Morphology and performance of poly(vinylidene fluoride) flat sheet membranes: Thermodynamic and kinetic aspects

Enayatzadeh, Mohammad; Mohammadi, Toraj

doi:10.1002/app.46419

Cited by 11 publications

(5 citation statements)

References 38 publications

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“…It can be correlated to the combination effects of thermodynamic and kinetic of the polymer solution. An instable thermodynamic condition can generate an open structure with large finger‐like morphology whereas enhancement of the polymer solution viscosity (kinetic effect) can result in a sponge‐like morphology (Enayatzadeh & Mohammadi, 2018). From Figure 5a, by addition of sPEEK into the solution, a more open structure with larger finger‐likes was produced in the membrane medium.…”

Section: Resultsmentioning

confidence: 99%

Oily wastewater treatment by blend polyether imide‐sulfonated poly (ether ether keton) hollow fibre membrane through a side‐stream MBR process

Mehdi

Mansourizadeh

Ghaedi

et al. 2022

Water & Environment J

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The blend polyether imide‐sulfonated poly (ether ether keton) (PEI‐sPEEK) hollow fibre membrane was prepared for oily wastewater treatment of the natural gas liquid plant (NGL‐900, Gachsaran, Iran) through a side‐stream membrane bioreactor (MBR) process. Using PEI/sPEEK ratio of 90/10, a good compatibility of PEI and sPEEK polymers was achieved by DSC analysis. The modified membrane showed an open structure with large finger‐likes, overall porosity of about 80% and mean surface pore size of 10 nm. In addition, the membrane hydrophilicity significantly improved as water contact angle reduced from about 82° to 58°. In the MBR process, the improved membrane presented oil rejection, COD, TSS and turbidity reduction of about 99.9%, 99.7%, 98.9%, and 99.7%, respectively. The membrane showed a good antifouling property with flux recovery ratio (FRR) of 80.2% where the cake filtration was the dominant fouling mechanism. The modified membrane can be a promising alternative for treatment of industrial oily wastewater due to the enhanced properties.

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Section: Resultsmentioning

confidence: 99%

Oily wastewater treatment by blend polyether imide‐sulfonated poly (ether ether keton) hollow fibre membrane through a side‐stream MBR process

Mehdi

Mansourizadeh

Ghaedi

et al. 2022

Water & Environment J

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“…Although the experimental points of the four systems studied appeared very proximate at 293 K the position of the cloud points were significantly different between solvents (i.e., PVDF/DMAc/water vs. PVDF/NMP/water and PES/DMAc/water vs. PES/NMP/water) and between polymers (i.e., PVDF/DMAc/water vs. PES/DMAc/water and PVDF/NMP/water vs. PES/NMP/water). Cloud point experimental data obtained between 293 and 295 K (room temperature) are widely reported in the literature for the four systems studied [ 7 , 14 , 28 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ]. Experimental results of this study fall within the range of results previously reported at room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental results of this study fall within the range of results previously reported at room temperature. However, it is remarkable the huge dispersion of data reported for PVDF systems, especially in the PVDF/NMP/water system [ 41 , 44 ]. A relationship between the different polymer molecular weight characteristics of the polymers used in these studies with the variation of the cloud points reported was not found.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic Modeling and Validation of the Temperature Influence in Ternary Phase Polymer Systems

2021

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The effect of the temperature, as a process variable in the fabrication of polymeric membranes by the non-solvent induced phase separation (NIPS) technique, has been scarcely studied. In the present work, we studied the influence of temperature, working at 293, 313 and 333 K, on the experimental binodal curves of four ternary systems composed of PVDF and PES as the polymers, DMAc and NMP as the solvents and water as the non-solvent. The increase of the temperature caused an increase on the solubility gap of the ternary system, as expected. The shift of the binodal curve with the temperature was more evident in PVDF systems than in PES systems indicating the influence of the rubbery or glassy state of the polymer on the thermodynamics of phase separation. As a novelty, the present work has introduced the temperature influence on the Flory–Huggins model to fit the experimental cloud points. Binary interaction parameters were calculated as a function of the temperature: (i) non-solvent/solvent (g12) expressions with UNIFAC-Dortmund methodology and (ii) non-solvent/polymer (χ13) and solvent/polymer (χ23) using Hansen solubility parameters. Additionally, the effect of the ternary interaction term was not negligible in the model. Estimated ternary interaction parameters (χ123) presented a linear relation with temperature and negative values, indicating that the solubility of the polymers in mixtures of solvent/non-solvent was higher than expected for single binary interaction. Finally, PES ternary systems exhibited higher influence of the ternary interaction parameter than PVDF systems.

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“…For example, Marino et al [ 29 ], prepared a composite based on polyethersulfone (PES) by phase separation using a pleasant-smelling version of DMSO. Moreover, Enayatzadeh et al [ 31 ] and Arefi–Oskoui et al [ 32 ], reported thermodynamic and kinetic studies and the influence of different variables amount of PVDF on the physicochemical properties of the composite.…”

Section: Experimental Methodsmentioning

confidence: 99%

Biocompatible Piezoelectric PVDF/HA/AgNO3 Thin Film Prepared by the Solvent Casting Method

Markuniene

Rabiei

Nasiri

et al. 2022

Sensors

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In this study, new composites based on polyvinylidene fluoride (PVDF) were ornamented and prepared with hydroxyapatite (HA) and silver nitride (AgNO3). Taking into account the polarity of the solvent dimethyl sulfoxide, this solvent was used to disperse the particles. The aim of using DMSO was to create amorphous phases and the strong dipoles of the C–F bond to reduce the energy barrier and improve the electrical properties. The PVDF played the role of matrix in HA, and AgNO3 was used as reinforcing elements. X-ray diffraction of the samples directly showed the amorphous phase and mixed amorphous and crystalline phases when all three materials were used simultaneously for preparing the composite. The scanning electron microscopy (SEM) images of the samples confirmed the role of PVDF, HA, and AgNO3. Furthermore, the energy dispersive X-ray (EDX) analysis was performed and proved that the HA structure did not change when the ratio of Cap was equal to the ratio of natural HA. The electrical properties were investigated, and the amount of energy ranged from 56.50 to 125.20 mV. The final results showed that a designed device consisting of an active layer made of 0.1 g HA:0.5 g PVDF showed the highest energy barrier, the highest polarity, and surface energy, thus proving its relevance as potential material for energy harvesting applications.

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Morphology and performance of poly(vinylidene fluoride) flat sheet membranes: Thermodynamic and kinetic aspects

Cited by 11 publications

References 38 publications

Oily wastewater treatment by blend polyether imide‐sulfonated poly (ether ether keton) hollow fibre membrane through a side‐stream MBR process

Oily wastewater treatment by blend polyether imide‐sulfonated poly (ether ether keton) hollow fibre membrane through a side‐stream MBR process

Thermodynamic Modeling and Validation of the Temperature Influence in Ternary Phase Polymer Systems

Biocompatible Piezoelectric PVDF/HA/AgNO3 Thin Film Prepared by the Solvent Casting Method

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