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01.12.2015 | Original Paper | Ausgabe 6/2015

Cellulose 6/2015

Inhibition of bacterial adhesion on cellulose acetate membranes containing silver nanoparticles

Zeitschrift:
Cellulose > Ausgabe 6/2015
Autoren:
Patricia Fernanda Andrade, Andreia Fonseca de Faria, Fernando Júnior Quites, Silvana Ruella Oliveira, Oswaldo Luiz Alves, Marco Aurélio Zezzi Arruda, Maria do Carmo Gonçalves
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s10570-015-0752-6) contains supplementary material, which is available to authorized users.

Abstract

Membrane fouling is one of the major drawbacks that changes polymeric membrane performance. Biofouling has a series of effects, such as to reduce membrane permeability, to increase energy costs and to decrease membrane lifetime. Cellulose acetate (CA) membranes, containing different amounts of β-cyclodextrin stabilized silver nanoparticles (AgNP-β-CD), were prepared by dispersing the pre-synthesized nanoparticle (28 nm mean diameter) in CA casting solution. These membranes were obtained by phase-inversion process, in order to achieve both antibacterial properties and biofouling resistance. The typical crystal structure of the AgNP-β-CD, before and after being dispersed in CA membranes, was detected by X-ray diffraction. Field emission electron microscopy images showed membranes with finger-like morphology and atomic force microscopy images showed the presence of nanoparticles in the membrane top surface. The results indicated that the presence of AgNP-β-CD did not influence the membrane thermal degradation but increased the water flux through the membrane. The antibacterial activity of the membranes containing AgNP-β-CD (CA-Ag) was evaluated against E. coli and S. aureus using the plate count method. The results showed that almost 100 % of the E. coli and S. aureus viable cells were inhibited after 12 h of contact with CA-Ag membranes. In addition, the CA membranes were able to prevent more than 90 % E. coli biofilm formation. Based on the results, CA membranes prepared with AgNP-β-CD can be potentially applied as anti-biofouling filtration membranes for water treatment and wastewater recovery.

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Zusatzmaterial
Supplementary material 1 (DOC 7940 kb)
10570_2015_752_MOESM1_ESM.doc
Literatur
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