PMMA Modified PVDF Hollow Fiber Ultrafiltration Membranes

2012 ◽  
Vol 465 ◽  
pp. 229-233 ◽  
Author(s):  
Xiao Mian Liu ◽  
Zong Hua Wang ◽  
Bing Yu ◽  
Hai Lin Cong ◽  
Xiu Ling Gao ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Vinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Rejection Rate ◽  
Dimethyl Formamide ◽  
Ultrafiltration Membranes ◽  
Foaming Agent ◽  
Poly Vinylidene Fluoride ◽  
Pure Water Flux

Polymethylmethacrylate (PMMA) modified poly(vinylidene fluoride) (PVDF) hollow fiber ultrafiltration membranes were prepared by wet spinning method using polyvinylpyrrolidone (PVP) as pore-foaming agent and mixture of dimethyl formamide (DMF)/methyl ethyl ketone (MEK) as solvent. The effects of PVDF, PMMA, PVP, and solvent ratios in the spinning solution on the permeation properties of the formed membranes were studied. The results showed that the performance of the membrane is the best with a pure water flux of 117 L/m2•h and rejection rate of 82% to bovine serum albumin (BSA), when the concentrations of PVDF, PMMA, PVP, DMF and MEK are 17, 3, 3, 60 and 17 wt%, respectively.

Preparation and Performance of Polysulfone Hollow Fiber Ultrafiltration Membranes

2013 ◽  
Vol 457-458 ◽  
pp. 309-312 ◽  
Author(s):  
Yang Bai ◽  
Zhen Liu ◽  
Dao Bao Sun
Keyword(s):  
Hollow Fiber ◽  
High Performance ◽  
Pure Water ◽  
Water Flux ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Membrane Structures ◽  
Ultrafiltration Membranes ◽  
Pure Water Flux ◽  
And Performance

Polysulfone (PSF) hollow fiber ultrafiltration membranes were successfully prepared by dry-wet spinning technology. Dimethylacetamide (DMAC) was used as a solvent, water was used as bore liquid and coagulation bath, polyvinylpyrrolidone (PVP) was used as polymeric additive. The effects of spinning conditions on membrane structures and properties were investigated in present study. The results indicated that with the increase of PVP concentration, pure water flux increased and developed finger-like pores were formed. High coagulation bath temperature restricted pure water flux, 30°C was the best for the preparation of high-performance ultrafiltration membranes. When the air length was 11cm, the membrane comprehensive performance was the best.

Effect of PVP Hydrophilic Additive on the Morphology and Properties of PVDF Porous Membranes

2014 ◽  
Vol 981 ◽  
pp. 891-894 ◽  
Author(s):  
Yun Wei Guo ◽  
Wei Wei Cui ◽  
Wen Hua Xu ◽  
Yang Jiang ◽  
Hui Hui Liu ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Porous Membrane ◽  
Porous Membranes ◽  
Inversion Method ◽  
Water Contact ◽  
Poly Vinylidene Fluoride ◽  
Pure Water Flux ◽  
Phase Inversion Method

This work describes the preparation and the properties of poly(vinylidene fluoride) (PVDF) porous membranes. The porous membrane was prepared using phase-inversion method by adding hydrophilic polyvinylpyrrolidone (PVP) as hole-agent. The contrastive analysis of membrane characterizations between the membrane no PVP added and the membrane added PVP were carried out by optical microscopy analysis, scanning electron microscopy, porosity, pure water flux and water contact angle. The results showed that adding PVP can induce the building of pore structure, increase the surface roughness and hydrophilicity of PVDF membrane, and then enhance its pure water flux.

Preparation and Characterization of Hydrophilic PVDF Hollow Fiber Ultrafiltration Membrane

2011 ◽  
Vol 480-481 ◽  
pp. 201-206
Author(s):  
Li Guo Wang ◽  
Xiu Ju Wang ◽  
Ai Min Wang ◽  
Wen Juan Liu ◽  
Shi Qi Guo ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Hollow Fiber ◽  
Polyvinylidene Fluoride ◽  
Breaking Strength ◽  
Pure Water ◽  
Water Flux ◽  
Technical Parameters ◽  
Rupture Pressure ◽  
Pure Water Flux

Hydrophilic Polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membranes were prepared by wet-spinning method. The effects of technical parameters of acrylic acid grafted onto PVDF on the performance of hydrophilic PVDF membranes were investigated via orthogonal test, the technical parameters of preparation of hydrophilic PVDF membranes were determined, and hydrophilic PVDF membranes were prepared. Then hydrophilic PVDF membranes were characterized in terms of breaking strength, breaking elongation, rupture pressure, pure water flux and rejection. The fouling properties and the conditions of acrylic acid grafted onto PVDF were also examined. The results showed that acrylic acid had been grafted onto PVDF, the breaking strength and rupture pressure improved greatly, and the fouling properties were better than PS hollow fiber UF membrane.

scholarly journals The Modification of PVDF Membrane via Crosslinking with Chitosan and Glutaraldehyde as the Crosslinking Agent

