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Electrokinetics and Zero Valent Iron Nanoparticles: Experimental and Modeling of the Transport in Different Porous Media

  • Helena I. GomesEmail author
  • José M. Rodríguez-Maroto
  • Alexandra B. Ribeiro
  • Sibel Pamukcu
  • Celia Dias-Ferreira

Abstract

In this chapter are presented both the experimental results of nZVI transport under electric fields, on mixtures of kaolin and glass beads to represent different porous media, and a generalized physicochemical and numerical model of this transport.

In the experiments, a low-level direct current was used to enhance the transport of poly(acrylic acid) sodium salt (PAA)-coated nZVI in a modified electrophoretic cell. The cell was equipped with internal auxiliary electrodes and a silver chloride reference electrode. The results showed that there were higher concentrations of iron across the test bed when the direct current was applied.

The model consists in the Nernst–Planck coupled system of equations, which accounts for the mass balance equation of ionic species in a fluid medium when diffusion and electromigration are considered in the ions transport process. In the case of the nZVI (with a negative charge), diffusion, and electrophoretic terms were taken into account. In all the cases, the electroosmotic flow was included in the equation. The use of electrical current to transport the nanoparticles prevents or hinders the nZVI particle aggregation, increasing their mobility. However, opposing directions of electrophoretic transport of negatively charged particles and the electroosmotic advection still produces low nZVI transport. To enhance the transport in soils with high electroosmotic conductivities, we suggest neutrally charged and stabilized nanoparticles that could be transported mainly by electroosmotic advection.

Keywords

Electrokinetics nZVI Porous media Model Nernst–Planck equations Electroosmosis 

Notes

Acknowledgments

This work has been funded by the research grant SFRH/BD/76070/2011, by project PTDC/AGR-AAM/101643/2008 NanoDC under Portuguese National funds through “Fundação para a Ciência e a Tecnologia” and by FP7-PEOPLE-IRSES-2010-269289-ELECTROACROSS. The Department of Civil and Environmental Engineering at Lehigh University is acknowledged for the funding of equipment development, testing, and analysis of the nZVI transport experiments.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Helena I. Gomes
    • 1
    • 2
    • 3
    Email author
  • José M. Rodríguez-Maroto
    • 4
  • Alexandra B. Ribeiro
    • 1
  • Sibel Pamukcu
    • 5
  • Celia Dias-Ferreira
    • 2
  1. 1.CENSE, Departamento de Ciências e Engenharia do Ambiente, Faculdade de Ciências e TecnologiaUniversidade Nova de LisboaCaparicaPortugal
  2. 2.CERNAS—Research Center for Natural Resources, Environment and Society, Escola Superior Agraria de Coimbra, Instituto Politecnico de CoimbraCoimbraPortugal
  3. 3.Department of Civil EngineeringTechnical University of DenmarkLyngbyDenmark
  4. 4.Department of Chemical EngineeringUniversity of MálagaMálagaSpain
  5. 5.Department of Civil and Environmental EngineeringLehigh UniversityBethlehemUSA

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