Surface modification of reverse osmosis membranes with zwitterionic coating for improved resistance to fouling

Shafi, Hafi zZ ahid; Khan, Zulfiqar Ahmad; Yang, Rong; Gleason, Karen K.

doi:10.1016/j.desal.2015.02.009

Cited by 120 publications

(44 citation statements)

References 44 publications

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“…The adhesion of bacteria tends to build up a persistent biofilm over the membrane surface during long‐term operation . This phenomenon may contribute to severe reduction of flux and throughput of the membrane .…”

Section: Resultsmentioning

confidence: 99%

Robust self cleaning polypyrrole‐polysulfone blend hollow fiber membrane for biofouling mitigation

Mukherjee

2018

J of Chemical Tech & Biotech

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BACKGROUND Persistent biofouling of membrane is the most commonly encountered problem during separation diminishing the throughput of the system. Many techniques have been adopted to mitigate biofouling. This paper describes the fabrication of polysulfone and polypyrrole blend hollow fiber membrane with outstanding self‐cleaning potential. Blending of polypyrrole promoted excellent anti‐biofouling surface against Gram positive and Gram negative bacteria. The impact of flow rate and pressure on membrane performance was also evaluated during the separation process. RESULTS Loading of polypyrrole resulted in enhanced hydrophilicity, permeability, zeta potential and tensile strength. Scanning electron microscopy confirmed the appearance of macrovoids with increase of polypyrrole concentration, indicating the porous structure of the membrane. Hollow fibers exhibited negative potential at pH 7, leading to excellent anti‐biofouling surface. Roughness of fibers was dramatically reduced from 120 to 3 nm with polypyrrole concentration imparting superior self cleaning surface on the membrane. Fluorescence microscopy analyses revealed significant reduction in bacteria adhesion on 1 wt% polypyrrole loaded fibers. Modified membrane showed striking antibacterial property due to the leakage of cytoplasmic materials through lysis, as supported by A260 nm absorption study. Morphological analysis of the used blend membrane showed almost no deposition of bacteria even after a long run, holding the promise of biofouling mitigation. CONCLUSION Modification of membrane by polypyrrole imparted an outstanding self‐cleaning property to the hollow fiber; hence, it is a simple and scalable approach to prevent biofouling during long‐term performance. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Robust self cleaning polypyrrole‐polysulfone blend hollow fiber membrane for biofouling mitigation

Mukherjee

2018

J of Chemical Tech & Biotech

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“…Contact angle measurement is a well-established method for measuring the hydrophilicity of surface [22]. As shown in Table 1, the contact angle of water on the fouled membrane was the highest (53.9˚) and decreased to 46.2˚and 42.4˚after cleaning with Step A and Step B, respectively, which was approached to that of virgin membrane (41.0˚).…”

Section: Effect Of Membrane Cleaning On Membrane Surface Propertiesmentioning

confidence: 97%

“…The hydrophilicity of membrane surface can be measured by water contact angle, and more sophisticatedly, by the calculation of surface free energy [22]. For quantifying the surface free energy between foulants and membrane surface, DerjaguinLandau-Verwey-Overbeek (DLVO) theory has been frequently used as the sum of Lifshitz-van der Waals (LW) and electrostatic (EL) interactions in water.…”

Section: Introductionmentioning

confidence: 99%

Relating membrane surface properties and flux recovery during the chemical cleaning of forward osmosis membrane

Ruengruehan

Fagkaew

Ahn

et al. 2016

Desalination and Water Treatment

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In this study, we evaluated the efficiencies of chemical cleaning agents for the removal of foulant and related the changes of membrane surface properties to the flux recovery in forward osmosis (FO) membrane process. Commercially available chemical cleaning agents were added and processed according to the protocols of reverse osmosis (RO) membrane processes into two steps-acid treatment, then base treatment, and the flux recovery and membrane surface properties were tested in FO mode. The flux of the fouled membrane was only 23% of initial water flux tested in FO mode, and the addition of cleaning chemicals could improve the water flux to be 65 and 83% of initial water flux after each step, respectively. The reverse flux selectivity of fouled membrane was increased up to 61 and 86% after each cleaning steps due to the decrease in the concentration polarization inside the layer. The removal of biofouling layer during each cleaning step was demonstrated by scanning electron microscopy (SEM) and FT-IR, while incomplete removal of colloidal matters on membrane surfaces was observed. The total membrane surface free energy was increased after the cleaning steps due to the increase in electron-donating and electron-accepting character. Overall, chemical cleaning agents designed for RO could remove various membrane foulants as well as recover the hydrophilicity of membrane surfaces and consequently be applied for the cleaning of membranes operated in FO process, but additional cleaning protocol should be developed for the removal of colloidal matters from membrane surfaces.

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“…Example of some polymers and nanomaterials used recently for anti‐biofouling research . MPC, 2‐methacryloyloxyethyl phosphorylcholine; ADMH‐MBA, 3‐allyl‐5,5‐dimethylhydantoin (ADMH) crosslinked by N,N′‐Methylenebis(acrylamide) (MBA); CPPC, Cationic phosphorylcholine polymer; PDA‐g‐PMTAC, Poly [2‐(methacryoyloxy) ethyl]trimethylammonium chloride; Z – PCBAA, Zwitterionic structures containing polycarboxybetaine acrylic acetate (PCBAA); HEMA‐PFDA, Hydrophilic hydroxyethyl methacrylate (HEMA) and the hydrophobic perfluoro decylacrylate (PFDA); GO*, Graphene oxide layer in both polyamide active and polysulfone support layer; GO, Graphene oxide embedded TFC membrane.…”

Section: Responsesmentioning

confidence: 99%

Use of DPSIR Framework to Analyze Water Resources in Qatar and Overview of Reverse Osmosis as an Environment Friendly Technology

Ashfaq

Qiblawey

Zouari

et al. 2018

Env Prog and Sustain Energy

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Qatar and other countries of Gulf Cooperation Council are among the most water scarce countries in the world and are being characterized as “high‐water risk” countries by Water Resource Institute. Therefore, it is important to implement sustainable water resource management that encompass economic, societal, and environmental aspects. In this review article, the Driver‐Pressure‐State‐Impact‐Response framework was used to analyze the water resource system in Qatar in terms of drivers, pressures, change in state, impacts, and responses. It was noted that both economic and population growth together with unsustainable water consumption are major driving forces that are pressurizing the Qatar's water resources (desalinated seawater and renewable groundwater). Currently, desalination plants using Multi‐Stage Flash (MSF) techniques are predominantly being used to meet the rising water demands. However, widespread use of MSF techniques poses several environmental and economic impacts. Therefore, in addition to other management and corrective measures, reverse osmosis (RO) technique has also been suggested to be utilized in desalination industry as a “response” to mitigate those impacts. Since, the performance of RO is mainly affected by biofouling and mineral scaling, the paper also highlights the recent materials (polymers and nano‐materials) used to tackle these problems. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13081, 2019

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Surface modification of reverse osmosis membranes with zwitterionic coating for improved resistance to fouling

Cited by 120 publications

References 44 publications

Robust self cleaning polypyrrole‐polysulfone blend hollow fiber membrane for biofouling mitigation

Robust self cleaning polypyrrole‐polysulfone blend hollow fiber membrane for biofouling mitigation

Relating membrane surface properties and flux recovery during the chemical cleaning of forward osmosis membrane

Use of DPSIR Framework to Analyze Water Resources in Qatar and Overview of Reverse Osmosis as an Environment Friendly Technology

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