Hydrophilic and antifouling modification of PVDF membranes by one-step assembly of tannic acid and polyvinylpyrrolidone

Wu, Lili; Zhang, Chaocan; Chen, Wanyu; Liu, Cong

doi:10.1016/j.apsusc.2019.04.057

Cited by 87 publications

(42 citation statements)

References 35 publications

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“…However, PVDF polymer is hydrophobic with a typical contact angle of above 90 • [10], thus filtration of oil/water emulsion using a plain PVDF membrane results in low permeability and vulnerability from membrane fouling. Oil droplets in oil/water emulsion easily foul plain PVDF membrane since oil droplets can strongly adhere to the membrane surface [10]. Fortunately, PVDF-based membrane can be made hydrophilic by incorporating additives during membrane fabrication to overcome its high membrane fouling propensity [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Polyvinylidene fluoride (PVDF) polymer is one of the most popular materials used for the fabrication of membrane due to its good mechanical properties, chemical stability and excellent thermal resistance [ 9 ]. However, PVDF polymer is hydrophobic with a typical contact angle of above 90° [ 10 ], thus filtration of oil/water emulsion using a plain PVDF membrane results in low permeability and vulnerability from membrane fouling. Oil droplets in oil/water emulsion easily foul plain PVDF membrane since oil droplets can strongly adhere to the membrane surface [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, phase inversion is one of the most widely used methods for PVDF membrane fabrication due to its simplicity and fast process [ 25 ]. Despite its advantages, the blending of hydrophilic additives using this method suffers from a high tendency of additive leaching (washed away) during fabrication and filtration [ 10 , 26 ]; as such, its impact on enhancing hydrophilicity is largely reduced, resulting in a hydrophobic membrane. The additives have high affinity to water (typically used as a non-solvent in the phase inversion), promoting the mobility of the additive towards the water phase.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of Polyvinylidene Fluoride Membrane via Assembly of Tannic Acid and Polyvinylpyrrolidone for Filtration of Oil/Water Emulsion

et al. 2021

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Wastewater containing oil/water emulsion has a serious ecological impact and threatens human health. The impact worsens as its volume increases. Oil/water emulsion needs to be treated before it is discharged or reused again for processing. A membrane-based process is considered attractive in effectively treating oil/water emulsion, but progress has been dampened by the membrane fouling issue. The objective of this study is to develop polyvinylidene fluoride (PVDF) membranes customized for oil/water emulsion separation by incorporating assembly of tannic acid (TA) and polyvinylpyrrolidone (PVP) in the polymer matrix. The results show that the assembly of TA/PVP complexation was achieved as observed from the change in colour during the phase inversion and as also proven from the characterization analyses. Incorporation of the TA/PVP assembly leads to enhanced surface hydrophilicity by lowering the contact angle from 82° to 47°. In situ assembly of the TA/PVP complex also leads to enhanced clean water permeability by a factor of four as a result of enhanced mean flow pore size from 0.2 to 0.9 µm. Owing to enhanced surface chemistry and structural advantages, the optimum hydrophilic PVDF/TA/PVP membrane poses permeability of 540.18 L/(m2 h bar) for oil/water emulsion filtration, three times higher than the pristine PVDF membrane used as the reference.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Polyvinylidene Fluoride Membrane via Assembly of Tannic Acid and Polyvinylpyrrolidone for Filtration of Oil/Water Emulsion

et al. 2021

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“…Thus, some of the PVP was rinsed during the immersion process with water and ethanol. However, considering the results of hydrophilicity characterization (WCA in Table 3 ) and an increase in membrane flux, this proves that some PVP still existed in the blend membrane, and it was predicted that part of the PVP was capsulated by PSf on the membrane surface [ 38 , 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

Polysulfone–Polyvinyl Pyrrolidone Blend Polymer Composite Membranes for Batik Industrial Wastewater Treatment

et al. 2021

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Batik wastewater, in general, is colored and has high concentrations of BOD (biological oxygen demand), COD (chemical oxygen demand), and dissolved and suspended solids. Polysulfone (PSf)-based membranes with the addition of polyvinyl pyrrolidone (PVP) were prepared to treat batik industrial wastewater. PSf/PVP membranes were prepared using the phase inversion method with N-methyl-2 pyrrolidone (NMP) as the solvent. Based on the membrane characterization through FESEM, water contact angle, porosity, and mechanical tests showed a phenomenon where the addition of PVP provided thermodynamic and kinetic effects on membrane formation, thereby affecting porosity, thickness, and hydrophilicity of the membranes. The study aims to observe the effect of adding PVP on polysulfone membrane permeability and antifouling performance on a laboratory scale through the ultrafiltration (UF) process. With the addition of PVP, the operational pressure of the polysulfone membrane was reduced compared to that without PVP. Based on the membrane filtration results, the highest removal efficiencies of COD, TDS (total dissolved solid), and conductivity achieved in the study were 80.4, 84.6, and 83.6%, respectively, on the PSf/PVP 0.35 membrane operated at 4 bar. Moreover, the highest color removal efficiency was 85.73% on the PSf/PVP 0.25 operated at 5 bar. The antifouling performance was identified by calculating the value of total, reversible, and irreversible membrane fouling, wherein in this study, the membrane with the best antifouling performance was PSf/PVP 0.25.

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“… 8 PVPP hydrogels or copolymers of NVP and other monomers have also been investigated to remove pollutants from wastewater. 9 − 11 Additionally, metal–organic frameworks were dispersed in PVPP to improve the adsorption efficiency for sewage treatment. 12 …”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide–Crospolyvinylpyrrolidone Hybrid Microspheres for the Efficient Adsorption of 2,4,6-Trichlorophenol

2020

ACS Omega

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Microspheres of the graphene oxide and crospolyvinylpyrrolidone composite (GO–PVPP) were prepared via suspension polymerization and investigated for the adsorption of 2,4,6-trichlorophenol (2,4,6-TCP) from wastewater. The microspheres were thoroughly characterized using scanning electron microscopy, infrared spectroscopy, N 2 physisorption, elemental analysis, X-ray diffraction, and thermogravimetric analysis. The GO–PVPP microspheres comprised GO sheets on the surface and demonstrated good thermal stability, good swelling rate, and excellent adsorption capacity of 2,4,6-TCP (up to 466.77 mg/g). The adsorptions were determined as a function of pH, temperature, adsorbent loading, adsorption time, and initial content of 2,4,6-TCP in the solutions. The sorption kinetics was satisfactorily modeled using the pseudo-second-order rate equation, and the sorption equilibrium can be described using the Freundlich model. The 2,4,6-TCP adsorption by GO–PVPP was shown to be endothermic and spontaneous. The reusability of GO–PVPP was also demonstrated by the adsorption and desorption cycles.

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Hydrophilic and antifouling modification of PVDF membranes by one-step assembly of tannic acid and polyvinylpyrrolidone

Cited by 87 publications

References 35 publications

Development of Polyvinylidene Fluoride Membrane via Assembly of Tannic Acid and Polyvinylpyrrolidone for Filtration of Oil/Water Emulsion

Development of Polyvinylidene Fluoride Membrane via Assembly of Tannic Acid and Polyvinylpyrrolidone for Filtration of Oil/Water Emulsion

Polysulfone–Polyvinyl Pyrrolidone Blend Polymer Composite Membranes for Batik Industrial Wastewater Treatment

Graphene Oxide–Crospolyvinylpyrrolidone Hybrid Microspheres for the Efficient Adsorption of 2,4,6-Trichlorophenol

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