Polymer-Capped Nanoparticle Transport in Granular Media Filtration: Deviation from the Colloidal Filtration Model
Publication: Journal of Environmental Engineering
Volume 143, Issue 7
Abstract
The single-collector removal efficiency based on the colloidal filtration model is widely used to quantify deposition of nanoparticles in porous media filtration. The validity of this theory for nanoparticles, especially at filtration rates used in water treatment, was evaluated. Granular media filtration experiments were performed under widely variant physical conditions. Chemical effects were minimized by selecting spherical branched polyethylenimine-capped silver nanoparticles as a positively charged nanoparticle to avoid electrostatic repulsion with the negatively charged silica filter media. The model and experimental results agreed well for 50- and 100-nm particles, but 10-nm particles were removed to a lesser extent than the model predicted. An updated Derjaguin–Landau–Verwey–Overbeek calculation was performed for the interaction energy between polymer-capped nanoparticles and the collector surface, under constant potential, constant charge, and mixed assumptions. The effect of particle size on these calculations was dramatic, leading to far less attractive energy for the smallest particles in the mixed case, and even repulsion in the constant charge case. These revised calculations are the primary means to explain the unexpected data.
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Acknowledgments
This research was provided by the U.S. National Science Foundation (CBET-1336139).
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Published In
Journal of Environmental Engineering
Volume 143 • Issue 7 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 14, 2016
Accepted: Dec 27, 2016
Published online: Mar 31, 2017
Published in print: Jul 1, 2017
Discussion open until: Aug 31, 2017
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