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Poly(acrylic acid) coating induced 2-line ferrihydrite nanoparticle transport in saturated porous media

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Abstract

Iron oxide and iron nanoparticles (NPs) have been used effectively for environmental remediation, but are limited in their applications by strong retention in groundwater-saturated porous media. For example, delivery of NPs to large groundwater reservoirs would require large numbers of injection wells. To address this problem, we have explored polymer coatings as a surface engineering strategy to enhance transport of oxide nanoparticles in porous media. We report here on our studies of 2-line ferrihydrite NPs and the influence of poly (acrylic acid) (PAA) polymer coatings on the colloidal stability and transport in natural sand-packed column tests simulating flow in groundwater-saturated porous media. Measurements were also made of zeta potential, hydrodynamic diameter, and polymer adsorption and desorption properties. The coated NPs have a diameter range of 30–500 nm. We found that NP transport was improved by PAA coating and that the transport properties could be tuned by adjusting the polymer concentration. Our results demonstrate that a high stability of oxide particles and improved transport can be achieved in groundwater-saturated porous media by introducing negatively charged polyelectrolytes and optimizing polymer concentrations.

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Acknowledgments

The authors acknowledge support of the Andlinger Innovation Fund of the Andlinger Center for Energy and the Environment at Princeton University. The authors thank Prof. Robert Prud’homme for his valuable discussions and his group for assistance.

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Authors and Affiliations

  1. Chemical and Biological Engineering Department, Princeton University, Princeton, NJ, USA

    Aishuang Xiang & Bruce E. Koel

  2. Civil and Environmental Engineering Department, Princeton University, Princeton, NJ, USA

    Peter R. Jaffé

  3. Civil and Environmental Engineering, Texas Tech University, Lubbock, TX, USA

    Weile Yan

Authors
  1. Aishuang Xiang
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  2. Weile Yan
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  3. Bruce E. Koel
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  4. Peter R. Jaffé
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Corresponding authors

Correspondence to Bruce E. Koel or Peter R. Jaffé.

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Xiang, A., Yan, W., Koel, B.E. et al. Poly(acrylic acid) coating induced 2-line ferrihydrite nanoparticle transport in saturated porous media. J Nanopart Res 15, 1705 (2013). https://doi.org/10.1007/s11051-013-1705-3

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  • DOI: https://doi.org/10.1007/s11051-013-1705-3

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