Electrospun alginate nanofibres as potential bio-sorption agent of heavy metals in water treatment

Mokhena, Teboho Clement; Jacobs, Nokwindla Valencia; Luyt, A. S.

doi:10.3144/expresspolymlett.2017.63

Cited by 37 publications

(16 citation statements)

References 24 publications

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“…At temperature between 200 and 500 • C, the glycosidic bonds were destroyed which corresponds to a weight loss of 47.76 % [43]. The third loss of mass (16.71%) could be attributed to the formation of CaCO 3 [44]. Finally, the loss of mass of 8% corresponded to the decomposition of CaCO 3 which begins at 600 • C. Beyond 700 • C, only quicklime remained as the residue of the decomposition of CaCO 3 , representing 14.75% of the initial mass of alginate.…”

Section: Characterization Of the Tested Adsorbentsmentioning

confidence: 99%

Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

et al. 2019

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In the present study, new adsorbent beads of alginate (A)/maghemite nanoparticles (γ-Fe2O3)/functionalized multiwalled carbon nanotubes (f-CNT) were prepared and characterized by several techniques, e.g., N2 adsorption-desorption isotherms, Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA/DTG), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM) and further tested for the adsorption of the dye methylene blue (MB) from water. The beads (A/γ-Fe2O3/f-CNT) presented a relatively low BET specific surface area value of 59 m2g−1. The magnetization saturation values of A/γ-Fe2O3/f-CNT beads determined at 295 K was equal to 27.16 emu g−1, indicating a magnetic character. The time needed to attain the equilibrium of MB adsorption onto the beads was estimated within 48 h. Thus, several kinetic and isotherm equation models were used to fit the kinetic and equilibrium experimental results. The number of adsorbed MB molecules per active site, the anchorage number, the receptor sites density, the adsorbed quantity at saturation, the concentration at half saturation and the molar adsorption energy were quantified using the monolayer model. The calculated negative ΔG0 and positive ΔH0 values suggested the spontaneous and endothermic nature of the adsorption process. In addition, A/γ-Fe2O3/f-CNT composites can be used at least for six times maintaining their significant adsorptive performance and could be easily separated by using a magnet from water after treatment.

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Section: Characterization Of the Tested Adsorbentsmentioning

confidence: 99%

Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

et al. 2019

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“…In addition, the lack of chain entanglements, gelation at low concentration (i.e., below the formation of entanglements), and high surface tension also contribute to this limited spinnability [26]. Numerous researchers have been working on enhancing the spinnability of alginate through methods such as blending with hydrosoluble polymers, developing a co-solvent system, and modifying the alginate [25,[27][28][29][30] ( Table 1).…”

Section: Electrospinnability Of Alginatementioning

confidence: 99%

“…The use of hydrosoluble polymers (e.g., polyvinyl alcohol (PVA), polyethylene oxide (PEO), etc.) as carrier materials to facilitate alginate spinnability has been the most convenient process to fabricate bead-free fibers [12,25,[27][28][29][31][32][33]. It was reported that the carrier polymers coordinate with the alginate polymer through hydrogen bonding, thereby reducing the strong intra-and inter-molecular network between the alginate chains.…”

Section: Hydrosoluble Polymersmentioning

confidence: 99%

“…Another suitable route for the electrospinning alginate involves the use of the co-solvent system and surfactant with the aim of increasing the content of alginate in the electrospinnable blend [28,[35][36][37][38][39][40][41]. The presence of these components reduces the solution surface tension, as well as the conductivity and rigidity of the alginate, thereby resulting in bead-free fibers.…”

Section: Co-solvent/surfactant and Carrier Polymersmentioning

confidence: 99%

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Electrospun Alginate Nanofibers Toward Various Applications: A Review

et al. 2020

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Alginate has been a material of choice for a spectrum of applications, ranging from metal adsorption to wound dressing. Electrospinning has added a new dimension to polymeric materials, including alginate, which can be processed to their nanosize levels in order to afford unique nanostructured materials with fascinating properties. The resulting nanostructured materials often feature high porosity, stability, permeability, and a large surface-to-volume ratio. In the present review, recent trends on electrospun alginate nanofibers from over the past 10 years toward advanced applications are discussed. The application of electrospun alginate nanofibers in various fields such as bioremediation, scaffolds for skin tissue engineering, drug delivery, and sensors are also elucidated.

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“…It is considered a feasible technology to produce polymer fibers with nano‐size diameter, due to the low costs and simple setup. The technology also provides nanofibers for a broad range of industrial applications in the fields of filtration, composites, medical applications, energy generation and storage, etc. The major challenge of mass‐producing nanofibers is devising high‐throughput electrospinning methods, since single capillary (needle) electrospinning has very low productivity .…”

Section: Introductionmentioning

confidence: 99%

In Situ Viscosity‐Controlled Electrospinning with a Low Threshold Voltage

Kara

Molnár

2019

Macro Materials & Eng

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In the present study, a novel electrospinning method is proposed,where jet formation is aided by shearing the solution in situ. With a generalpolymer solution, viscosity decreases by shearing, that is, the solution isshear‐thinning. Poly(ethylene‐oxide) is used as a model polymer andthe effects of rotation speed, solution concentration, and gap size (the widthof the annular orifice) on the process and the morphology of the obtainedfibers are investigated. It is found that the threshold voltage for generatingmultiple jets decreased from 35 to 12 kV when rotation speed is higher than60 rpm (or shear rate more than 310 s−1). Additionally, the results show thatfiber diameter increases as the concentration of the solution increases. Thechi‐square two‐sample test is used to compare the distribution of fibersproduced by the capillary method and the novel electrospinning process. Inthe authors' method, the viscosity of the solution can be changed by applyingmechanical forces on it during the electrospinning process, which results inthe initiation of the electrospinning jet at a low threshold voltage. It is alsofound that gap size has a similar effect on fiber diameter as needle diameter in classical electrospinning.

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Electrospun alginate nanofibres as potential bio-sorption agent of heavy metals in water treatment

Cited by 37 publications

References 24 publications

Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

Electrospun Alginate Nanofibers Toward Various Applications: A Review

In Situ Viscosity‐Controlled Electrospinning with a Low Threshold Voltage

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