Electrospinning of Nafion and polyvinyl alcohol into nanofiber membranes: A facile approach to fabricate functional adsorbent for heavy metals

2014 ◽  
Vol 457 ◽  
pp. 236-243 ◽  
Author(s):  
Dilip K. Sharma ◽  
Fengting Li ◽  
Yi-nan Wu
Keyword(s):  
Heavy Metals ◽  
Polyvinyl Alcohol ◽  
Nanofiber Membranes

Electrospinning of polyvinyl alcohol into crosslinked nanofibers: An approach to fabricate functional adsorbent for heavy metals

2019 ◽  
Vol 378 ◽  
pp. 120751 ◽  
Author(s):  
Huafeng Tian ◽  
Li Yuan ◽  
Jianguo Wang ◽  
Hao Wu ◽  
Hailiang Wang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Polyvinyl Alcohol

scholarly journals Fabrication, Characterization, and Antibacterial Properties of Electrospun Membrane Composed of Gum Karaya, Polyvinyl Alcohol, and Silver Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Vinod Vellora Thekkae Padil ◽  
Nhung H. A. Nguyen ◽  
Alena Ševců ◽  
Miroslav Černík
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Polyvinyl Alcohol ◽  
Food Packaging ◽  
Chemical Reduction ◽  
Antibacterial Properties ◽  
Hydroxyl Groups ◽  
Ag Nps ◽  
Gum Karaya ◽  
Nanofiber Membranes

Gum karaya (GK), a natural hydrocolloid, was mixed with polyvinyl alcohol (PVA) at different weight ratios and electrospun to produce PVA/GK nanofibers. An 80 : 20 PVA/GK ratio produced the most suitable nanofiber for further testing. Silver nanoparticles (Ag-NPs) were synthesised through chemical reduction of AgNO3(at different concentrations) in the PVA/GK solution, the GK hydroxyl groups being oxidised to carbonyl groups, and Ag+cations reduced to metallic Ag-NPs. These PVA/GK/Ag solutions were then electrospun to produce nanofiber membranes containing Ag-NPs (Ag-MEMs). Membrane morphology and other characteristics were analysed using scanning electron microscopy coupled with energy dispersive X-ray analysis, transmission electron microscopy, and UV-Vis and ATR-FTIR spectroscopy. The antibacterial activity of the Ag-NP solution and Ag-MEM was then investigated against Gram-negativeEscherichia coliandPseudomonas aeruginosaand Gram-positiveStaphylococcus aureus. Our results show that electrospun nanofiber membranes based on natural hydrocolloid, synthetic polymer, and Ag-NPs have many potential uses in medical applications, food packaging, and water treatment.

Sound absorption property of PVA/PEO/GO nanofiber membrane and non-woven composite material

2019 ◽  
Vol 50 (4) ◽  
pp. 512-525
Author(s):  
Huan Liu ◽  
Baoqi Zuo
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Polyethylene Oxide ◽  
Sound Absorption ◽  
Woven Fabric ◽  
Nanofiber Membrane ◽  
Absorption Properties ◽  
Blend Films ◽  
Absorption Performance ◽  
Nanofiber Membranes

Blend films based on polyvinyl alcohol/polyethylene oxide (70/30 wt%) undoped and doped with different concentration of graphene oxide were prepared by spiral vane electrospinning. Characteristic properties of the blend films were investigated by using X-ray diffraction and scanning electron microscopy. The sound absorption performance of the compositions (nanofiber membranes and needle punched non-woven fabric) was tested by an impedance tube. The sound absorption performance of non-woven fabric has greatly improved after combining with thin nanofiber membranes. With addition of graphene oxide, the fibers were intertwined in a loop and form a network, the areal density and surface roughness of the nanofiber membrane are reduced. Composites containing polyvinyl alcohol/polyethylene oxide nanofiber membranes and composites containing polyvinyl alcohol/polyethylene oxide/graphene oxide nanofiber membranes exhibited different sound absorption properties in different frequency bands. When the fiber coefficient of variation was small, the average sound absorption coefficient of the composite material was high. However, composites containing both polyvinyl alcohol/polyethylene oxide and polyvinyl alcohol/polyethylene oxide/graphene oxide nanofiber membranes had similar sound absorption properties, and the average sound absorption coefficient was greater than that of polyvinyl alcohol/polyethylene oxide composites.

