Nafion-PTFE hollow fiber composite membranes for improvement of anti-fouling and anti-wetting properties in vacuum membrane distillation

Yu, Sha; Kang, Guodong; Zhu, Zhihao; Zhou, Meiqing; Yu, Haijun; Cao, Yijun

doi:10.1016/j.memsci.2020.118915

Cited by 26 publications

(17 citation statements)

References 48 publications

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“…Capillary PTFE membranes are mainly prepared using a cold-pressing method, including paste extrusion, stretching and sintering [ 6 , 7 , 8 , 9 ]. More specifically, this method is based on forcing a mixture of PTFE powder and paste lubricants through an extruder and forming a flexible capillary by using the paste extrusion process.…”

Section: Introductionmentioning

confidence: 99%

“…If the hydraulic pressure inside the MD module is lower than the LEP value, the distilled water does not wet the membranes [ 11 , 12 , 13 ], which was confirmed in three-year MD studies [ 12 ]. However, if hydrophilic groups form on the membrane’s surface as a result of polymer matrix degradation or the formation of deposits (fouling/scaling), the feed may flow into the pores that are in contact with them (surface wetting) [ 8 , 12 ]. This may initiate internal scaling, which causes wetting of the pores inside the wall; as a result, in some places, the wetted pores connect with each other, creating channels for feed leakage (partial wetting) [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Wettability Studies of Capillary PTFE Membranes Applied for Membrane Distillation

Woźniak

Gryta²

2023

Membranes

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In the present study, the membrane distillation (MD) process was studied with the use of commercial polytetrafluoroethylene (PTFE) capillary membranes. For this purpose, both solutions with NaCl concentrations up to 300 g/L and brines contaminated with oil (70–120 mg/L) were used as feeds. The membrane’s wetting resistance was tested by conducting long-term experiments for over 3500 h. Using detailed studies, it has been shown that increasing the salt concentration from 35 to 300 g/L resulted in a 50% reduction in the permeate flux. Nevertheless, the membranes retained 100% of the salt rejection after 2000 h of the module’s operation. Moreover, it has been found that performing the MD process with brines contaminated with oil (120 mg/L) led to the wetting of some membranes pores, which it turn resulted in an increase in the distillate’s conductivity to 450 µS/cm after 700 h running the process. The mechanism of pore wetting by oil droplets adsorbed on the membrane’s surface was presented. Finally, the proposed method of membrane cleaning with the use of a solvent allowed restoring the initial MD module’s performance. Consequently, both the permeate flux and distillate conductivity were stable during the MD of the feed containing 35 g/L of NaCl over the next 280 h.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wettability Studies of Capillary PTFE Membranes Applied for Membrane Distillation

Woźniak

Gryta²

2023

Membranes

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“…The membrane material is the main factor that determines the membrane performance. Currently, polymer materials, including cellulose and its derivatives [ 3 ], polysulfone [ 4 ], polyolefins, [ 5 ], and fluorinated materials [ 6 ] are most widely used in membrane separation. However, due to the inherent hydrophobic properties of these materials, they are easily contaminated during the ultrafiltration process.…”

Section: Introductionmentioning

confidence: 99%

“…In the context of global water resource shortages and increasingly serious environmental problems, membrane separation technology has attracted widespread attention. Using such technology, the molecular weight cut-off of ultrafiltration membranes can be controlled between 10 3 and 10 6 Da, and the pore size can be adjusted in the range of 10-100 nm [2], which can effectively intercept proteins, viruses, dyes, and other macromolecules. In the current global COVID-19 outbreak, the unique advantages of ultrafiltration membranes are further highlighted.…”

Section: Introductionmentioning

confidence: 99%

Novel dopamine-modified cellulose acetate ultrafiltration membranes with improved separation and antifouling performances

Wang

Guo

et al. 2022

J Mater Sci

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Cellulose acetate (CA) is widely used in the preparation of ultrafiltration membranes due to its many excellent characteristics, especially chemical activity and biodegradability. To improve the inherent hydrophobic and antifouling properties of CA membrane, in this work, CA was successfully modified with dopamine (CA-2,3-DA) through selective oxidation and Schiff base reactions, which was confirmed by FTIR and 1 H NMR measurements. Then, CA-2,3-DA membrane with high water permeability and excellent antifouling property was prepared by the phase inversion method. Compared with the original CA membrane, the CA-2,3-DA membrane maintained a higher rejection ratio for BSA (92.5%) with a greatly increased pure water flux (167.3 L m −2 h −1 ), which could overcome the trade-off between permeability and selectivity of the traditional CA membrane to a certain extent. According to static protein adsorption and three-cycle dynamic ultrafiltration experiments, the CA-2,3-DA membrane showed good antifouling performance and superior long-term performance stability, as supported by the experimental results, including flux recovery ratio, flux decline ratio, and filtration resistance. It is expected that this approach can greatly expand the high-value utilization of modified natural organic polysaccharides in separation engineering.

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“…The membrane material is the main factor to determine the membrane performance. Currently, polymer materials including cellulose and its 3 derivatives (Oprea and Voicu 2020), polysulfone (Liu and Kim 2011), polyolefins (Wang et al 2020) and fluorinated materials (Yu et al 2021) are most widely used in the field of membrane separation technology. However, due to the inherent hydrophobic properties of these membrane materials, they are easily contaminated during ultrafiltration process (Li et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Novel Dopamine-Modified Cellulose Acetate Ultrafiltration Membranes with Improved Separation and Antifouling Performances

Guo

Wang

et al. 2021

Preprint

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Cellulose derivatives are the earliest and most widely used membrane materials due to its many excellent characteristics, especially chemical activity and biodegradability. However, the hydrophobic properties of cellulose acetate (CA) limited its development to some extent. To improve the inherent hydrophobic and antifouling properties of the CA membrane, CA was successfully modified with dopamine (CA-2,3-DA) through selective oxidation and Schiff base reactions in this work, which was confirmed by 1H NMR and FTIR measurements. And then, the CA-2,3-DA membrane with high water permeability and the excellent antifouling property was prepared by the phase inversion method. Compared with the primordial CA membrane, the CA-2,3-DA membrane maintained a higher rejection rate for BSA (92.5%) while greatly increasing the pure water flux (167.3 L/m2h), which could be overcome the trade-off relationship between selectivity and permeability of the traditional CA membrane to a certain extent. According to the three-cycles dynamic ultrafiltration and static protein adsorption experiments, the CA-2,3-DA membrane showed good long-term performance stability and superior antifouling performance, which was supported by the experiment results including filtration resistance, flux decline ratio and flux recovery ratio. It is expected that this approach can greatly expand the high-value utilization of modified natural organic polysaccharides in separation engineering.

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Nafion-PTFE hollow fiber composite membranes for improvement of anti-fouling and anti-wetting properties in vacuum membrane distillation

Cited by 26 publications

References 48 publications

Wettability Studies of Capillary PTFE Membranes Applied for Membrane Distillation

Wettability Studies of Capillary PTFE Membranes Applied for Membrane Distillation

Novel dopamine-modified cellulose acetate ultrafiltration membranes with improved separation and antifouling performances

Novel Dopamine-Modified Cellulose Acetate Ultrafiltration Membranes with Improved Separation and Antifouling Performances

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