Fabrication and characterization of polyvinylidene fluoride/zinc oxide membranes with antibacterial property

2019 ◽  
Vol 69 (2) ◽  
pp. 122-133 ◽  
Author(s):  
Juan Xiong ◽  
Yexia Gong ◽  
Cong Ma ◽  
Xingtao Zuo ◽  
Jiajie He
Keyword(s):  
Polyvinylidene Fluoride ◽  
High Performance ◽  
Water Flux ◽  
Membrane Properties ◽  
Inversion Method ◽  
X Ray Diffraction ◽  
Zno Nps ◽  
Membrane Performance ◽  
Phase Inversion Method

Abstract The hydrophilic and antimicrobial polyvinylidene fluoride (PVDF) membrane was fabricated by phase inversion method. The prepared membranes with various concentrations of ZnO nanoparticles (NPs) were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and membrane properties were investigated in terms of hydrophilicity, water flux, BSA solution filtration experiments, etc. Antibacterial testing was also performed to examine the practicability of the PVDF-ZnO membranes in overcoming biofouling. The results of FTIR and XRD confirmed the presence of ZnO NPs in the polymer matrix. The membrane performance demonstrated the significance of hydrophilic nanoparticles towards the enhancement of membrane properties. The optimum amount of ZnO NPs was 1.5 wt% with a lower contact angle as well as highest flux and lowest filtration resistance. The presence of ZnO NPs in the membrane matrix exhibited a strong antibacterial activity increased with the increasing ZnO NPs' content. Incorporation of ZnO NPs into PVDF membranes may have great potential in developing high-performance antifouling membranes for separation process.

scholarly journals The influences of polydopamine immersion time on characteristics and performance of polyvinylidene fluoride ultrafiltration membrane

2018 ◽  
Vol 197 ◽  
pp. 09007
Author(s):  
Syawaliah Syawaliah ◽  
Nasrul Arahman ◽  
Medyan Riza ◽  
Sri Mulyati
Keyword(s):  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Sem Analysis ◽  
Inversion Method ◽  
Asymmetric Structure ◽  
Pvdf Membrane ◽  
Before And After ◽  
Poly Ethylene ◽  
And Performance ◽  
Phase Inversion Method

The Polyvinylidene Fluoride (PVDF) membrane has been prepared by phase inversion method using N,N-dimethylacetamide (DMAc) as solvent and Poly Ethylene Glycol (PEG) as additive. The fabricated membrane was modified by Polydopamine (PDA) coating in concentration of 0.5 mg/ml and immersion times of 2 hours, 6 hours, and 24 hours. The characteristics and performance of the PVDF membranes before and after the modification are studied in this paper. The result of the water flux experiment showed that the PDA-coated PVDF membranes showcased a higher flux than that of pure PVDF membrane. Scanning Electron Microscopy (SEM) analysis confirmed that the membrane had an asymmetric structure consisting of two layers. There was no significant influence on the addition of PDA to the morphology of the pore matrix because the modification was done by surface coating. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that PDA was successfully introduced on the surface of PVDF membrane with the appearance of O-H from cathecol and N-H peaks at wavenumber range of 3300-3600 cm-1. Modification with PDA increased the mechanical strength of the membrane which affirmed by the results of the tensile and elongation at break evaluation.

Novel Nanoparticles Incorporated Polyvinylidene Fluoride Ultrafiltration Membrane

2013 ◽  
Vol 746 ◽  
pp. 390-393
Author(s):  
Qiong Zhi Gao ◽  
Hong Qiang Li ◽  
Xing Rong Zeng
Keyword(s):  
Polyvinylidene Fluoride ◽  
Phase Inversion ◽  
Water Flux ◽  
Silver Ions ◽  
Inversion Method ◽  
Hybrid Films ◽  
Ultrafiltration Membranes ◽  
Pvdf Membrane ◽  
Basic Performance ◽  
Phase Inversion Method

