Bacteria adsorbing emergency water filters based on polyelectrolyte modified paper
(English)Manuscript (preprint) (Other academic)
Water filtration is a popular way to remove particles and microorganisms from drinking water but is generally based on size exclusion of the particles. Bacteria can be modeled as small particles with a diameter of 1-2 µm, which is usually too small to be excluded by paper filters. In this article, commercial available paper filters have been surface modified by polyelectrolyte multilayer adsorption to create a positively charged filter that can trap the negatively charged bacteria through electrostatic interactions. The polyelectrolyte modified filters bind the bacteria to there surface and will thereby remove bacteria from the water instead of inactivated them through addition of biocides. The modified filters can remove more than 99.9 % of bacteria in water, depending on filter design, and has successfully been compared to a commercial cellulose water filter, based on the release of silver to inactivate bacteria. This cheap and easy modification of filter paper has potential to create disposable water purification filters that could be used in emergency situations to prevent outbreak of lethal diarrheal diseases.
Cellulose, disposable, Point-of-Use, water purification
Paper, Pulp and Fiber Technology
Research subject Chemistry
IdentifiersURN: urn:nbn:se:kth:diva-204509OAI: oai:DiVA.org:kth-204509DiVA: diva2:1085026
QC 201703282017-03-272017-03-272017-03-28Bibliographically approved