Water purification using functionalized cellulose with non-leaching bacteria adsorbing properties
(English)Manuscript (preprint) (Other academic)
Portable purification systems are easy ways to obtain clean drinking water when there is no large-scale water treatment available. In this study, the potential to purify water using bacteria adsorbing cellulose functionalized with polyelectrolytes, according to the Layer-by-Layer method, is investigated. The adsorbed polyelectrolytes create a positive charge on the cellulose surface that physically attracts and bonds with bacteria. Three types of cellulose material have been modified and tested for the bacterial removal capacity in water. The time, material-water ratio and bacterial concentration dependence, as well as the bacterial removal capacity in water from natural sources, have been evaluated. Freely dispersed bacteria adsorbing cellulose can remove greater than 99.9% of Escherichia coli from non-turbid water, with the most notable reduction occurring within the first hour. For turbid water, a filtering approach using modified cellulose fibers is desirable. This bacteria adsorbing cellulose does not leach any biocides, and it is an environmentally sustainable and cheap option for disposable water purification devices.
Contact-active material, emergency treatment, polyelectrolyte multilayer
Paper, Pulp and Fiber Technology
Research subject Chemistry
IdentifiersURN: urn:nbn:se:kth:diva-204508OAI: oai:DiVA.org:kth-204508DiVA: diva2:1085022
QC 201703282017-03-272017-03-272017-03-28Bibliographically approved