scholarly journals Purification of emulsified oil by Bentonite loaded polyvinylidene fluoride/polyvinylpyrrolidone membrane

2020 ◽  
Vol 15 (2) ◽  
pp. 394-403
Author(s):  
F. U. Nigiz ◽  
A. I. Yucak ◽  
N. D. Hilmioglu
Keyword(s):  
Soybean Oil ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Bentonite Clay ◽  
Hazelnut Oil ◽  
Oil Uptake ◽  
Volatile Oils ◽  
Lubricant Oil ◽  
Continuous Filtration ◽  
Simulated Wastewater

Abstract In this study, a Bentonite clay incorporated polyvinylfluoride (PVDF) and polyvinyl pyrrolidone (PVP) based adsorbent membrane was produced for the selective separation of oils from simulated wastewater. This membrane was produced as an intelligent material that selectively separates emulsified oils from water when it is used as adsorbent and purifies water when it is used in continuous membrane filtration. The affinity of the membrane to oil components was determined by water-oil uptake tests. The uptake experiments were conducted for soybean oil, hazelnut oil, lubricant oil and other volatile oils. As a result, membranes absorbed greater than 200 wt.% of oil when the membranes were immersed in the soybean oil, hazelnut oil and lubricant oil. When the same membranes were used for continuous filtration, greater than 85% of oil rejection values were obtained. As the PVP ratio in the membrane increased, flux values enhanced gradually. Bentonite incorporation simultaneously improved flux values and oil rejection remarkably. The soybean rejection increased from 69.1% to 90.9%, hazelnut oil rejection increased from 78% to 99.98%, and lubricant oil rejection enhanced from 80.5% to 96.5% when the bentonite amount was increased from 0 wt.% to 15 wt.%.

Effect of Ammonia as an Inert Solvent on Structure and Separation Performance for Oil/Water Mixtures of PVDF Porous Membranes

2015 ◽  
Vol 645-646 ◽  
pp. 269-274
Author(s):  
Wei Wei Cui ◽  
Jing Qiang Liu ◽  
Li Zhu Liu ◽  
Wen Hua Xu ◽  
Yuan Yuan Li ◽  
...  
Keyword(s):  
Pore Size ◽  
Polyvinylidene Fluoride ◽  
Membrane Surface ◽  
Separation Performance ◽  
Water Mixture ◽  
Oil Uptake ◽  
Hydrophobic Property ◽  
Phase Inversion Technique ◽  
Inert Solvent ◽  
Oil Water

Porous polyvinylidene fluoride (PVDF) membranes were prepared from PVDF and N-methyl-2-pyrrolidone (NMP) solution system using immersion precipitation phase inversion technique with ammonia as an inert solvent additive. The effects of ammonia amount on pore size, surface morphology, crystallinity, hydrophobic property, oil uptake and water-oil separation performance of the membranes were investigated. It was found that all membranes had an interpenetrating porous structure. The increase of ammonia amount led to significant variations in morphology. Lots of tiny apophysis formed on the membrane surface, pore size deceased, and pore density increased with the increase of ammonia amount. The crystallinity decreased with increasing ammonia amount, and hydrophobic property was improved. The membrane showed high oil uptake and effective separation function of oil-water mixture.

scholarly journals Preparation and Characterization of Matrix Hybrid Membranes Polyvinylidene Fluoride/Polyvinylpyrrolidone/Silica Gel/Zinc Oxide for Cr(VI) Removal from Water

2020 ◽  
Vol 44 (5) ◽  
pp. 311-318
Author(s):  
Mustapha Chabane ◽  
Chikh Melkaoui ◽  
Benamar Dahmani ◽  
Sihem Zahia Belalia
Keyword(s):  
Zinc Oxide ◽  
Silica Gel ◽  
Water Permeability ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Weight Ratio ◽  
Rejection Rate ◽  
Precipitation Method ◽  
Hybrid Membranes

Matrix hybrid membranes, based on polyvinylidene fluoride (PVDF), poly (N-vinylpyrrolidone) (PVP), silica gel (SG) and zinc oxide (ZnO) were synthesized by phase inversion via immersion precipitation method. The characterization of membrane samples was performed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), optical microscopy, contact angle, porosity, mean pore size and water permeability measurements. The FTIR analysis showed the appearance of new bands attributed to the functional groups of SG and ZnO. The XRD analysis confirmed a modification in the structure of membranes. The prepared membranes were used for the removal of hexavalent chromium (Cr(VI)) from aqueous solution. Membrane filtration experiments show that the water permeability and Cr(VI) rejection ratios increase with increasing the weight ratio ZnO (%)/SG (%). The maximum values of the Cr(VI) rejection rate and water permeability were respectively 85% and 685 L/m2hbar for weight ratios (0.75% of ZnO/0.25% of SG).

scholarly journals Study on Traditional Technology of Nepalese Fried Snack Woh

2014 ◽  
Vol 8 ◽  
pp. 35-39 ◽  
Author(s):  
Bhaskar Mani Adhikari ◽  
Karishma Dangol
Keyword(s):  
Particle Size ◽  
Soybean Oil ◽  
Sunflower Oil ◽  
Green Gram ◽  
Particle Sizes ◽  
Black Gram ◽  
Oil Uptake ◽  
Traditional Technology ◽  
Fried Snack

