Modeling colloid deposition on a protein layer adsorbed to iron-oxide-coated sand

Autor(en)

Thilo Hofmann, Frank von der Kammer, Xinyao Yang, Ray Flynn

Abstrakt

Our recent study reported that conformation change of granule-associated Bovine Serum Albumin (BSA) may influence the role of the protein controlling colloid deposition in porous media (Flynn et al., 2012). The present study conceptualized the observed phenomena with an ellipsoid morphology model, describing BSA as an ellipsoid taking a side-on or end-on conformation on granular surface, and identified the following processes: (1) at low adsorbed concentrations, BSA exhibited a side-on conformation blocking colloid deposition; (2) at high adsorbed concentrations, BSA adapted to an end-on conformation promoted colloid deposition; and (3) colloid deposition on the BSA layer may progressively generate end-on molecules (sites) by conformation change of side-on BSA, resulting in sustained increasing deposition rates. Generally, the protein layer lowered colloid attenuation by the porous medium, suggesting the overall effect of BSA was inhibitory at the experimental time scale. A mathematical model was developed to interpret the ripening curves. Modeling analysis identified the site generation efficiency of colloid as a control on the ripening rate (declining rate in colloid concentrations), and this efficiency was higher for BSA adsorbed from a more dilute BSA solution.

Organisation(en)

Externe Organisation(en)

Sichuan Agricultural University, Queen's University Belfast

Journal

Journal of Contaminant Hydrology

Band

142-143

Seiten

50-62

Anzahl der Seiten

13

ISSN

0169-7722

DOI

https://doi.org/10.1016/j.jconhyd.2012.09.006

Publikationsdatum

2012

Peer-reviewed

Ja

ÖFOS 2012

105303 Hydrogeologie, 104023 Umweltchemie, 105105 Geochemie, 105904 Umweltforschung

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/c53d6bb9-04a5-4663-8594-8b8f623cc05f