Transport of Iron Oxide Colloids in Packed Quartz Sand Media: Monolayer and Multilayer Deposition

The transport and deposition dynamics of hematite (α-Fe2O3) colloids in packed quartz sand media are investigated. Column transport experiments were carried out at various solution ionic strengths, colloid concentrations, and flow velocities. A colloid transport model was proposed that includes the...

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Veröffentlicht in:Journal of colloid and interface science 2000-11, Vol.231 (1), p.32-41
Hauptverfasser: Kuhnen, Florian, Barmettler, Kurt, Bhattacharjee, Subir, Elimelech, Menachem, Kretzschmar, Ruben
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container_issue 1
container_start_page 32
container_title Journal of colloid and interface science
container_volume 231
creator Kuhnen, Florian
Barmettler, Kurt
Bhattacharjee, Subir
Elimelech, Menachem
Kretzschmar, Ruben
description The transport and deposition dynamics of hematite (α-Fe2O3) colloids in packed quartz sand media are investigated. Column transport experiments were carried out at various solution ionic strengths, colloid concentrations, and flow velocities. A colloid transport model was proposed that includes the dynamics of blocking as well as multilayer deposition that takes place at high ionic strengths where particle–particle interactions are favorable. Blocking dynamics in the model are described by either Langmuirian adsorption (LA) or random sequential adsorption (RSA). Two important model parameters—the particle–matrix collision efficiency and the ionic strength dependent blocking (excluded area) parameter—are estimated from the colloid breakthrough curves using a nonlinear optimization procedure. The collision (attachment) efficiency for particle–particle interactions, on the other hand, was determined independently from colloid aggregation rate measurements. At very low ionic strength, only monolayer deposition is observed and the RSA model gives a better description of the experimental data than the LA model. At higher ionic strengths, multilayer deposition becomes significant and both models yield comparable results. Calculated maximum surface coverages at low ionic strengths were in good agreement with experimentally observed values obtained by scanning electron microscopy.
doi_str_mv 10.1006/jcis.2000.7097
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subjects blocking effect
Chemistry
colloid transport
Colloidal state and disperse state
deposition dynamics
Exact sciences and technology
General and physical chemistry
hematite
kinetics
Physical and chemical studies. Granulometry. Electrokinetic phenomena
title Transport of Iron Oxide Colloids in Packed Quartz Sand Media: Monolayer and Multilayer Deposition
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