title: Competitive Coadsorption Dynamics of Viruses and Dissolved Organic Matter to Positively Charged Sorbent Surfaces.
abstract: Adsorption onto solid-water interfaces is a key process governing the fate and transport of waterborne viruses. Although negatively charged viruses are known to extensively adsorb onto positively charged adsorbent surfaces, virus adsorption in such systems in the presence of negatively charged dissolved organic matter (DOM) as coadsorbate remains poorly studied and understood. This work provides a systematic assessment of the adsorption dynamics of negatively charged viruses (i.e., bacteriophages MS2, fr, GA, and Qβ) and polystyrene nanospheres onto a positively charged model sorbent surface in the presence of varying DOM concentrations. In all systems studied, DOM competitively suppressed the adsorption of the viruses and nanospheres onto the model surface. Electrostatic repulsion of the highly negatively charged MS2, fr, and the nanospheres impaired their adsorption onto DOM adlayers that formed during the coadsorption process. In contrast, the effect of competition on overall adsorption was attenuated for less-negatively charged GA and Qβ because these viruses also adsorbed onto DOM adlayer surfaces. Competition in MS2-DOM coadsorbate systems were accurately described by a random sequential adsorption model that explicitly accounts for the unfolding of adsorbed DOM. Consistent findings for viruses and nanospheres suggest that the coadsorbate effects described herein generally apply to systems containing negatively charged nanoparticles and DOM.
authors.affiliation: Institute of Biogeochemistry and Pollutant Dynamics (IBP), Department of Environmental Systems Science, ETH Zurich , 8092 Zurich, Switzerland.|Laboratory of Environmental Chemistry, School of Architecture, Civil, and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL) , CH 1015 Lausanne, Switzerland.
authors.forename: Antonius
authors.initials: A
authors.lastname: Armanious
authors.affiliation: Institute of Biogeochemistry and Pollutant Dynamics (IBP), Department of Environmental Systems Science, ETH Zurich , 8092 Zurich, Switzerland.
authors.forename: Melanie
authors.initials: M
authors.lastname: Münch
authors.affiliation: Laboratory of Environmental Chemistry, School of Architecture, Civil, and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL) , CH 1015 Lausanne, Switzerland.
authors.forename: Tamar
authors.initials: T
authors.lastname: Kohn
authors.affiliation: Institute of Biogeochemistry and Pollutant Dynamics (IBP), Department of Environmental Systems Science, ETH Zurich , 8092 Zurich, Switzerland.
authors.forename: Michael
authors.initials: M
authors.lastname: Sander
mesh_terms: D000327:Adsorption; D006812:Humic Substances / Q000032:analysis; D017909:Levivirus / Q000302:isolation & purification*; D054118:Nanospheres; D009930:Organic Chemicals / Q000302:isolation & purification*; D011137:Polystyrenes / Q000737:chemistry; D012995:Solubility; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D006812:Humic Substances; D009930:Organic Chemicals; D011137:Polystyrenes