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Towards integrated anti-microbial capabilities: Novel bio-fouling resistant membranes by high velocity embedment of silver particles
journal contribution
posted on 2015-01-01, 00:00 authored by Ludovic Dumee, Li He, P C King, M L Moing, I Güller, M Duke, Peter HodgsonPeter Hodgson, S Gray, A J Poole, Lingxue KongLingxue KongBiofilm formation on membranes during water desalination operation and pre-treatments limits performance and causes premature membrane degradation. Here, we apply a novel surface modification technique to incorporate anti-microbial metal particles into the outer layer of four types of commercial polymeric membranes by cold spray. The particles are anchored on the membrane surface by partial embedment within the polymer matrix. Although clear differences in particle surface loadings and response to the cold spray were shown by SEM, the hybrid micro-filtration and ultra-filtration membranes were found to exhibit excellent anti-bacterial properties. Poly(sulfone) ultra-filtration membranes were used as for cross-flow filtration of Escherichia coli bacteria solutions to investigate the impact of the cold spray on the material[U+05F3]s integrity. The membranes were characterized by SEM-EDS, FT-IR and TGA and challenged in filtration tests. No bacteria passed through the membrane and filtrate water quality was good, indicating the membranes remained intact. No intact bacteria were found on hybrid membranes, loaded with up to 15. wt% silver, indicating the treatment was lysing bacteria on contact. However, permeation of the hybrid membranes was found to be reduced compared to control non-modified poly(sulfone) membranes due to the presence of the particles across the membrane material. The implementation of cold spray technology for the modification of commercial membrane products could lead to significant operational savings in the field of desalination and water pre-treatments.
History
Journal
Journal of membrane scienceVolume
475Pagination
552 - 561Publisher
ElsevierLocation
Amsterdam, The NetherlandsISSN
0376-7388eISSN
1873-3123Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2015, ElsevierUsage metrics
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No categories selectedKeywords
Anti-fouling surfaceAnti-microbial activityHybrid membranesParticle spray embedmentScience & TechnologyTechnologyPhysical SciencesEngineering, ChemicalPolymer ScienceEngineeringREVERSE-OSMOSIS MEMBRANESSPRAY METAL EMBEDMENTWASTE-WATER TREATMENTCOLD SPRAYULTRAFILTRATION MEMBRANEUF MEMBRANESRELEASENANOPARTICLESPERFORMANCEBIOREACTORS
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