Influence of natural organic matter on transport and retention of polymer coated silver nanoparticles in porous media.

Published

Journal Article

Interactions between organic matter (OM) and engineered polymer coatings as they affect the retention of polyvinylpyrrolidone (PVP) polymer-coated silver nanoparticles (AgNPs) were studied. Two distinct types of OM-cysteine representing low molecular weight multivalent functional groups, and Suwannee River Humic Acid (HA) representing high molecular weight polymers, were investigated with respect to their effects on particle stability in aggregation and deposition. Aggregation of the PVP coated AgNPs (PVP-AgNPs) was enhanced by cysteine addition at high ionic strengths, which was attributed to cysteine binding to the AgNPs and replacing the otherwise steric stabilizing agent PVP. In contrast the addition of HA did not increase aggregation rates and decreased PVP-AgNP deposition to the silica porous medium, consistent with enhanced electrosteric stabilization by the HA. Although cysteine also reduced deposition in the porous medium, the mechanisms of reduced deposition appear to be enhanced electric double layer (EDL) interaction at low ionic strengths. At higher ionic strengths, aggregation was favored leading to lower deposition due to smaller diffusion coefficients and single collector efficiencies despite the reduced EDL interactions.

Full Text

Duke Authors

Cited Authors

  • Yang, X; Lin, S; Wiesner, MR

Published Date

  • January 2014

Published In

Volume / Issue

  • 264 /

Start / End Page

  • 161 - 168

PubMed ID

  • 24295767

Pubmed Central ID

  • 24295767

Electronic International Standard Serial Number (EISSN)

  • 1873-3336

International Standard Serial Number (ISSN)

  • 0304-3894

Digital Object Identifier (DOI)

  • 10.1016/j.jhazmat.2013.11.025

Language

  • eng