Characterization of polymeric nanofiltration membranes for systematic analysis of membrane performance

a b s t r a c tThe efforts of developing anti-oil-fouling membranes have so far been focusing on tailoring membrane surface wetting properties, whereas the impacts of surface charge are often eclipsed. In this study, we investigated the impacts of surface charge and wetting property on oil fouling kinetics in membrane distillation (MD). Two composite membranes with in-air hydrophilic and underwater oleophobic surfaces, one of positive charge and the other of negative charge, were fabricated by modifying a hydrophobic polyvinylidene fluoride (PVDF) membrane with hydrophilic polyelectrolytes with different charges. The modified composite membranes were compared with the reference PVDF membrane for their contact angles, adhesion force curves, and fouling kinetics in MD processes. It was found that the negatively charged composite membrane performed the best in mitigating fouling by the negatively charged oil emulsion, followed by the positively charged composite membrane, with the pristine PVDF membrane being the most susceptible to oil fouling in MD experiments. The results from underwater oil CA measurements and oil probe force spectroscopy corroborated the results in the fouling experiments. The impact of surface charges on oil-membrane interaction and associated mechanism were also discussed.

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“…2). The zeta potential varied with pH due to protonation or deprotonation of surface functional groups [61,62].…”

Section: Membrane Surface Potentialmentioning

confidence: 99%

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Wang

Jin

Hou

et al. 2016

Journal of Membrane Science

128

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“…When looking at AFM images of NF membranes the differences in roughness vary considerably depending on the scan size [84,85] and the area where the topography is measured. In some areas, the membrane is very smooth [86] but in others, membrane defects from the manufacturing process show deep ridges and valleys that could accommodate bacteria and protect them from cross-flow, as can be seen in Figure 5 for the NF 270 and the NF 90 membranes.…”

Section: Surface Morphology and Microtopographymentioning

confidence: 99%

The role of cell-surface interactions in bacterial initial adhesion and consequent biofilm formation on nanofiltration/reverse osmosis membranes

Habimana

Semiao

Casey

2014

Journal of Membrane Science

233

113

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“…NF90 and NF270) can differ up to 100% 9,13,14,16 . The presented data (atomic force microscopy -AFM) indicated that NF90 has the roughest top layer, while NF270 has the smoothest top layer 14 . The used membranes comprise different polyamide chemistries.…”

Section: Introductionmentioning

confidence: 87%

Evaluation of fouling potential of nanofiltration membranes based on the dynamic contact angle measurements

Gryta

Bastrzyk

Lech

2012

Polish Journal of Chemical Technology

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In this work the studies were performed on the intensity of fouling of the membrane NF90 and NF270 depending on the value of dynamic contact angle, previously determined for these membrane. The NF membranes were used for the separation of broth obtained during the fermentation of glycerol by Lactobacillus casei bacteria. The measurements of dynamic contact angle were carried out using the Wilhelmy plate method. Taped membranes samples (support layer to support layer), wetted for 2 days in deionized water prior to testing, were used to study the contact angle of top layer and its organic fouling. Using deionized water; the contact angle values equal to [27][28][29][30] o and 53-57 o for NF270 and NF90, respectively, were obtained. As a consequence of adsorption of organic compound on the membrane surfaces, the contact angle obtained for both fouled membranes was about 55-56 o , and this value was closer to the contact angle of non-fouled NF90 membrane. Therefore, the NF90 membrane was more resistant to organic fouling during the separation of broth.

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Characterization of polymeric nanofiltration membranes for systematic analysis of membrane performance

Cited by 176 publications

References 41 publications

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

The role of cell-surface interactions in bacterial initial adhesion and consequent biofilm formation on nanofiltration/reverse osmosis membranes

Evaluation of fouling potential of nanofiltration membranes based on the dynamic contact angle measurements

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