In this study, polyvinylidene fluoride (PVDF) composite ultrafiltration membranes were prepared by a phase inversion method, N,N-dimethylacetamide (DMAc) was used as solvent and polyvinylpyrrolidone (PVP) was used as dispersant, nanoTiO2 and AgNO3 were used as addictive materials. With different doping content of nanoTiO2 and silver ions, those hybrid films have different functions and structure. The basic performance and photocatalytic properties of those ultrafiltration membranes were studied in detail. The experiment results show that adding nanosized TiO2 particles will make the porosity of PVDF membrane increase, adding silver ion with low content can not improve water flux and porosity of membranes, however, nanoTiO2 and silver ions doping together can effectively improve the photocatalytic degradation rate.

scholarly journals Improved salt rejection, hydrophilicity and mechanical properties of novel thermoplastic polymer/chitosan nanofibre membranes

2020 ◽  
Vol 15 ◽  
pp. 155892502092317
Author(s):  
Fahad S Al-Mubaddel ◽  
Hamad S AlRomaih ◽  
Mohammad Rezaul Karim ◽  
Monis Luqman ◽  
Maher M Al-Rashed ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Polyvinylidene Fluoride ◽  
Phase Inversion ◽  
Water Flux ◽  
Tensile Tests ◽  
Membrane Properties ◽  
Inversion Method ◽  
Thermoplastic Polymer ◽  
Salt Rejection

The present study reports on the preparation of novel nanofibre membranes from the thermoplastic polymer polyvinylidene fluoride coated with chitosan to enhance membrane properties such as hydrophilicity, mechanical properties, water flux and salt rejection. Initially, a supporting layer was produced from polyvinylidene fluoride using phase inversion methods, followed by being coated with chitosan using either electrospinning or immersion methods. Two types of fabricated membranes with different coating methods were characterized and tested for physical and chemical performance using field-emission scanning electron microscopy, tensile tests, permeation tests (water flux and salt rejection) and contact angle measurements. It was found that the support membrane (polyvinylidene fluoride) produced by the phase inversion method that was coated with chitosan using electrospinning showed better performance, with a salt rejection up to 70% for MgSO4, a decreased the contact angle (52°) and improved the elongation at the breaking point (~82%).

The Effect of Synthetic Silica on Ultrafiltration PSf Membrane

2013 ◽  
Vol 65 (4) ◽  
Author(s):  
Zawati Harun ◽  
Mohd Riduan Jamalludin ◽  
Hatijah Basri ◽  
Muhamad Fikri Shohur ◽  
Nurafiqah Rosman ◽  
...  
Keyword(s):  
Pure Water ◽  
Water Flux ◽  
Inversion Method ◽  
X Ray Diffraction ◽  
Weight Percentage ◽  
Pure Water Flux ◽  
Dope Solution ◽  
And Performance ◽  
Polyethelene Glycol ◽  
Phase Inversion Method

This study investigates the effects of synthetic silica(SiO2)with different weight percentage concentrations on the morphology and performance of the polysulfone (PSf) and polyethelene glycol (PEG) based membrane ultrafiltration (UF). Phase inversion method was used to prepare PSf/PEG ultrafiltration (UF) flatsheet membrane. SiO2 and N-Methyl 2 Pyrrolidone (NMP) were used as an additive and solvent respectively. The fabricated membrane was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and the performances of the membranes were measured in term of pure water flux by using distilled water and solute rejection at different wastewater concentration at 50%, 75% and 87.5%. The result showed that the addition of 2% silica in the dope solution increased the permeation in terms pure water flux and the best rejection with 62 Lm-2 h-1 and 89% (at 87.5 % waste water dilution) respectively

scholarly journals Insights into the Influence of Membrane Permeability and Structure on Osmotically-Driven Membrane Processes

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 153
Author(s):  
Jing Wei ◽  
Qianhong She ◽  
Xin Liu
Keyword(s):  
High Performance ◽  
Water Flux ◽  
Forward Osmosis ◽  
Feed Solution ◽  
Cellulose Triacetate ◽  
Membrane Properties ◽  
Structural Parameter ◽  
Separation Performance ◽  
Membrane Performance ◽  
Internal Concentration