2018 ◽  
Vol 18 (1) ◽  
pp. 1
Author(s):  
Romaya Sitha Silitonga ◽  
Nurul Widiastuti ◽  
Juhana Jaafar ◽  
Ahmad Fauzi Ismail ◽  
Muhammad Nidzhom Zainol Abidin ◽  
...  
Keyword(s):  
Contact Angle ◽  
Vinylidene Fluoride ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Crosslinking Agent ◽  
Hydrophobic Properties ◽  
Pvdf Membrane ◽  
Pure Water Flux ◽  
Modified Membrane

Poly(vinylidene fluoride) (PVDF) has outstanding properties such as high thermal stability, resistance to acid solvents and good mechanical strength. Due to its properties, PVDF is widely used as a membrane matrix. However, PVDF membrane is hydrophobic properties, so as for specific applications, the surface of membrane needs to be modified to become hydrophilic. This research aims to modify PVDF membrane surface with chitosan and glutaraldehyde as a crosslinker agent. The FTIR spectra showed that the modified membrane has a peak at 1655 cm-1, indicating the imine group (–N=C)- that was formed due to the crosslink between amine group from chitosan and aldehyde group from glutaraldehyde. Results showed that the contact angle of the modified membrane decreases to 77.22° indicated that the membrane hydrophilic properties (< 90°) were enhanced. Prior to the modification, the contact angle of the PVDF membrane was 90.24°, which shows hydrophobic properties (> 90°). The results of porosity, Ɛ (%) for unmodified PVDF membrane was 55.39%, while the modified PVDF membrane has a porosity of 81.99%. Similarly, by modifying the PVDF membrane, pure water flux increased from 0.9867 L/m2h to 1.1253 L/m2h. The enhancement of porosity and pure water flux for the modified PVDF membrane was due to the improved surface hydrophilicity of PVDF membrane.

Preparation and Characterization of Poly(vinylidene) Fluoride Membranes Reinforced by Modified Nano-SiO2 Particles

2014 ◽  
Vol 789 ◽  
pp. 201-204
Author(s):  
Ai Wen Qin ◽  
Xiang Li ◽  
Bo Mou Ma ◽  
Xin Zhen Zhao ◽  
Chun Yi Liu ◽  
...  
Keyword(s):  
Pore Size ◽  
Vinylidene Fluoride ◽  
Cell Structure ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Cross Sectional ◽  
Antifouling Property ◽  
Poly Vinylidene Fluoride ◽  
Mechanical Performances

Poly (vinylidene fluoride) (PVDF) hybrid membranes reinforced by hydrophilic nanoSiO2 particles were fabricated from PVDF/N-dimethylacetamide (DMAc)/γ-butyrolactone (γ-BL) system via thermally induced phase separation (TIPS) process. Surface and cross-sectional morphology of membranes were characterized by scanning electron microscope (SEM). The properties such as permeability, mechanical performances and antifouling property were also determined. The results showed that the pore size of membrane surface became smaller, while cross-sectional morphology was changed from bicontinuous structure to cell structure, the pore size became larger and majorities of closed pores became open with the addition of hydrophilic nanoSiO2 particles in the system. Compared with pure membrane, pure water flux of hybrid membrane increased by 30.3%, i.e. from 290 to 378 L/(m2·h·0.1MPa), antifouling property increased from 63.1% to 80.2%. Meanwhile, tensile strength and elongation at break increased by 70.6% and124%, respectively.

The Effects of Nanocrystaline Cellulose on Polysulfone Hollow-Fiber Ultrafiltration Membrane

2012 ◽  
Vol 528 ◽  
pp. 210-213 ◽  
Author(s):  
Xuan Wang ◽  
Hao Long Bai ◽  
Li Ping Zhang
Keyword(s):  
Hollow Fiber ◽  
Phase Inversion ◽  
Hollow Fiber Membrane ◽  
Pure Water ◽  
Water Flux ◽  
Ultrafiltration Membrane ◽  
Fiber Membrane ◽  
Elongation At Break ◽  
Pure Water Flux ◽  
Scaning Electron Microscopy

Nanocrystalline cellulose was used to blend with polysulfone to improve the hydrophicility and mechanical properties of PS hollow fiber ultrafiltration membrane. The method of dry-jet/wet-spining was adopted to form the hollow fiber by the mechanism of phase-inversion. In addition, the content of NCC was increased gradually from 0% to 1 wt% to examin the permeation flux, rejection ratio of bovine serum albumin(BSA) and mechanical strength of PS hollow-fiber. We find that the pure water flux was soared when NCC content was increased. The tensile strength and elongation at break were also detected and calculated. The results indicated that the properties of PS hollow-fiber membrane with appropriate NCC content were enhanced. The hollow fiber membranes were also observed with scaning electron microscopy(SEM) to explore the porous structure

scholarly journals Application of high hydrophilic antifouling nanofiltration membranes embedded with mesoporous carbon based nanoparticles for efficient dye removal and salt rejection

