Effect of Membrane Surface Roughness on Colloid−Membrane DLVO Interactions

Hoek, Eric M.V.; Bhattacharjee, Subir; Elimelech, Menachem

doi:10.1021/la027083c

Cited by 449 publications

(354 citation statements)

References 23 publications

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“…When particle-membrane interaction (colloidal deposition) is involved, the DLVO theory has been often cited for theoretical explanation [71][72][73][74]. The DLVO theory states that the affinity between a particle and a surface is primarily determined by the electrical double layer (EDL) interaction and the van der Waals (vdW) interaction.…”

Section: Mechanism Of Electrostatic Interactionmentioning

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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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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Section: Mechanism Of Electrostatic Interactionmentioning

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

View full text Add to dashboard Cite

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“…Due to the roughness of NF and RO membranes, the colloids are located mainly in the valleys on the surface after filtration; i.e. "valley clogging" has taken place ( [19,21]. Nevertheless, the colloids are distributed over the entire membrane surface and formed a dense and uniform cake layer on the membrane surface due to hydrophobic interactions between the foulants and membrane surfaces ( [22,23].…”

Section: Sem-eds and Afm Analysismentioning

confidence: 99%

Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration

Altalyan

Jones

Bradd

et al. 2016

Journal of Water Process Engineering

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. (2016). Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration. Journal of Water Process Engineering, 9 9-21. Removal of volatile organic compounds (VOCs) from groundwater by reverse osmosis and nanofiltration AbstractA comprehensive study was conducted to examine the removal of volatile organic compounds (VOCs) which exist in groundwater at Southlands-Botany Bay (Sydney region). The ability of nanofiltration (NF) and reverse osmosis (RO) as advanced treatments was investigated using two commercially available NF or RO membranes. Laboratory-scale tests were used with cross-flow; tests were conducted with 16 ubiquitous compounds that represented the significant volatile organic compounds found in the contaminated groundwater. The results reported in this study indicate that the removal efficiency of reverse osmosis (RO) was better than NF in rejecting the VOCs detected in groundwater. This study revealed that the performance of NF and RO membranes in rejecting hydrophilic volatile organic compounds was higher than that for hydrophobic compounds and the highest rejection achieved by NF and RO membranes amounted 98.4% and 100%, respectively. Hydrophilic compounds can be effectively rejected by NF/RO membranes using the size exclusion mechanism (steric hindrance), whereas hydrophobic compounds can be adsorbed into NF/RO membranes and then diffuse through the dense polymeric matrix, resulting in the lower removal for these compounds compared to hydrophilic compounds. Keywords:Volatile organic compounds (VOCs) Reverse osmosis (RO) Nanofiltration (NF) Botany Bay ABSTRACT A comprehensive study was conducted to examine the removal of volatile organic compounds (VOCs) which exist in groundwater at Southlands-Botany Bay (Sydney region).The ability of nanofiltration (NF) and reverse osmosis (RO) as advanced treatments was investigated using two commercially available NF or RO membranes. Laboratory-scale tests were used with cross-flow; tests were conducted with 16 ubiquitous compounds that represented the significant volatile organic compounds found in the contaminated groundwater.The results reported in this study indicate that the removal efficiency of reverse osmosis (RO) was better than NF in rejecting the VOCs detected in groundwater. This study revealed that the performance of NF and RO membranes in rejecting hydrophilic volatile organic compounds was higher than that for hydrophobic compounds and the highest rejection achieved by NF and RO membranes amounted 98.4 % and 100 %, respectively. Hydrophilic compounds can be effectively rejected by NF/RO membranes using the size exclusion mechanism (steric hindrance), whereas hydrophobic compounds can be adsorbed into NF/RO membranes and then diffuse through the dense polymeric matrix, resulting in the lower removal for these compounds compared to hydrophilic compounds.

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“…Cake-enhanced CP Hoek and Elimelech [63] made a conceptual analysis of the solute transport and CP phenomena in cross-flow membrane filtration. They showed if the CP layer was thick relative to the cross-flow channel height, mass transfer may be affected through both hindered diffusivity of salt ions and altered tangential shear due to hydrodynamic drag caused by the stationary particles in the fluid.…”

Section: Cake-enhanced Concentration Polarizationmentioning

confidence: 99%