The success of osmotically-driven membrane (OM) technology relies critically on high-performance membranes. Yet trade-off of membrane properties, often further complicated by the strongly non-linear dependence of OM performance on them, imposes important constraint on membrane performance. This work systematically characterized four typical commercial osmotic membranes in terms of intrinsic separation parameters, structure and surface properties. The osmotic separation performance and membrane scaling behavior of these membranes were evaluated to elucidate the interrelationship of these properties. Experimental results revealed that membranes with smaller structural parameter (S) and higher water/solute selectivity underwent lower internal concentration polarization (ICP) and exhibited higher forward osmosis (FO) efficiency (i.e., higher ratio of experimental water flux over theoretical water flux). Under the condition with low ICP, membrane water permeability (A) had dominant effect on water flux. In this case, the investigated thin film composite membrane (TFC, A = 2.56 L/(m2 h bar), S = 1.14 mm) achieved a water flux up to 82% higher than that of the asymmetric cellulose triacetate membrane (CTA-W(P), A = 1.06 L/(m2 h bar), S = 0.73 mm). In contrast, water flux became less dependent on the A value but was affected more by membrane structure under the condition with severe ICP, and the membrane exhibited lower FO efficiency. The ratio of water flux (Jv TFC/Jv CTA-W(P)) decreased to 0.55 when 0.5 M NaCl feed solution and 2 M NaCl draw solution were used. A framework was proposed to evaluate the governing factors under different conditions and to provide insights into the membrane optimization for targeted OM applications.

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.

Hydrophilic modification of PVDF membranes by in situ synthesis of nano-Ag with nano-ZrO2

2021 ◽  
Vol 10 (1) ◽  
pp. 538-546
Author(s):  
Yanjun Lu ◽  
Yuxuan Ma ◽  
Tong Yang ◽  
Jifeng Guo
Keyword(s):  
Polyvinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Inversion Method ◽  
Hydrophilic Modification ◽  
E Coli ◽  
Pure Water Flux ◽  
Modified Membrane ◽  
Phase Inversion Method

Abstract Modified polyvinylidene fluoride (PVDF) membranes were prepared by the phase inversion method via blending in situ formed nanosilver (Ag) and nanozirconium dioxide (ZrO2). Scanning electron microscopy of the membranes revealed that the surface pore size of the membranes was increased and distributed widely with the addition of modified nanosilver (Ag) and nanozirconium dioxide (ZrO2). The pores of the membrane were reduced due to excessive modification of the material when the content of zirconium dioxide was increased to 0.4%. XRD characterization showed that in situ synthesis of nanosilver (Ag) and nanozirconium dioxide (ZrO2) had been successfully blended in the membranes. The contact angle of the modified membrane ranged from 82.72° to 67.37°, which showed that the hydrophilic properties of the membrane were improved. The pure water flux of the modified membrane increased from 28.43 to 143.2 L/m2 h, indicating that the hydrophilicity of the modified membrane was enhanced significantly. The flux recovery rate of the modified membrane was obviously increased in the fouling experiment with BSA as the source of organic pollutants. The antimicrobial contamination of the membrane was greatly enhanced with the E. coli microbial contamination experiment.

scholarly journals Organically Modified Nanoclay Filled Thin-Film Nanocomposite Membranes for Reverse Osmosis Application

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3803 ◽  
Author(s):  
Syed Zaidi ◽  
Farid Fadhillah ◽  
Haleema Saleem ◽  
Alaa Hawari ◽  
Abdelbaki Benamor
Keyword(s):  
Thin Film ◽  
Reverse Osmosis ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Membrane Properties ◽  
X Ray Diffraction ◽  
Membrane Performance ◽  
Transmission Electron ◽  
First Time ◽  
Hexane Solution

