e-journal

Transport of carboxymethyl cellulose stabilized iron nanoparticles in porous media: Column experiments and modeling

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Abstract.
Carboxymethyl cellulose (CMC) can facilitate in situ delivery of zero-valent iron (ZVI) nanoparticles in
contaminated aquifer. This work investigated transport of CMC-stabilized ZVI nanoparticles (CMC-Fe)
using column breakthrough experiments and model simulations. The nanoparticles (18.1 ± 2.5 nm) were
transportable through four saturated model porous media: coarse and fine glass beads, clean sand, and
sandy soil. The transport data were interpreted using both classical filtration theory and a modified convection–dispersion equation with a first-order removal rate law. At full breakthrough, a constant concentration plateau (Ce/C0) was reached, ranging from 0.99 for the glass beads to 0.69 for the soil. While
Brownian diffusion was the predominant mechanism for particle removal in all cases, gravitational sedimentation also played an important role, accounting for 30% of the overall single-collector contact efficiency for the coarse glass beads and 6.7% for the soil. The attachment efficiency for CMC-Fe was found to be 1–2 orders of magnitude lower than reported for ZVI nanoparticles stabilized with other commercial
polymers. The particle removal and travel distance are strongly dependent on interstitial flow velocity,
but only modestly affected by up to 40 mM of calcium. Simulation results indicate that once delivered,
99% of the nanoparticles will be removed by the soil matrix within 16 cm at a groundwater flow velocity
of 0.1 m/day, but may travel over 146 m at flow velocity of 61 m/day.

Keywords:
Chlorinated solvents
Fate and transport
Groundwater remediation
Nanoparticle
Zero-valent iron
ZVI

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 334 (2009) 96–102

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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