Morphological and hydrophobic modifications of PVDF flat membrane with silane coupling agent grafting via plasma flow for VMD of ethanol–water mixture

Xu, Wan-Ta; Zhao, Zhi‐Ping; Liu, Min; Chen, Kangcheng

doi:10.1016/j.memsci.2015.05.024

Cited by 52 publications

(30 citation statements)

References 44 publications

(49 reference statements)

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“…a), two weak peaks at 3,650 and 1,680 cm −1 can be observed in Fig. b, corresponding to the hydroxyl groups (–OH) and the carbonyl bond (–C=O) of the membrane surface after water plasma treatment, which was consistent with previous work . For PVDF‐KH550, the peaks at 1,560 and 1,140 cm −1 (Fig.…”

Section: Resultssupporting

confidence: 89%

See 1 more Smart Citation

Immobilization of carbonic anhydrase on polyvinylidene fluoride membranes

Sun

Wei

Wang

et al. 2018

Biotech and App Biochem

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In recent years, the application of carbonic anhydrase (CA) in CO removal has attracted great interest. However, obtaining high enzyme recovery activity is difficult in existing immobilization techniques. In this work, water plasma-treated poly(vinylidene fluoride) (PVDF) membranes were modified via 3-aminopropyl triethoxy silane (KH550) or γ-(2, 3-epoxypropoxy) propyl trimethoxy silane (KH560), and then CA was attached. The immobilization process was optimized, and the catalytic properties of PVDF-attached CA were characterized. The maximum activity recovery of PVDF-KH550-CA was 60%, whereas that of PVDF-KH560-CA was 33%. The K values of PVDF-KH550-CA, PVDF-KH560-CA, and free enzyme were 9.97 ± 0.37, 12.5 ± 0.2, and 6.18 ± 0.23 mM, respectively, and their K /K values were 206 ± 2, 117 ± 5, and 488 ± 4 M ·Sec . PVDF-attached CA shows excellent storage stability and reusability, and their half-life values were 82 and 78 days at 4 °C. At 25 °C, they were 50 and 37 days, respectively. PVDF-KH550-CA and PVDF-KH560-CA retained approximately 85% and 72% of the initial activity after undergoing 10 cycles. In the presence of them, the generation rates of CaCO were 76% and 65% of the free CA system, which were 1.6 and 1.3 times that of the blank system, respectively. Its role in accelerating CO sequestration holds great promise for its practical application.

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Section: Resultssupporting

confidence: 89%

“…The procedures for surface modification of the PVDF membrane refer to those already reported . The original PVDF membrane was placed on a porous stainless steel holder clamped between a stainless steel joint and glass chamber (90 mm in diameter, 500 mm in length).…”

Section: Methodsmentioning

confidence: 99%

Immobilization of carbonic anhydrase on polyvinylidene fluoride membranes

Sun

Wei

Wang

et al. 2018

Biotech and App Biochem

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“…However, in most cases, the hydrophobicity of the fabricated PVDF membranes, with water contact angles (WCAs) of membrane surface between 90° and 105°, usually does not meet the super hydrophobic demands for utilization in distillation, desalination, and gas absorption or separation . For this purpose, efforts have been made to design and fabricate super hydrophobic PVDF membranes by regulating the composition of coagulation bath, incorporating hydrophobic particles or polymers, bonding hydrophobic molecules, or formatting of hydrophobic films or coatings …”

Section: Introductionmentioning

confidence: 99%

Regulation of the microstructure of polyvinylidene fluoride membrane via incorporation of nano‐ZIF‐7 for improving hydrophobicity and antiwetting performance

Wang

Shi

et al. 2019

J Chinese Chemical Soc

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The design and fabrication of a membrane with super hydrophobicity and antiwetting property is of great importance for improving membrane performance in distillation, desalination, gas absorption, and separation. In this work, polyvinylidene fluoride (PVDF) membranes were modified by Zeolitic Imidazolate Framework-7 (ZIF-7) nanocrystals to improve the hydrophobic property and antiwetting performance. ZIF-7/PVDF hybrid membranes were prepared via the nonsolvent-induced phase separation (NIPS) method. Different concentrations of ZIF-7 nanocrystals (0, 0.5, 1, 2, 3, and 5 wt%) were introduced into the PVDF dope solution, and the physical structure of the resulting membranes were systematically characterized. Due to the hydrophobic nature of ZIF-7 nanocrystals, the solventnonsolvent exchange rate had been regulated effectively during phase inversion.The morphology of top and bottom surfaces, together with the inner structures of the hybrid membrane, has been changed obviously, showing a more twisted fingerlike macrovoid layer and a thicker sponge-like layer compared to pristine PVDF membrane. Furthermore, the hydrophobicity and antiwetting properties of these hybrid membranes improved obviously when the incorporated concentration of ZIF-7 was higher than 1 wt%. The M(2) membrane, which possessed the highest surface roughness and water contact angles, showed the best antiwetting property and recovered gas permeance ratio (>95%) after being immersed in aqueous solution for 10 hr. K E Y W O R D Santiwetting, hydrophobic, membrane, metal-organic framework, morphology, nanomaterials

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“…During the MD process only vapors of solvent (water) are allowed to pass across the membrane. Concerning scientific literature focused on MD application, it is possible to find application of commercially-available hollow fiber or flat-sheet microfiltration membranes [16,[21][22][23][24][25][26][27][28][29]. The utilization of these membranes in MD is associated with their hydrophobic properties, decent porosity, as well as adequate pore sizes.…”

Section: Introductionmentioning

confidence: 99%

“…The utilization of these membranes in MD is associated with their hydrophobic properties, decent porosity, as well as adequate pore sizes. Nevertheless, these membranes are not the perfectly-designed and dedicated to membrane distillation, therefore they suffer from wetting problems as well as low permeability and short life span [9,[21][22][23][24][25][26]30].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Ceramic Membranes for Water Desalination

et al. 2017

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Hydrophilic ceramic membranes (tubular and planar) made of TiO 2 and Al 2 O 3 were efficiently modified with non-fluorinated hydrophobic grafting molecules. As a result of condensation reaction between hydroxyl groups on the membrane and reactive groups of modifiers, the hydrophobic surfaces were obtained. Ceramic materials were chemically modified using three various non-fluorinated grafting agents. In the present work, the influence of grafting time and type of grafting molecule on the modification efficiency was evaluated. The changes of physicochemical properties of obtained hydrophobic surfaces were determined by measuring the contact angle (CA), roughness (RMS), and surface free energy (SFE). The modified surfaces were characterized by contact angle in the range of 111-132 • . Moreover, hydrophobic tubular membranes were utilized in air-gap membrane distillation to desalination of sodium chloride aqueous solutions. The observed permeate fluxes were in the range of 0.7-4.8 kg·m −2 ·h −1 for tests with pure water. The values of permeate fluxes for membranes in contact with NaCl solutions were smaller, within the range of 0.4-2.8 kg·m −2 ·h −1 . The retention of NaCl in AGMD process using hydrophobized ceramic membranes was close to unity for all investigated membranes.

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Morphological and hydrophobic modifications of PVDF flat membrane with silane coupling agent grafting via plasma flow for VMD of ethanol–water mixture

Cited by 52 publications

References 44 publications

Immobilization of carbonic anhydrase on polyvinylidene fluoride membranes

Immobilization of carbonic anhydrase on polyvinylidene fluoride membranes

Regulation of the microstructure of polyvinylidene fluoride membrane via incorporation of nano‐ZIF‐7 for improving hydrophobicity and antiwetting performance

Hydrophobic Ceramic Membranes for Water Desalination

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