2021 ◽  
Author(s):  
Azar Asadi ◽  
Foad Gholami ◽  
Ali Akbar Zinatizadeh ◽  
Hasan Jaberi
Keyword(s):  
Mesoporous Carbon ◽  
Pure Water ◽  
Water Flux ◽  
Cost Effective ◽  
Rejection Rate ◽  
Negative Surface ◽  
Pure Water Flux ◽  
Negative Surface Charge ◽  
Ph Conditions ◽  
Filtration Capacity

Abstract In this research, the application of mesoporous carbon CMK-3 and modified CMK-3 (M-CMK-3) to improve antifouling and rejection rate of polyethersulfone NF membrane was assessed. CMK-3 was modified with H-acid to increase hydrophilic characteristics of CMK-3. The synthesized CMK-3 and modified CMK-3 membranes exhibited a high pure water flux and also flux recovery ratio (up to 95%) compared with bare NF membrane. Also, the membranes with optimum additive loading (0.1wt%) of CMK-3 and M-CMK-3 were compared to reject different salts and dyes. From the obtained results, the membrane embedded with M-CMK-3 showed higher rejection rate rather than bare NF membrane (up to 95 % for Na2SO4and 64% for CaCl2) and also the flux permeability was increased from 6.44 for bare NF membrane to 20.11 kg/m2.h for the membrane embedded with M-CMK-3. A higher rejection data for different dyes under different pH conditions (up to 90%) was reported for the synthesized membrane embedded with M-CMK-3. After all, from the obtained data, M-CMK-3 with higher negative surface charge presented a higher performance to remove salts and dyes. This research was aimed to develop cost-effective NF membranes with high antifouling properties and super high filtration capacity for removing dyes and salts from wastewaters.

Preparation and Characterizations of Polysulfone Flat Ultrafiltration Membranes

2011 ◽  
Vol 418-420 ◽  
pp. 169-172
Author(s):  
Shan Zhang ◽  
Zhen Liu
Keyword(s):  
Pure Water ◽  
Water Flux ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Egg Rejection ◽  
Evaporation Time ◽  
Ultrafiltration Membranes ◽  
Pure Water Flux ◽  
Coagulation Bath Temperature

The Polysulfone Flat ultrafiltration membranes were prepared with dimethylacetamide (DMAc) as solvent and polyvinypyrrolidone (PVP) as pore forming additive. Performance of PSF membrane such as pure water flux, albumin egg rejection were investigated. In addition, the same investigations were conducted with different coagulation bath temperature and evaporation time. The results show that there were a maximum of pure water flux and a minimum of the retention of Albumin when PVP content reach 14%.

Preparation and Characterization of BaBi2Nb2O9/PVDF Inorganic-Organic Composite Ultrafiltration Membranes

2013 ◽  
Vol 681 ◽  
pp. 309-313
Author(s):  
Dong Hua Zhang ◽  
Li Jing Pan ◽  
Da Zhi Sun
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Composite Membranes ◽  
Rejection Rate ◽  
Inversion Method ◽  
Ultrafiltration Membranes ◽  
Cross Sectional ◽  
Uf Membranes ◽  
Phase Inversion Method

BaBi2Nb2O9/PVDF (polyvinylidene fluoride) composite ultrafiltration (UF)membranes were prepared by alloying BaBi2Nb2O9 (BBN) particles uniformly in the PVDF solution (15% polymer weight) and used a phase-inversion method. This paper studied the effect of the concentration of BBN from 0% to 5% in 0.2Mpa on pure water flux and rejection rate to Bovine serum albumin (BSA). The cross-sectional structures of composite membranes were observed by scanning electron microscopy (SEM). Moreover, XRD results revealed the crystal structure of PVDF. The experimental results showed that the BBN/PVDF composite ultrafiltration membranes were superior in separation performances than the pure PVDF membranes due to the addition of BBN.

Preparation and Characterization of Poly (vinylidene fluoride) Hollow Fiber Membranes via Modified Thermally Induced Phase Separation Process

2013 ◽  
Vol 734-737 ◽  
pp. 2172-2175 ◽  
Author(s):  
Ai Wen Qin ◽  
Xiang Li ◽  
Bo Mou Ma ◽  
Chun Yi Liu ◽  
Xin Zhen Zhao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Hollow Fiber ◽  
Vinylidene Fluoride ◽  
Hollow Fiber Membrane ◽  
Pure Water ◽  
Thermally Induced Phase Separation ◽  
Hollow Fiber Membranes ◽  
Thermally Induced ◽  
Fiber Membranes ◽  
Poly Vinylidene Fluoride

Poly (vinylidene fluoride) (PVDF) hollow fiber membranes were successfully prepared using DMAc/γ-BL as the mixed diluent and PEG as the additive through modified thermally induced phase separation (M-TIPS) process. The membranes prepared were characterized by scanning electron microscope. Their properties such as water permeability and mechanical properties were also determined. The results show that PVDF membranes have spherical crystallites structure with interconnected network structure because of the combination of solidliquid and liquid-liquid phase separation. When using 25wt% aqueous ethanol solution as the coagulation, the PVDF hollow fiber membrane shows the tensile strength, i.e.4.59MPa and pure water flux, i.e.415 L/ (m2·h).

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