scholarly journals Influence of Preparation Temperature on the Properties and Performance of Composite PVDF-TiO2 Membranes

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 876
Author(s):  
Duc-Trung Tran ◽  
Jean-Pierre Méricq ◽  
Julie Mendret ◽  
Stephan Brosillon ◽  
Catherine Faur
Keyword(s):  
Phase Separation ◽  
Membrane Properties ◽  
High Porosity ◽  
Permeate Flux ◽  
Preparation Temperature ◽  
Membrane Formation ◽  
Compression Behavior ◽  
Membrane Morphology ◽  
Ternary Phase Diagrams ◽  
And Performance

Composite PVDF-TiO2 membranes are studied extensively in literature as effective anti-fouling membranes with photocatalytic properties. Yet, a full understanding of how preparation parameters affect the final membrane structure, properties and performance has not been realized. In this study, PVDF-TiO2 membranes (20 wt% TiO2/PVDF) were fabricated via the non-solvent-induced phase separation (NIPS) method with an emphasis on the preparation temperature. Then, a systematic approach was employed to study the evolution of the membrane formation process and membrane properties when the preparation temperature changed, as well as to establish a link between them. Typical asymmetric membranes with a high porosity were obtained, along with a vast improvement in the permeate flux compared to the neat PVDF membranes, but a reduction in mechanical strength was also observed. Interestingly, upon the increase in preparation temperature, a significant transition in membrane morphology was observed, notably the gradual diminution of the finger-like macrovoids. Other membrane properties such as permeability, porosity, thermal and mechanical properties, and compression behavior were also influenced accordingly. Together, the establishment of the ternary phase diagrams, the study of solvent–nonsolvent exchange rate, and the direct microscopic observation of membrane formation during phase separation, helped explain such evolution in membrane properties.

scholarly journals An Experimental Investigation: Effect of Phase Inversion Methods on Membrane Structure and Its Performance on PEG Filtration

2017 ◽  
Vol 17 (1) ◽  
Author(s):  
Masooma Irfan ◽  
Hatijah Basri ◽  
M. Irfan
Keyword(s):  
Phase Separation ◽  
Phase Inversion ◽  
Multiwall Carbon Nanotubes ◽  
Polymeric Membranes ◽  
Inversion Method ◽  
Inversion Process ◽  
Membrane Morphology ◽  
And Performance ◽  
Phase Inversion Method ◽  
Multiwall Carbon

In this work, the effect of different phase inversion process on membrane morphology and performance was studied. Polyethersulfone (PES) based polymeric membranes was fabricated containing polyvinylpyrrolidone (PVP) and carboxylic functionalized multiwall carbon nanotubes (MWCNT) as additives and polyethylene glycol (PEG) having a molecular weight 1K, 10K and 35K (Dalton) were used as a model solution for observing the rejection/filteration ability of fabricated membranes. Non-solvent induce phase separation (NIP) and dry-wet phase separation (DWP) method was adopted for membrane synthesis. The FTIR spectra showed that PVP/MWCNT was effectively blended with PES polymer and different phase inversion method led to different internal morphologies of membranes as confirmed by FESEM images. The PEG rejection results suggested that membranes formed by DWP method had approximately double rejection ability than membranes formed by NIP process.

scholarly journals Performance and Characterization for Blend Membrane of PES with Manganese(III) Acetylacetonate as Metalorganic Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
H. Abdallah ◽  
M. S. Shalaby ◽  
A. M. H. Shaban
Keyword(s):  
Membrane Surface ◽  
Lower Surface ◽  
Permeate Flux ◽  
Asymmetric Membrane ◽  
Sem Images ◽  
Blend Membrane ◽  
Membrane Morphology ◽  
Evaluation Of Performance ◽  
Angle Measurements ◽  
And Performance

