Preparation of sodium alginate/polyvinyl alcohol composite nanofiber membranes for adsorption of dyes

In this research, electrospinning was used to prepare sodium alginate (SA)/polyvinyl alcohol (PVA) composite nanofiber membranes. Effects of electrospinning parameters on the morphology and fiber diameter were investigated, and an orthogonal design was chosen to optimize the parameters. The optimized nanofiber membranes were applied as an adsorbent for the removal of methylene blue (MB), basic fuchsin (BF), and methyl orange (MO). Kinetic and isotherm of adsorption and effects of different experimental conditions such as pH, contact time, and initial dye concentration on adsorption capacity were investigated. It was found that the optimum parameters for the nanofiber membranes were SA/PVA blend ratios (3:7), electric field strength (20 kV), flow rate (0.05 mL/h), and distance (12.5 cm) between the syringe needle and collector, and the mean fiber diameter of the optimized membranes was 99.58 nm. The adsorption of nanofiber membranes was well described by the pseudo-second-order adsorption kinetic model and the Langmuir model, indicating that the adsorption mechanism was chemisorption by a monolayer. Based on the Langmuir model, the adsorption capacities for MB, BF, and MO were 9.25 mg/g, 9.02 mg/g, and 7.35 mg/g, respectively.

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Mass-Production and Characterizations of Polyvinyl Alcohol/Sodium Alginate/Graphene Porous Nanofiber Membranes Using Needleless Dynamic Linear Electrospinning

Polymers ◽

10.3390/polym10101167 ◽

2018 ◽

Vol 10 (10) ◽

pp. 1167 ◽

Cited By ~ 10

Author(s):

Ting-Ting Li ◽

Mengxue Yan ◽

Wenting Xu ◽

Bing-Chiuan Shiu ◽

Ching-Wen Lou ◽

...

Keyword(s):

Thermal Stability ◽

Polyvinyl Alcohol ◽

Sodium Alginate ◽

Mass Production ◽

Large Scale ◽

Copper Wire ◽

High Yield ◽

Scale Preparation ◽

Nanofiber Membranes ◽

Porous Nanofiber

The aim of this study was to investigate the feasibility of large-scale preparation of porous polyvinyl alcohol/sodium alginate/graphene (Gr) (Gr-AP) nanofiber membranes using a copper wire needleless dynamic linear electrode electrospinning machine. Furthermore, the effects of Gr concentrations (0, 0.0375, 0.075, 0.25, 0.5, and 0.75 wt.%) on the morphology, electrical, hydrophilicity and thermal properties were evaluated. Results indicate that the dynamic linear electrospun Gr-AP membranes have a high yield of 1.25 g/h and are composed of porous finer nanofibers with a diameter of 141 ± 31 nm. Gr improved the morphology, homogeneity, hydrophobicity and thermal stability of Gr-AP nanofiber membranes. The critical conductive threshold is 0.075 wt.% for Gr, which provides the nanofiber membranes with an even distribution of diameter, an optimal conductivity, good hydrophilicity, appropriate specific surface area and optimal thermal stability. Therefore, needleless dynamic linear electrospinning is beneficial to produce high quality Gr-AP porous nanofiber membranes, and the optimal parameters can be used in artificial nerve conduits and serve as a valuable reference for mass production of nanofiber membranes.

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Treatment of succinonitrile wastewater by immobilized high efficiency microorganism strains

Water Science & Technology ◽

10.2166/wst.2008.693 ◽

2008 ◽

Vol 58 (4) ◽

pp. 911-918 ◽

Cited By ~ 5

Author(s):

X. F. Zhou ◽

Y. L. Zhang ◽

D. Q. Xu ◽

W. H. Cao ◽

C. M. Dai ◽

...

Keyword(s):

Polyvinyl Alcohol ◽

Sodium Alginate ◽

High Efficiency ◽

Treatment Plant ◽

Optimal Growth ◽

Sole Source ◽

Growth Conditions ◽

Experimental Conditions ◽

J 13 ◽

Rotary Speed

Using succinonitrile as a sole source of carbon and nitrogen, two bacterium strains named as J-1-3 and J-13-1 were isolated and screened out from the treatment facilities of Shanghai petrochemical wastewater treatment plant treating acrylic fiber production wastewater. The optimal growth conditions of the two strains in the degradation of succinonitrile with varied initial concentrations were determined through flask tests as follows: temperature 30°C, shaker rotary speed of 250 r/min, inoculum percentage 0.1%, and initial pH 6. Results indicate that the two strains, especially J-13-1, exhibited a high efficiency for succinonitrile degradation. Thereafter, the bacterium strains were immobilized separately by sodium alginate and polyvinyl alcohol 1750±50, and applied to succinonitrile degradation again. Results show that in a very broad range of the initial succinonitrile concentration, i.e., 30–5,000 mg/L, the sodium alginate immobilized grains could degrade more than 80% of succinonitrile after 24 h under the experimental conditions of 30°C, pH 6.5, and shaker rotary speed of 250 r/min. However, the polyvinyl alcohol immobilized grains tended to inflate and break down due to a weak mechanical strength.

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Morphological, Thermal, and Mechanical Properties of Electrospun Recycled Poly(ethylene terephthalate)/Graphene Oxide Composite Nanofiber Membranes

ACS Omega ◽

10.1021/acsomega.1c02578 ◽

2021 ◽

Author(s):

Koena Selatile ◽

Suprakas Sinha Ray ◽

Vincent Ojijo ◽

Rotimi Emmanuel Sadiku

Keyword(s):

Mechanical Properties ◽

Graphene Oxide ◽

Ethylene Terephthalate ◽

Thermal And Mechanical Properties ◽

Oxide Composite ◽

Poly Ethylene Terephthalate ◽

Composite Nanofiber ◽

Nanofiber Membranes ◽

Poly Ethylene

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Removal of methylene blue and Lead (II) via PVA/SA double cross-linked network gel beads loaded Fe3O4@KHA nanoparticles

New Journal of Chemistry ◽

10.1039/d1nj00006c ◽

2021 ◽

Author(s):

Niu Yuhua ◽

Han Xingxing ◽

Song Jie ◽

Huang Liangxian

Keyword(s):

Methylene Blue ◽

Polyvinyl Alcohol ◽

Sodium Alginate ◽

Potassium Humate ◽

Gel Beads ◽

Ferroferric Oxide ◽

Double Cross

Novel magnetic gel beads were successfully fabricated via polyvinyl alcohol (PVA) and sodium alginate (SA) double cross-linked network loaded ferroferric oxide@potassium humate (Fe3O4@KHA) nanoparticles. PVA/SA/Fe3O4@KHA gel beads were found to...

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