Maximizing the grafting of zwitterions onto the surface of ultrafiltration membranes to improve antifouling properties

Shahkaramipour, Nima; Jafari, Amin; Tran, Thien; Stafford, Christopher M.; Cheng, Chong; Lin, Haiqing

doi:10.1016/j.memsci.2020.117909

Cited by 48 publications

(33 citation statements)

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“…This value is consistent with the reported value (47.7 ± 6.5°) from an experimental study. 41 In Figure 10, we observe that cos θ is positive for the three membranes over the entire temperature range explored here. This result indicates that the polymer membranes studied here are hydrophilic (θ < 90°).…”

Section: ■ Results and Discussionsupporting

confidence: 91%

“…Motivated by an earlier experimental study on antifouling ultrafiltration membranes, 41 we employ the coupled MC/MD simulation method to study the wetting behavior of water in the vicinity of several antifouling polymer membranes, including a base polysulfone (PSF) membrane, two PEGgrafted PSF membranes, and two zwitterionic polymer-grafted PSF membranes. Poly(ethylene glycol) acrylate (PEGA) and poly(ethylene glycol) methyl ether acrylate (PEGMEA) are selected as the two PEG-based polymer tethers.…”

Section: ■ Introductionmentioning

confidence: 99%

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Coupled Monte Carlo and Molecular Dynamics Simulations on Interfacial Properties of Antifouling Polymer Membranes

2021

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We use molecular simulation to study the wetting behavior of antifouling polymer-tethered membranes. We obtain the interfacial properties (e.g., contact angle) of water at various temperatures for five polymer membranes, including a base polysulfone (PSF) membrane and four other PSF membranes grafted with antifouling polymers (two poly(ethylene glycol) (PEG) tethers and two zwitterionic tethers). We implement a coupled Monte Carlo (MC)/molecular dynamics (MD) approach to determine the interface potentials of water on the membrane surfaces in an efficient manner. Within this method, short MC and MD simulations are performed in cycles to collect the surface excess free energy of a thin water film on polymer membrane surfaces. Simulation results show that the grafting of zwitterionic tethers provides a more significant enhancement in the hydrophilicity of the PSF membrane than that of the PEG tethers. Water completely wets the surface of zwitterionic polymer membranes.

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Section: ■ Results and Discussionsupporting

confidence: 91%

Section: ■ Introductionmentioning

confidence: 99%

Coupled Monte Carlo and Molecular Dynamics Simulations on Interfacial Properties of Antifouling Polymer Membranes

2021

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“…The flux recovery rate (FRR) and BSA rejection rate of the two HFM were also listed in Table 1. PSU-g-SBMA HFM had better performance in separation efficiency and anti-fouling effect, which was consistent with the previous reports that SBMA modified ultrafiltration membrane improved the anti-fouling to proteins (Chiao et al 2020;Shahkaramipour et al 2020).…”

Section: Resultssupporting

confidence: 92%

PSU-g-SBMA hollow fiber membrane for treatment of oily wastewater

Shen

Zhang

Meng

2021

Water Science and Technology

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Ultrafiltration membranes can intercept oil particles smaller than 10 μm, but the membranes are easy to be contaminated by oil due to their hydrophobicity. To treat various oily wastewater, we prepared a hydrophilic hollow fiber membrane (HFM) with anti-fouling property by grafting sulfobetaine methacrylate (SBMA) onto polysulfone (PSU). For six simulated wastewater containing emulsified oil at 1,000 mg/L, the PSU-g-SBMA HFM was able to remove 98.5–99.7% of oil, higher than that of PSU HFM at 91.1–98.9%. The oil concentration in filtrate was less than 15 mg/L, which could meet the discharge standard of wastewater. The water flux of PSU-g-SBMA HFM can be completely recovered after being washed by rhamnolipid and alkali solution, while the same cleaning process could not recover the PSU HFM. As found, the contact angles of oil droplets on the PSU-g-SBMA membrane were larger than those on PSU membrane, which indicated the improved hydrophilicity by PSU-g-SBMA. For 48 h of filtration to soybean and diesel oil/water emulsion, the effect of PSU-g-SBMA HFM was stable and the flux could be completely recovered by cleaning. Therefore, we provided a new method for oily wastewater treatment, which can efficiently and energy-saving remove various oil substances in wastewater.