This study describes the preparation, characterization, and evaluation of performance of blend Polyethersulfone (PES) with manganese(III) acetylacetonate Mn(acac)3to produce reverse osmosis blend membrane. The manganese(III) acetylacetonate nanoparticles were prepared by a simple and environmentally benign route based on hydrolysis of KMnO4followed by reaction with acetylacetone in rapid stirring rate. The prepared nanoparticle powder was dissolved in polymer solution mixture to produce RO PES/Mn(acac)3blend membrane, without any treatment of Polyethersulfone membrane surface. The membrane morphology, mechanical properties, and performance were presented. The scanning electron microscopy (SEM) images have displayed a typical asymmetric membrane structure with a dense top layer due to the migration of Mn(acac)3nanoparticles to membrane surface during the phase inversion process. Contact angle measurements have indicated that the hydrophilicity of the membrane was improved by adding Mn(acac)3. AFM images have proved excellent pores size distribution of blend membrane and lower surface roughness compared with bare PES. The desalination test was applied to blend membrane, where the blend membrane provided good performance; particularly, permeate flux was 24.2 Kg/m2·h and salt rejection was 99.5%.

scholarly journals The Formation of Polyvinylidene Fluoride Membranes with Tailored Properties via Vapour/Non-Solvent Induced Phase Separation

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 71 ◽  
Author(s):  
Tiziana Marino ◽  
Francesca Russo ◽  
Alberto Figoli
Keyword(s):  
Phase Separation ◽  
Polyvinylidene Fluoride ◽  
Pore Diameter ◽  
Membrane Properties ◽  
Triethyl Phosphate ◽  
Time Intervals ◽  
Membrane Morphology ◽  
Dope Solution ◽  
Bicontinuous Structure ◽  
Preparation Techniques

The present investigation reports as it is possible to prepared polyvinylidene fluoride (PVDF) membranes for microfiltration (MF) and ultrafiltration (UF) applications, by using triethyl phosphate (TEP) as non–toxic solvent in accordance with the Green Chemistry. Casting solutions containing different concentrations of polyethylene glycol (PEG) were prepared in order to study its effect on the final membrane morphology and properties. The possibility to finely modulate membrane properties was also investigated by applying two different membrane preparation techniques, the Non-Solvent Induced Phase Separation (NIPS) and its coupling with Vapour Induced Phase Separation (VIPS). Membranes’ morphology was detected by Scanning Electron Microscopy (SEM). Thickness, porosity, contact angle, pore size and water permeability were also recorded. Both the PEG content in the dope solution and the selected time intervals during which the nascent films were exposed to established relative humidity and temperature were found to play a crucial role in membrane formation. In particular, it was demonstrated as, by varying PEG content between 10 and 20 wt %, and by setting the exposure time to humidity at 0/2.5/5/7.5 min, membranes with different pore diameter and bicontinuous structure, suitable for UF and MF applications, could be easily obtained.

Effectiveness of a coagulation step and polyester support on blend polyvinylchloride membrane formation and performance

2019 ◽  
Vol 39 (4) ◽  
pp. 351-359 ◽  
Author(s):  
Heba Abdallah ◽  
Marwa S. Shalaby ◽  
Ayman El-gendi ◽  
Ahmed M. Shaban ◽  
Bao-Ku Zhu
Keyword(s):  
Mechanical Test ◽  
Solution Concentration ◽  
Precipitation Process ◽  
Permeate Flux ◽  
Membrane Formation ◽  
Membrane Performance ◽  
Ftir Spectrophotometry ◽  
Polyester Support ◽  
And Performance

Abstract The effectiveness of woven and nonwoven polyester support and coagulation time during membrane formation on the performance and characterization of prepared membranes was studied. The blend membranes of polyvinylchloride with cellulose acetate were prepared by the immersion precipitation process. The prepared membranes were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectrophotometry and a mechanical test. Membrane performance was tested using a feed of different synthetic salt solutions. The results proved that the prepared membrane using woven support provided the highest permeate flux and good salt rejection (93.3%) for a salty solution concentration of 20,000 ppm. The stress-strain mechanical test indicated that the excellent mechanical behavior was shown for membranes prepared with a woven support, which has a strength of 12.6 N/cm2 with an elongation of 25 mm for M8. A fouling test was carried out using a mixture solution of salt and humic acid. Using the prepared membranes with woven support provided the best antifouling properties with a flux recovery of 99.2% compared with a flux recovery of 96% using the prepared membrane without support.