scholarly journals Application of biosurfactants for heavy netals leaching from immobilized activated sludge / Zastosowanie biosurfaktantów do wymywania metali ciężkich z immobilizowanego osadu czynnego

2015 ◽  
Vol 41 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Małgorzata Kuczajowska-Zadrożna ◽  
Urszula Filipkowska ◽  
Tomasz Jóźwiak
Keyword(s):  
Heavy Metals ◽  
Critical Micelle Concentration ◽  
Polyvinyl Alcohol ◽  
Activated Sludge ◽  
Sodium Alginate ◽  
Ph Value ◽  
The Other ◽  
The Impact ◽  
Cadmium Zinc

Abstract This study was undertaken to determine the effectiveness of biosurfactants - saponin, tannin and rhamnolipids JBR 515 and 425, for the removal of cadmium, zinc and copper from activated sludge immobilized in 1.5% sodium alginate with 0.5% polyvinyl alcohol. We also established the impact of pH value on biosorbent regeneration with the analyzed biosurfactants and determined the critical micelle concentration (CMC) in solutions containing the biosorbent and biosurfactant and in exact samples with heavy metals. Saponin exhibited the highest effectiveness of metals leaching at pH 1-5, and rhamnosides at pH 5-6. In addition, the study demonstrated a significant effect of the ratio of biosorbent mass to washing agent volume (m/V) on the effectiveness of metals leaching. Of the biosurfactants analyzed, saponin was ca. 100% effective in leaching zinc and copper. The effectiveness of the other biosurfactants was lower and depended on the metal being leached

scholarly journals Post-electrospinning crosslinking of guar/polyvinyl alcohol membrane

2016 ◽  
Vol 20 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Jingjing Shi ◽  
Enlong Yang
Keyword(s):  
Heat Treatment ◽  
Citric Acid ◽  
Polyvinyl Alcohol ◽  
Guar Gum ◽  
Weight Ratio ◽  
Average Diameter ◽  
Alcohol Solution ◽  
Electrospun Nanofiber ◽  
Ft Ir ◽  
Nanofiber Membranes

College of Material and Textile Engineering, Jiaxing University, Jiaxing, China The present study reports post-electrospinning crosslinking of guar/polyvinyl alcohol (PVA)/citric acid nanofiber membranes by heat treatment. Porous, interconnected nonwoven nanofiber membranes (average diameter 194?23 nm) were electrospun from a homogeneous blend of 1wt% guar gum and 8wt% polyvinyl alcohol solution (3:7 weight ratio) containing 5 wt% (by the total weight of the solution) citric acid. The electrospun nanofiber membranes were then cured at 140 oC for 2 h. The crosslinked nanofiber membranes were insoluble in water, while the non-crosslinked membranes dissolved instantaneously. FT-IR spectrum investigates that crosslinking of guar/PVA occurred through esterfication reaction during heat treatment.

Hexavalent chromium removal by using synthesis of polyaniline and polyvinyl alcohol

2016 ◽  
Vol 74 (10) ◽  
pp. 2305-2313 ◽  
Author(s):  
Majid Riahi Samani ◽  
Parisa Ebrahimbabaie ◽  
Hamed Vafaei Molamahmood
Keyword(s):  
Heavy Metals ◽  
Polyvinyl Alcohol ◽  
Hexavalent Chromium ◽  
Removal Efficiency ◽  
Chromium Concentration ◽  
Chromium Removal ◽  
Chromium Vi ◽  
Pani Composite ◽  
Stirring Time ◽  
Textile Finishing