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“…[110,111] The base concept was derived upon applying nano-branched structure compounds through membrane surface modification either by phase inversion, [112,113] grafting, [114] and coating. [115] Oil adsorbed inside membrane pores according to designed values to be minimum this is because oil droplets were mostly rejected due to the nature of oil-water-composite structure interface, especially underwater with super-oleophobic composites. These structures were stabilized mechanically due to covalent bonding in crosslinking between cellulose and polyvinyl alcohol (PVA).…”

Section: Current Challenges For Membrane Application With Oil/water Emulsionmentioning

confidence: 99%

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

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found with other insoluble matter, presenting relevant problems with safe and convenient separation. The legal discharge of oil-water emulsions is a complex process. [4] Thus, environmental authorities have established stringent regulations to cope with it. [5] Depending on countries, the oil limits are concentrations below 40 ppm as in Vietnam, [6] and in other countries like Korea, the maximum is only five ppm of oil in discharge. [7] Generally, the oil phase in water has three forms, based on oil droplets, size of more than 150 micrometers is called free oil, but that size found from 50 to 150 micrometers is the dispersed oil, [8] finally, the emulsified oil less than 20 µm. There is an increasing interest in employing membrane technology for filtering smaller size oil droplets. In this review, oil-water emulsion problems are highlighted with oil-water separation techniques selection and their performance with varied oil concentration and composition of other immiscible or miscible components. [9] Membrane technology is known formerly to economically advantageous for oily wastewater (OWW) treatment compared with other conventional technologies. [9] Based on the literature, the membranebased treatment cost estimation was about 1 and 3 $ m −3 , [10] lower than for dissolved air floatation (DAF) treatment (cost was 3.65 $ m −3 ). Generally, the treatment cost depends on OWW sources, as each industry has its specific blends for oil and grease jointly with other membrane foulants. [11] For example, oil-water emulsions treatment from the fatty acid industry has a total capital cost (costs of membranes, electricity, labor, cleaning, and maintenance) of 2.65 $ m −3 , compared with the railroad industry (it was ranged from 1.03 to 1.48 $ m −3 ). These costs for the metalworking OWW using UF were 2.8 $ m −3 . In microfiltration (MF) membrane, the OWW membrane-based treatment for oil concentration of 50 ppm annual cost was estimated as 0.098 $ m −3 with a feed rate of 100 m 3 day −1 . [9] The cost of membrane-based treatment of OWW is generally varying but is lower than conventional technologies. [12] 1.1. Oil-Water Emulsions Sources, Environmental Hazard, and Discharge Limits An oil-water emulsion is either a waste stream product, or secondary product. These effluents are generated from different areas and industrial sectors like the petroleum& gas sector, food processing, shipping facilities and maritime, and many others Oily wastewater is generated by various industries in extraordinary growing volumes, such as oil refineries, petrochemicals, metallurgical, food & beverages, and dairy industries, which need oil removal for safe discharge to the environment. Lower cost of production with high oil removal and efficient performance compared to classical methods for treating oil-water emulsions attributed to the alleviation of operation. That emphasizes membrane modification to enhance wettability, hydrophilicity with the antifouling property such as membranes dealing with tiny oil emulsions to be the key parameters to im...

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Maximizing the grafting of zwitterions onto the surface of ultrafiltration membranes to improve antifouling properties

Cited by 48 publications

References 50 publications

Coupled Monte Carlo and Molecular Dynamics Simulations on Interfacial Properties of Antifouling Polymer Membranes

Coupled Monte Carlo and Molecular Dynamics Simulations on Interfacial Properties of Antifouling Polymer Membranes

PSU-g-SBMA hollow fiber membrane for treatment of oily wastewater

Recent Aspects in Membrane Separation for Oil/Water Emulsion

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