scholarly journals Characteristics and Performance of PTU-Cu Composite Membrane Fabricated through Simultaneous Complexation and Non-Solvent Induced Phase Separation

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1743
Author(s):  
Marianito Tiangson Margarito ◽  
Arnel Bas Beltran ◽  
Aileen Huelgas-Orbecido
Keyword(s):  
Phase Separation ◽  
Color Change ◽  
Pure Water ◽  
Water Flux ◽  
Condensation Polymerization ◽  
Membrane Formation ◽  
Membrane Performance ◽  
Membrane Surfaces ◽  
Atomic Force ◽  
And Performance

This study aims to integrate copper (Cu) during membrane formation by a facile simultaneous phase separation process to alleviate biofouling and improve membrane performance. Polythiourea (PTU) polymer synthesized through condensation polymerization of 4,4-oxydianiline and p-phenylene diisothiocyanate in dimethyl sulfoxide was used in the preparation of dope solution. By incorporating different concentrations of cupric acetate in the non-solvent bath, both non-solvent induced phase separation and complexation induced phase separation occur instantaneously. Scanning electron microscopy—energy dispersive X-ray, fourier-transform infrared spectroscopy and time-of-flight secondary ion mass spectroscopy analysis accompanied by color change of the membrane surfaces—confirms the interaction of the polymer with Cu. Interaction of Cu at the interface during membrane formation results in a decrease in contact angle from 2 to 10° and a decrease in surface roughness from 30% to 52% as measured by atomic force microscope analysis. Pure water flux of PTU-Cu membrane increased by a factor of 3 to 17 relative to pristine PTU membrane. Both the pristine PTU and PTU-Cu membrane showed antibacterial characteristics against E. coli.

TIPS behavior for IPP/nano-SiO2 blend membrane formation and its contribution to membrane morphology and performance

2019 ◽  
Vol 27 (2) ◽  
pp. 467-475 ◽  
Author(s):  
Zhensheng Yang ◽  
Zheng Sun ◽  
Dongsheng Cui ◽  
Pingli Li ◽  
Zhiying Wang
Keyword(s):  
Membrane Formation ◽  
Blend Membrane ◽  
Nano Sio2 ◽  
Membrane Morphology ◽  
And Performance

Effect of Modified NanoSiO2 Agents on the Morphologies and Performances of UHMWPE Microporous Membrane via Thermally Induced Phase Separation

2016 ◽  
Vol 848 ◽  
pp. 726-732 ◽  
Author(s):  
Rong Liu ◽  
Yan Wang ◽  
Jing Zhu ◽  
Zu Ming Hu ◽  
Jun Rong Yu
Keyword(s):  
Phase Separation ◽  
Water Flux ◽  
Microporous Membranes ◽  
Thermally Induced Phase Separation ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Thermally Induced ◽  
And Performance ◽  
Surface Modified ◽  
Ultra High Molecular Weight

The effects of Modified NanoSiO2 Agents on the morphology and performance of ultra-high-molecular weight polyethylene (UHMWPE) microporous membranes via thermally induced phase separation were investigated in this work. The NanoSiO2 was surface modified by silane coupling agent KH570 (KH570-NanoSiO2). Differential scanning calorimetry (DSC) and X-Ray Diffraction (XRD) were performed to obtain crystallization of UHMWPE/white oil/ KH570-NanoSiO2 doped system. The morphology and performance of the prepared UHMWPE microporous membranes were characterized with scanning electron microscopy (SEM) and microfiltration experiments. The results showed that the morphology of UHMWPE membrane could be disturbed by KH570-NanoSiO2. Porosity and the rejection of Bovine serum albumin (BSA) of the blend membrane increased with increasing concentration of Modified NanoSiO2, while the water flux slightly decreased.

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