Woh is a deep oil fried spongy Nepalese indigenous product. This work was done to find out the basics of woh and to prepare best from different formulations using unlike particle size and different frying media. Green gram and black gram in a ratio of 100:0, 50:50, 60:40, and 70:30 were mixed and ground on stone grinder and mixer grinder for different particle sizes. Batter mixed with spices were whipped and deep fried in mustard, soybean and sunflower oil separately at 204 ± 2ºC for 2.5 ± 0.5 minutes. Woh with 60:40 combination having 103 μm particle size fried in soybean oil was found to be nutritious with less oil uptake and less anti nutritional factors.DOI: http://dx.doi.org/10.3126/jfstn.v8i0.11747 J. Food Sci. Technol. Nepal, Vol. 8 (35-39), 2013

scholarly journals The model binary/ternary mixtures for actual EPS solution extracted from the activated sludge in MBR using dead-end membrane filtration cell

2017 ◽  
Vol 77 (4) ◽  
pp. 1015-1026 ◽  
Author(s):  
Shuang Zhao ◽  
Longyue Shi ◽  
Yu Ma ◽  
Zhan Wang
Keyword(s):  
Ternary Mixture ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Extracellular Polymeric Substances ◽  
Binary Solution ◽  
Ternary Mixtures ◽  
Accurate Estimation ◽  
Dead End ◽  
Series Of Experiments ◽  
Specific Cake Resistance

Abstract In order to find a model solution to simulate actual extracellular polymeric substances (EPS) solution in terms of filterability behavior, a series of experiments were conducted in a dead-end unstirred cell with 0.1 μm polyvinylidene fluoride membranes using binary/ternary mixtures consisting of sodium alginate (SA), bovine serum albumin (BSA) and humic acid (HA). Three target parameters (cumulative filtrate volume (CFV), specific cake resistance (αc) and rejection (R)) were compared and the roles of mixture components were investigated. The order of degree of influence on CFV, αc and R in ternary mixture was SA (94.5%, 85.6% and 88.2%, respectively) > BSA (5.2%, 10.3% and 8.0%) > HA (0.3%, 4.1% and 3.8%). Meanwhile, when the composition of ternary mixture was SA/BSA/HA = 285.1/150.1/10.2 mg·L−1, the deviation for CFV, αc and R was 7.65%, 19.6% and 7.27%, respectively, while the corresponding values for the most suitable binary solution (SA/BSA = 140.4/50.35 mg·L−1) were −12%, 1% and 164% respectively. This indicated that the ternary solution demonstrated a more accurate estimation than the binary solution for imitating the filterability of actual EPS solution. Therefore, the ternary mixture could be employed efficiently to replace the actual EPS solution in terms of three target parameters in practice applications.

scholarly journals Electrospun Fibers of Polybutylene Succinate/Graphene Oxide Composite for Syringe-Push Protein Absorption Membrane

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2042
Author(s):  
Nuankanya Sathirapongsasuti ◽  
Anuchan Panaksri ◽  
Sani Boonyagul ◽  
Somchai Chutipongtanate ◽  
Nuttapol Tanadchangsaeng
Keyword(s):  
Graphene Oxide ◽  
Protein Binding ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Binding Capacity ◽  
Low Cost ◽  
Morphological Properties ◽  
Binding Property ◽  
Oxide Composite ◽  
Polybutylene Succinate

The adsorption of proteins on membranes has been used for simple, low-cost, and minimal sample handling of large volume, low protein abundance liquid samples. Syringe-push membrane absorption (SPMA) is an innovative way to process bio-fluid samples by combining a medical syringe and protein-absorbable membrane, which makes SPMA a simple, rapid protein and proteomic analysis method. However, the membrane used for SPMA is only limited to commercially available protein-absorbable membrane options. To raise the method’s efficiency, higher protein binding capacity with a lower back pressure membrane is needed. In this research, we fabricated electrospun polybutylene succinate (PBS) membrane and compared it to electrospun polyvinylidene fluoride (PVDF). Rolling electrospinning (RE) and non-rolling electrospinning (NRE) were employed to synthesize polymer fibers, resulting in the different characteristics of mechanical and morphological properties. Adding graphene oxide (GO) composite does not affect their mechanical properties; however, electrospun PBS membrane can be applied as a filter membrane and has a higher pore area than electrospun PVDF membrane. Albumin solution filtration was performed using all the electrospun filter membranes by the SPMA technique to measure the protein capture efficiency and staining of the protein on the membranes, and these membranes were compared to the commercial filter membranes—PVDF, nitrocellulose, and Whatman no. 1. A combination of rolling electrospinning with graphene oxide composite and PBS resulted in two times more captured protein when compared to commercial membrane filtration and more than sixfold protein binding than non-composite polymer. The protein staining results further confirmed the enhancement of the protein binding property, showing more intense stained color in compositing polymer with GO.

