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Tuesday, 17 September 2019
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Raw materials & technologies, Applications

Biofouling mitigation of bilayer polysulfone membrane

Tuesday, 26 March 2019

In a current work, polysulfone (PSf) membrane was modified using polyvinyl alcohol (PVA) layer and zinc oxide-polyrhodanine (ZnO-PRh) couple nanoparticles.

The ZnO-PRh couple nanoparticles as a new antibacterial agent were immobilised upon the surface using a dip coating method. Source: lunamarina – stock.adobe.com.
The ZnO-PRh couple nanoparticles as a new antibacterial agent were immobilised upon the surface using a dip coating method. Source: lunamarina – st...

Biofouling is known as a serious problem for membrane applications. There are several techniques to improve membrane biofouling resistance. The ZnO-PRh couple nanoparticles as a new antibacterial agent were immobilised upon the surface using a dip coating method. Also, the PVA layer was used in order to improve the hydrophilicity and binding of nanoparticles on the membrane surface. Fourier transform infrared (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle analysis were utilised for characterisation of the samples.

Increasing fouling resistance and antibacterial property

The effects of the ZnO-PRh nanoparticles and cross-linker concentration on the membrane performance were investigated. The highest flux of treated membranes was obtained for the combination of 5% and 0.75% for Glutaraldehyde (GA) and nanoparticle, respectively. It was observed that by adding ZnO-PRh/PVA to the membrane, surface hydrophilicity (from 111.8 to 59.0˚ of water contact angle), permeate flux (from 24.458 to 46.653 kg. m−2.  h-1 for the PVA and ZnO-PRh/PVA membranes, respectively), the rejection (from 81.521 to 97.52 and 83.77 to 98.97 for citrate and total phosphate samples), fouling resistance, and antibacterial property increased.

The study is published in: Progress in Organic Coatings Volume 129, April 2019, Pages 147-158.

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