Sorption of ferrous iron by EPS from the acidophilic bacterium Acidiphilium Sp.: A mechanism proposal

Authors

  • Jaime M. Tapia Universidad Arturo Prat, Facultad de Ingeniería y Arquitectura
  • Jesús Muñoz Universidad Complutense, Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica
  • Felisa González Universidad Complutense, Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica
  • María L. Blázquez Universidad Complutense, Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica
  • Antonio Ballester Universidad Complutense, Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica

DOI:

https://doi.org/10.3989/revmetalm.076

Keywords:

Acidiphilium, Bacterium, EPS, Ferrous iron, Oxalate, Sorption

Abstract


The aim of this work was to assess the uptake of Fe(II) by extracellular polymeric substances (EPS) from the acidophilic bacterium Acidiphillium 3.2Sup(5). These EPS were extracted using EDTA. EPS of A. 3.2Sup(5) loaded in sorption tests with Fe(II), were characterized using the following experimental techniques: scanning electron microscopy (SEM) with energy dispersive X-ray microanalysis (EDX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The experimental results indicate that EPS adsorb ferrous iron according to Freundlich model with a metal sorption uptake of K = 1.14 mg1-1/n L1/n g-1 and a sorption intensity of 1/n = 1.26. In addition, ferrous iron sorption by EPS took place by preferential interaction with the carboxyl group which promotes the formation of ferrous iron oxalates (FeC2O4). Since the interaction reaction was reversible (Log K = 0.77 ± 0.33), that means that the cation sorption can be reversed at convenience.

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Published

2016-09-30

How to Cite

Tapia, J. M., Muñoz, J., González, F., Blázquez, M. L., & Ballester, A. (2016). Sorption of ferrous iron by EPS from the acidophilic bacterium Acidiphilium Sp.: A mechanism proposal. Revista De Metalurgia, 52(3), e076. https://doi.org/10.3989/revmetalm.076

Issue

Vol. 52 No. 3 (2016)

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Articles

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