Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)
Ahn, Won-Young
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https://hdl.handle.net/2142/83369
Description
Title
Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)
Author(s)
Ahn, Won-Young
Issue Date
2008
Doctoral Committee Chair(s)
Clark, Mark M.
Department of Study
Civl and Environmental Engineering
Discipline
Civl and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Environmental Sciences
Language
eng
Abstract
"Hence, NOM aggregation was experimentally evaluated by dynamic light scattering measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM structures or aggregates. The MD simulations revealed two different mechanisms of NOM aggregation. Calcium ions connect NOM molecules by co-complexation, forming linearly-shaped NOM aggregates. On the other hand, simulation results with magnesium and sodium are more consistent with a ""salting-out"", wherein the ions may promote more compact and spherically-shaped NOM clusters."
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