Over the past few years, heavy metals have been proved to be one of the most important contaminants in industrial wastewater. Chromium is one of these heavy metals, which is being utilized in several industries such as textile, finishing and leather industries. Since hexavalent chromium is highly toxic to human health, removal of it from the wastewater is essential for human safety. One of the techniques for removing chromium (VI) is the use of different adsorbents such as polyaniline. In this study, composites of polyaniline (PANi) were synthesized with various amounts of polyvinyl alcohol (PVA). The results showed that PANi/PVA removed around 76% of chromium at a pH of 6.5; the PVA has altered the morphology of the composites and increased the removal efficiency. Additionally, synthesis of 20 mg/L of PVA by PANi composite showed the best removal efficiency, and the optimal stirring time was calculated as 30 minutes. Moreover, the chromium removal efficiency was increased by decreasing the pH, initial chromium concentration and increasing stirring time.

scholarly journals Fabrication and application of coaxial polyvinyl alcohol/chitosan nanofiber membranes

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 1004-1014 ◽  
Author(s):  
Ting-Yun Kuo ◽  
Cuei-Fang Jhang ◽  
Che-Min Lin ◽  
Tzu-Yang Hsien ◽  
Hsyue-Jen Hsieh
Keyword(s):  
Drug Release ◽  
Polyvinyl Alcohol ◽  
Gum Arabic ◽  
Release Time ◽  
Core Shell ◽  
The Core ◽  
Chitosan Nanofiber ◽  
Application Potential ◽  
Nanofiber Membranes ◽  
Model Drug

AbstractIt is difficult to fabricate chitosan-wrapped coaxial nanofibers, because highly viscous chitosan solutions might hinder the manufacturing process. To overcome this difficulty, our newly developed method, which included the addition of a small amount of gum arabic, was utilized to prepare much less viscous chitosan solutions. In this way, coaxial polyvinyl alcohol (PVA)/chitosan (as core/shell) nanofiber membranes were fabricated successfully by coaxial electrospinning. The core/shell structures were confirmed by TEM, and the existence of PVA and chitosan was also verified using FT-IR and TGA. The tensile strength of the nanofiber membranes was increased from 0.6-0.7 MPa to 0.8-0.9 MPa after being crosslinked with glutaraldehyde. The application potential of the PVA/chitosan nanofiber membranes was tested in drug release experiments by loading the core (PVA) with theophylline as a model drug. The use of the coaxial PVA/chitosan nanofiber membranes in drug release extended the release time of theophylline from 5 minutes to 24 hours. Further, the release mechanisms could be described by the Korsmeyer-Peppas model. In summary, by combining the advantages of PVA and chitosan (good mechanical strength and good biocompatibility respectively), the coaxial PVA/chitosan nanofiber membranes are potential biomaterials for various biomedical applications.

scholarly journals Preparation of Electrospun Polyvinyl Alcohol/Nanocellulose Composite Film and Evaluation of Its Biomedical Performance

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 223
Author(s):  
Xinbin Ji ◽  
Jing Guo ◽  
Fucheng Guan ◽  
Yuanfa Liu ◽  
Qiang Yang ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Raw Materials ◽  
Average Diameter ◽  
Hydroxyl Group ◽  
Microscopic Appearance ◽  
Artificial Blood ◽  
Maximum Value ◽  
Liquid Absorption ◽  
Free Hydroxyl ◽  
Nanofiber Membranes

Using polyvinyl alcohol (PVA) and nanocellulose (NC) as raw materials, PVA/NC nanofiber membranes were prepared by electrospinning. The hydrogen bonding, crystalline properties and microscopic appearance of PVA/NC membranes with different NC contents were characterized. The mechanical properties, liquid absorption and cytotoxicity of the nanofiber membrane were evaluated. The results show that the free hydroxyl group of the PVA/NC nanofiber membranes have a maximum value of 9% at a mass fraction of 6% NC. The crystallinity of the PVA/NC nanofiber membranes and the average diameter of the nanofibers decreased and then increased as the NC content increased, with a minimum value of 38.23% and 272.03 nm, respectively, at 6% NC content. At this time, the contact angle was the smallest. The maximum strength of the PVA/NC nanofiber membranes is 75.8% higher than that of the PVA membrane at 2% NC content. With increasing NC content, the absorption of water, PBS sustained-release suspensions and artificial blood by PVA/NC nanofiber membranes increases. Cytotoxicity tests have shown that PVA/NC nanofiber membranes are non-toxic, have good cytocompatibility and are expected to be used in the field of medical dressings.

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