Surface functionalization of reverse osmosis membranes with sulfonic groups for simultaneous mitigation of silica scaling and organic fouling

Guan, Yan-Fang; Boo, Chanhee; Lu, Xinglin; Zhou, Xuechen; Yu, Han‐Qing; Elimelech, Menachem

doi:10.1016/j.watres.2020.116203

Cited by 57 publications

(33 citation statements)

References 64 publications

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“…As shown in Table , there were several examples of RO membranes reported with anti-scaling and anti-fouling properties. ,,, After scaling and fouling experiments, the initial flux, ion concentrations, and pH of the feed had close relationship with the flux decline rates of the membrane. When operating with a higher initial flux, there was a more obvious downward trend in flux after fouling and scaling.…”

Section: Resultsmentioning

confidence: 99%

“…Several possible mechanisms were proposed to explain the dependence of scaling and fouling on the surface properties, containing surface charge, surface hydrophilicity, smoothness, and chemical groups. − ,, In generally, the increase in surface hydrophilicity contributes to form a hydrated layer, which may reduce the interaction between contaminants and the membrane surface . The reduction in surface roughness would reduce the attachment sites of contaminants on the membrane surface .…”

Section: Resultsmentioning

confidence: 99%

“…The introduction of DABS in aqueous solution provides additional sulfonic groups in the case of carboxylic groups remaining unchanged. In addition, we simulated the complete deprotonation of sulfonic groups and carboxylic groups, but sulfonic groups (p K a ≈ −0.7) might be more deprotonated than carboxylic groups, which makes the repulsion effect of sulfonic groups with silicate more obvious . The strong negative charge of the PA-DABS membrane surface resulted in a high electrostatic repulsion to both ionized silicic acid and BSA molecules (isoelectric point 4.7), which was the primary mechanism for the improved scaling and fouling resistance.…”

Section: Resultsmentioning

confidence: 99%

“…These previous studies proved that surface chemistry and engineering could effectively alter the membrane separation performance including its scaling or fouling resistance. However, in a practical desalination process, scaling and fouling usually exist simultaneously and deposite onto the membrane surface. − Therefore, recent research aimed at improving anti-scaling and anti-fouling properties of a TFC-RO membrane through modification. − The membrane with a more negative charge was prepared through grafting acrylic acid (AA) onto a commercial TFC-RO membrane through a redox free-radical method . The combined silica–organic fouling experiment indicated that the AA-modified membrane tended to restrict scalants and foulants from adsorption and deterioration on the membrane surface, mainly resulting from the electrostatic interaction mechanism .…”

Section: Introductionmentioning

confidence: 99%

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Sulfonated Reverse Osmosis Membrane Fabricated with Comonomer Having Excellent Scaling and Fouling Resistance

Mankol

Zhan

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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Silica scalant and organic foulant are rapidly deposited onto the surface of a thin-film composite (TFC) reverse osmosis (RO) membrane during the desalination process. The scaling and fouling propensity of the membranes are affected by the properties of the membrane surface. In this work, a sulfonated TFC-RO membrane was prepared with a comonomer of 2,5diaminobenzenesulfonic acid (DABS) and m-phenylenediamine (MPD) through an interfacial polymerization process to promote the scaling and fouling resistance. Detailed characterization was carried out to analyze the structure and surface morphology of the fabricated TFC-RO membranes. Compared to the nascent PA TFC-RO membrane, PA-DABS membranes exhibited a smoother, negatively charged, and more hydrophilic surface and showed significantly lower flux decline in both silica scaling and combined scaling−fouling experiments. Moreover, gradient isosurfaces for the interaction indicated a sulfonic group having stronger repulsion with silicic acid than the carboxyl group. Therefore, this work provides new understanding of a simple and efficient design of RO membranes that can be used for desalination of combined mineral-silica and organic-fouling laden water.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sulfonated Reverse Osmosis Membrane Fabricated with Comonomer Having Excellent Scaling and Fouling Resistance

Mankol

Zhan

Zhao

et al. 2021

Ind. Eng. Chem. Res.

