Preparation of reverse osmosis membrane with high permselectivity and anti-biofouling properties for desalination

Highlights

• Nanoparticle incorporation and anti-biofouling grafting were integrated.

• Flux of modified membranes was enhanced without rejection sacrificing.

• Anti-biofouling property of modified membranes was improved.

Abstract

High performance is essential for the polyamide (PA) reverse osmosis (RO) membranes during the desalination process. Herein, RO membranes with high permselectivity and anti-biofouling properties were fabricated by nanoparticles incorporation and anti-biofouling grafting. Hydrotalcite (HT) incorporation was performed with a dual role, enhancing water flux and acting as grafting sites. The HT incorporation increased the water flux without sacrificing the salt rejection, compensating for the loss caused by the following grafting reaction. The exposed surface of HT acted as grafting sites for anti-biofouling agent dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (DMOTPAC). The combination of HT incorporation and DMOTPAC grafting endowed RO membranes with high permselectivity and anti-biofouling properties. The water flux of the modified membrane PA-HT-0.06 was 49.8 L/m²·h, which was 16.4% higher than that of the pristine membrane. The salt rejection of PA-HT-0.06 was 99.1%, which was comparable to that of the pristine membrane. As to the fouling of negatively charged lysozyme, the modified membrane’s water flux recovery was superior to that of the pristine membrane (e.g. 86.8% of PA-HT-0.06 compared to 78.2% of PA-pristine). The sterilization rates of PA-HT-0.06 for E. coli and B. subtilis were 97.3% and 98.7%, much higher than those of the pristine membrane (24.0% for E. coli and 26.7% for B. subtilis).

Graphical abstract

Keywords

Anti-biofouling grafting / Nanoparticle incorporation / Sterilization rates / Water flux / Water flux recovery

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Acknowledgements

This research was supported by the National Key Research and Development Program of China (Nos. 2018YFC0408002 and 2018YFE0196000), the Key Research Project of Shandong Province (China) (No. 2019JZZY010806), Shandong Provincial Natural Science Foundation (China) (ZR2020MB118), National Natural Science Foundation of China (Grant No. 21908257), the special Fund for Basic Scientific Research Business of Central Public Research Institutes (China) (Nos. K-JBYWF-2018-CR06, K-JBYWF-2018-HZ01) and the Natural Science Foundation of Tianjin (China) (No. 20JCZDJC00460).

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