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Issue 26, 2018, Issue in Progress
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Modification of a hollow-fibre polyethersulfone membrane using silver nanoparticles formed in situ for biofouling prevention

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Abstract

Biofouling represents a serious problem limiting the widespread application of membrane technology. Therefore, the aim of this study was to develop and verify a new modification method based on the in situ formation of silver nanoparticles and their incorporation into a membrane polymer to prevent biofouling. The modification method consisted of soaking a commercial hollow-fibre polyethersulfone membrane in a solution of silver ions, diffusion of ions into the membrane polymer, and their reduction using ascorbic acid. Such a modified membrane displayed a lower tendency towards biofouling, exhibiting an about 15% higher permeability compared to an unmodified membrane when filtering actual wastewater treatment plant effluent. The modification also led to the formation of stable silver nanoparticles (mostly in the range of 25–50 nm) homogenously distributed on the surface of the hollow-fibres. This resulted in higher surface hydrophilicity (the water contact angle decreased from 91° to 86°) contributing to the biofouling prevention. The modified membrane also showed high stability, as only 2.1% of the total silver leached after 8 h of filtration. Moreover, no changes in the original membrane cross-section structure or separation properties were observed. Besides the improved antibiofouling properties of the modified membrane, the main advantage of the developed method is its simplicity, short reaction time, absence of high energy-consuming initiation, and the possibility to apply it on site, thus even with commercial membrane modules. It will increase the application potential of membranes in the field of wastewater treatment.

Graphical abstract: Modification of a hollow-fibre polyethersulfone membrane using silver nanoparticles formed in situ for biofouling prevention

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Article information


Submitted
07 Mar 2018
Accepted
04 Apr 2018
First published
18 Apr 2018

This article is Open Access

RSC Adv., 2018,8, 14552-14560
Article type
Paper

Modification of a hollow-fibre polyethersulfone membrane using silver nanoparticles formed in situ for biofouling prevention

J. Dolina, Z. Gončuková, M. Bobák and L. Dvořák, RSC Adv., 2018, 8, 14552
DOI: 10.1039/C8RA02026D

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    [Original citation] - Published by The Royal Society of Chemistry.

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