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show abstract

“…Moreover, using low bulk concentrations of monomers and initiators is economical and beneficial for avoiding the environmental burden caused by the discharged of residual concentration. SPM with strong negatively charged sulfonic groups could enhance the electrostatic repulsion effect to pollutants and simultaneously mitigate fouling [13,18]. On the other hand, HEMA with many hydroxyl and hydrogen groups could improve the membrane surface hydrophilicity and enhance the rejection mechanism of steric hindrance [13].…”

Section: Introductionmentioning

confidence: 99%

Mitigating Silica Fouling and Improving PPCP Removal by Modified NF90 Using In Situ Radical Graft Polymerization

Lin¹,

Zheng²,

Gan³

et al. 2021

Membranes

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This study in-situ modified a commercial nanofiltration membrane, NF90, through the concentration-polymerization-enhanced radical graft polarization method by applying two agents of 3-sulfopropyl methacrylate potassium salt (SPM) and 2-hydroxyethyl methacrylate (HEMA) with different dosages. Surface characterization revealed that the modified membranes became rougher and more hydrophilic compared with the pristine membrane. The modified membranes exhibited considerably enhanced separation performance with 5.8–19.6% higher NaCl rejection and 17.2–19.9% higher pharmaceuticals and personal care products (PPCPs) rejection than the pristine membrane. When treating the feedwater with high silica concentration, the modified membranes exhibited relatively less flux decline with high percentage of reversible fouling, especially the ones modified using a lower monomer concentration (0.01 M SPM and 0.01 M HEMA). Moreover, membrane modification enhanced the PPCP rejection (1.3–5.4%) after silica fouling by mitigating foulant deposition on the membrane surface. The fouling mechanism was confirmed to be intermediate blocking of membrane pores. Therefore, the in-situ modification technique with a low monomer concentration proved to be effective for mitigating silica fouling and improving PPCP rejection, which can be easily performed and cost-effective in practical application.

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Anti‐Polyelectrolyte Effect of Zwitterionic Hydrogel Electrolytes Enabling High‐Voltage Zinc‐Ion Hybrid Capacitors

Zeng,

Chen,

Dong

et al. 2024

Adv Funct Materials

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To date, the exploration of zwitterionic application is confined to the function of electrolyte's additives to improve the properties of the electrolytes. However, reports on the unique properties of zwitterions, namely the anti‐polyelectrolyte effect (APE), as the regulators of the electrochemical stability windows (ESWs) of the zwitterionic electrolytes are scarce. Herein, a zwitterionic electrolyte system is designed and study the relationship between the APE and the ESWs of the zwitterionic electrolytes. The hydrogen/oxygen evolution in the zwitterionic electrolytes is significantly inhibited under the action of the APE. On this basis, the ESWs of zwitterionic electrolytes can be expanded, ultimately achieving an effective improvement in the energy density of zinc‐ion hybrid capacitors (ZHCs). The sulfonic‐based zwitterionic hydrogel electrolytes prepared based on this strategy achieve a wide ESW of 2.58 V and high ionic conductivity of 29.3 mS cm−1. Meanwhile, the corresponding ZHCs possess a high working voltage of 2.1 V (1.6 V for the traditional ZHCs), a high capacity of 188.9 mAh g−1 and a high energy density of 110 Wh kg−1. The way utilizing the APE of zwitterions to expand the ESWs opens up a new avenue to improve the energy density of energy storage devices.

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Surface functionalization of reverse osmosis membranes with sulfonic groups for simultaneous mitigation of silica scaling and organic fouling

Cited by 57 publications

References 64 publications

Sulfonated Reverse Osmosis Membrane Fabricated with Comonomer Having Excellent Scaling and Fouling Resistance

Sulfonated Reverse Osmosis Membrane Fabricated with Comonomer Having Excellent Scaling and Fouling Resistance

Mitigating Silica Fouling and Improving PPCP Removal by Modified NF90 Using In Situ Radical Graft Polymerization

Anti‐Polyelectrolyte Effect of Zwitterionic Hydrogel Electrolytes Enabling High‐Voltage Zinc‐Ion Hybrid Capacitors

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