This study validates, for the first time, the effectiveness of two nanoclays, that is, cloisite (CS)-15A and montmorillonite (MNT) at the polyamide (PA) active layer in the reverse osmosis (RO) membrane. Cloisite-15A is natural montmorillonite modified with dimethyl dihydrogenated tallow quaternary ammonium salt. Thin-film composite (TFC) membranes were fabricated by the interfacial polymerization (IP) process between the trimesoylchloride (TMC)–n-hexane solution and m-phenylenediamine (MPD)–aqueous solution; the IP process took place on a polysulfone support sheet. The two types of nanoparticles were added in various weight ratios (0.005 wt.%–0.04 wt.%) in the n-hexane solution of TMC. Different characterizations like X-ray diffraction (XRD), contact angle, transmission electron microscopy (TEM), and membrane performance tests were performed to analyse the membrane properties. Both XRD and TEM studies proved that the two nanoclays are successfully anchored at the different sites of the PA layer. CS-15A could accelerate the water flux from 15 to 18.65 L/m2·h with NaCl rejection enhancement from 72% to 80%, relative to the control membrane. Conversely, MNT also enhanced the flux from 15 to 40 L/m2·h, but NaCl rejection reduced from 70% to 23%. The mechanism of water uptake in nanoclays was also discussed. The results pave the way for a complete future study, in which these phenomena should be studied in great detail.

Effect of PVP content and polymer concentration on polyetherimide (PEI) and polyacrylonitrile (PAN) based ultrafiltration membrane fabrication and characterization

2018 ◽  
Vol 2017 (2) ◽  
pp. 329-339 ◽  
Author(s):  
Sevgi Güneş-Durak ◽  
Türkan Ormancı-Acar ◽  
Neşe Tüfekci
Keyword(s):  
Pure Water ◽  
Polymer Concentration ◽  
Water Flux ◽  
Inversion Method ◽  
Membrane Thickness ◽  
Average Roughness ◽  
Membrane Performance ◽  
Membrane Fabrication ◽  
Pure Water Flux ◽  
Phase Inversion Method

Abstract In this study, four different membranes were fabricated by using polyetherimide and polyacrylonitrile polymers, N-methyl-2-pyrrolidone and polyvinylpyrrolidone (PVP) via phase inversion method to improve the membrane performance in fruit juice wastewater (FJWW) treatment. The addition of PVP to the casting solution increased membrane hydrophilicity, water content, contact angle, porosity, Fourier transform infrared spectroscopy peaks, membrane thickness, average roughness and viscosity of cast solutions compared to the bare membrane. It can be said that the addition of a lower polymer concentration and PVP intensively increases the pure water flux of the membrane. However, as the flux increased, a small decrease in FJWW rejection was observed.

scholarly journals Influence of Polymer Concentration on Membrane Performance in Wastewater Treatment

2018 ◽  
Vol 55 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Laurentia Geanina Tiron ◽  
Stefan Catalin Pintilie ◽  
Andreea Liliana Lazar ◽  
Maria Vlad ◽  
Stefan Balta ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Pure Water ◽  
Polymer Concentration ◽  
Water Flux ◽  
Inversion Method ◽  
Membrane Performance ◽  
Treatment Technologies ◽  
Pure Water Flux ◽  
Angle Method ◽  
Phase Inversion Method

Water is an important element of life, while every industry in its processes uses an important amount of water. Following processes, the water is contaminated and requires water treatment technologies. Unconventional methods to wastewater treatment, in the last years, use membrane technology as one of the most reliable processes for contaminants removal. In this article, the influence of the different concentrations of polysulfone (PSf) on the polymeric membranes properties was studied. These membranes were obtained through phase inversion method and with different polymer concentrations: 23, 25, 27 and 30 wt.%. The performance of the membranes was studied by pure water flux, permeability and retention. It has been observed that by increasing the polymer concentration, the pure water flux and the permeability will decrease. Retention was determined using methylene blue, which is one of the most utilized dye from industry and it could be observed that by increasing the polymer concentration the retention degree of the pollutant also increases. In order to explain the evolution of membrane permeability at different polymer concentrations, surface hydrophilicity by contact angle method and cross-section SEM imaging were used.

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