y Experimentación de la Materia y sus Aplicaciones, Facultad de Química, Universidad de la República, Gral. Flores 2124, CC 1157, CP 11800, Montevideo, Uruguay

    María Andrea De León, Marta Sergio & Juan Bussi

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  1. María Andrea De León
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  2. Marta Sergio
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  3. Juan Bussi
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Correspondence to María Andrea De León.

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De León, M.A., Sergio, M. & Bussi, J. Iron-pillared clays as catalysts for dye removal by the heterogeneous photo-Fenton technique. Reac Kinet Mech Cat 110, 101–117 (2013). https://doi.org/10.1007/s11144-013-0593-y

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