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Durham University

Department of Engineering

Staff Profile

Publication details for Professor Jun Jie Wu

Liu, S., Fang, F., Wu, J.J. & Zhang, K. (2015). The anti-biofouling properties of thin-film composite nanofiltration membranes grafted with biogenic silver nanoparticles. Desalination 375: 121-128.

Author(s) from Durham

Abstract

Biofouling is still one of the most challenging issues of nanofiltration. One of the practical strategies to reduce biofouling is to develop novel anti-biofouling membranes. Herein, biogenic silver nanoparticles (BioAg0-6) with the averaged diameter of only 6 nm were firstly grafted on the surface of polyamide NF membrane. The effect of grafted BioAg0-6 on the performance of thin-film composite (TFC) NF membranes was systematically investigated with a comparison to the grafted chemical AgNPs. BioAg0-6 grafted membrane (TFC-S-BioAg) increased the hydrophilicity of the TFC membrane and water permeability, while maintaining the relatively high salt rejection. The result of silver leaching experiment indicated that the grafted BioAg0-6 had a better stability on the membranes, the ratio of remained silver in the TFC-S-BioAg membrane was 95%, after soaked in pure water for 50 days. After 4 month immersion, the rejection of TFC-S-BioAg membrane remained more than 90% of initial rejection. The results of disk diffusion test revealed that both of TFC-S-BioAg membrane and TFC-S-ChemAg membrane showed effective anti-bacterial ability to inhibit Pseudomonas aeruginosa and Escherichia coli growth, the TFC-S-BioAg membrane showed more excellent and longer lasting antibacterial property. Therefore, BioAg0-6 grafted TFC membranes could be potential as an effective strategy to decrease biofouling in nanofiltration process.