Impact of polymeric membrane filtration of oil sands process water on organic compounds quantification

2014 ◽  
Vol 70 (5) ◽  
pp. 771-779 ◽  
Author(s):  
Ahmed M. A. Moustafa ◽  
Eun-Sik Kim ◽  
Alla Alpatova ◽  
Nian Sun ◽  
Scott Smith ◽  
...  
Keyword(s):  
Oil Sands ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Hydrophobic Interactions ◽  
High Resolution Mass Spectrometry ◽  
Naphthenic Acids ◽  
Polymeric Membrane ◽  
Nylon Membrane ◽  
Quantification Analysis ◽  
The Impact

The interaction between organic fractions in oil sands process-affected water (OSPW) and three polymeric membranes with varying hydrophilicity (nylon, polyvinylidene fluoride and polytetrafluoroethylene) at different pHs was studied to evaluate the impact of filtration on the quantification of acid-extractable fraction (AEF) and naphthenic acids (NAs). Four functional groups predominated in OSPW (amine, phosphoryl, carboxyl and hydroxyl) as indicated by the linear programming method. The nylon membranes were the most hydrophilic and exhibited the lowest AEF removal at pH of 8.7. However, the adsorption of AEF on the membranes increased as the pH of OSPW decreased due to hydrophobic interactions between the membrane surfaces and the protonated molecules. The use of ultra pressure liquid chromatography-high resolution mass spectrometry (UPLC/HRMS) showed insignificant adsorption of NAs on the tested membranes at pH 8.7. However, 26 ± 2.4% adsorption of NAs was observed at pH 5.3 following the protonation of NAs species. For the nylon membrane, excessive carboxylic acids in the commercial NAs caused the formation of negatively charged assisted hydrogen bonds, resulting in increased adsorption at pH 8.2 (25%) as compared to OSPW (0%). The use of membranes for filtration of soluble compounds from complex oily wastewaters before quantification analysis of AEF and NAs should be examined prior to application.

scholarly journals Improving Water Permeability of Hydrophilic PVDF Membrane Prepared via Blending with Organic and Inorganic Additives for Humic Acid Separation

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4099 ◽  
Author(s):  
Nasrul Arahman ◽  
Sri Mulyati ◽  
Afrillia Fahrina ◽  
Syawaliah Muchtar ◽  
Mukramah Yusuf ◽  
...  
Keyword(s):  
Humic Acid ◽  
Water Permeability ◽  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Cross Flow ◽  
Chemical Compositions ◽  
Separation Performance ◽  
Pvdf Membrane ◽  
Cross Flow Filtration

The removal of impurities from water or wastewater by the membrane filtration process has become more reliable due to good hydraulic performance and high permeate quality. The filterability of the membrane can be improved by having a material with a specific pore structure and good hydrophilic properties. This work aims at preparing a polyvinylidene fluoride (PVDF) membrane incorporated with phospholipid in the form of a 2-methacryloyloxyethyl phosphorylcholine, polymeric additive in the form of polyvinylpyrrolidone, and its combination with inorganic nanosilica from a renewable source derived from bagasse. The resulting membrane morphologies were analyzed by using scanning electron microscopy. Furthermore, atomic force microscopy was performed to analyze the membrane surface roughness. The chemical compositions of the resulting membranes were identified using Fourier transform infrared. A lab-scale cross-flow filtration system module was used to evaluate the membrane’s hydraulic and separation performance by the filtration of humic acid (HA) solution as the model contaminant. Results showed that the additives improved the membrane surface hydrophilicity. All modified membranes also showed up to five times higher water permeability than the pristine PVDF, thanks to the improved structure. Additionally, all membrane samples showed HA rejections of 75–90%.

scholarly journals Development of Polyvinylidene Fluoride Membrane by Incorporating Bio-Based Ginger Extract as Additive

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2003
Author(s):  
Afrillia Fahrina ◽  
Nasrul Arahman ◽  
Sri Mulyati ◽  
Sri Aprilia ◽  
Normi Izati Mat Nawi ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Inhibition Zone ◽  
Diffusion Method ◽  
Ginger Extract ◽  
Dimethyl Acetamide ◽  
Antibiotic Property

Biofouling on the membrane surface leads to performance deficiencies in membrane filtration. In this study, the application of ginger extract as a bio-based additive to enhance membrane antibiofouling properties was investigated. The extract was dispersed in a dimethyl acetamide (DMAc) solvent together with polyvinylidene fluoride (PVDF) to enhance biofouling resistance of the resulting membrane due to its antibiotic property. The concentrations of the ginger extract in the dope solution were varied in the range of 0–0.1 wt %. The antibacterial property of the resulting membranes was assessed using the Kirby Bauer disc diffusion method. The results show an inhibition zone formed around the PVDF/ginger membrane against Escherichia coli and Staphylococcus aureus demonstrating the efficacy of the residual ginger extract in the membrane matrix to impose the antibiofouling property. The addition of the ginger extract also enhanced the hydrophilicity in the membrane surface by lowering the contact angle from 93° to 85°, which was in good agreement with the increase in the pure water flux of up to 62%.

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