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Colloidal transformations in ms2 virus particles: driven by ph, influenced by natural organic matter

  • Watts, Samuel Biointerfaces Lab, Empa, Swiss Federal Laboratories for Material Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
  • Julian, Timothy R. Eawag, Swiss Federal Institute of Aquatic Science, Überlandstrasse 133, 8600 Dübendorf, Switzerland - Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland - University of Basel, 4003 Basel, Switzerland
  • Maniura-Weber, Katharina Biointerfaces Lab, Empa, Swiss Federal Laboratories for Material Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
  • Graule, Thomas High Performance Ceramics Lab, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
  • Salentinig, Stefan Biointerfaces Lab, Empa, Swiss Federal Laboratories for Material Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland - Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland
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    25.02.2020
Published in:
  • ACS Nano. - 2020, vol. 14, no. 2, p. 1879–1887
English Enteric viruses, such as enterovirus, norovirus, and rotavirus, are among the leading causes of disease outbreaks due to contaminated drinking and recreational water. Viruses are difficult to remove from water through filtration based on physical size exclusion—for example by gravity-driven filters—due to their nanoscale size. To understand virus removal in drinking water treatment systems, the colloidal nanostructure of a model virus, the MS2 bacteriophage, has been investigated in relation to the effect of pH and natural organic matter in water. Dynamic light scattering, small-angle X-ray scattering, and cryogenic transmission electron microscopy demonstrated that the water pH has a major influence on the colloidal structure of the virus: The bacteriophage MS2’s structure in water in the range pH = 7.0 to 9.0 was found to be spherical with core–shell-type structure with a total diameter of 27 nm and a core radius of around 8 nm. Reversible transformations from 27 nm particles at pH = 7.0 to micrometer-sized aggregates at pH = 3.0 were observed. In addition, the presence of natural organic matter that simulates the organic components present in surface water was found to enhance repulsion between virus particles, reduce the size of aggregates, and promote disaggregation upon pH increase. These findings allow a better understanding of virus interactions in water and have implications for water treatment using filtration processes and coagulation. The results will further guide the comprehensive design of advanced virus filter materials.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308610
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