Recycling of precious materials by modified electrospun membranes

Zeytuncu-Gökoğlu, Bihter; Taşdemir, Reyhan Şengür; Tanc, Beril; Aktaş, Serdar; Koyuncu, İsmail

doi:10.5004/dwt.2021.26748

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…PAN had characteristic peaks at 2239 cm −1 and 2946 cm −1 that were associated with C–N and CH 2 stretching vibrations, which are distinctive chemical groups in PAN 41 . Functionalization of nanofibers mats with keratin lead to appearing peak at 1458 cm −1 is attributable to amide II, which has been linked to keratin N–H bending and C–H stretching 42 . Otherwise, the ATR-FTIR peaks at 550 cm −1 for PAN/0.025% K and PAN/0.05% K are associated with S–S of the disulfid bond of keratin 43 .…”

Section: Resultsmentioning

confidence: 99%

Electrospun non-wovens potential wound dressing material based on polyacrylonitrile/chicken feathers keratin nanofiber

Serag

El-Aziz

El‐Maghraby

et al. 2022

Sci Rep

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Electrospinning nanofibers have a tremendous interest in biomedical applications such as tissue engineering, drug administration, and wound healing because of their ability to replicate and restore the function of the natural extracellular matrix found in tissues. The study’s highlight is the electrospinning preparation and characterization of polyacrylonitrile with chicken feather keratin as an additive. In this study, keratin was extracted from chicken feather waste using an environmentally friendly method and used to reinforce polymeric nanofiber mats. Scanning electron microscopy, energy dispersive spectroscopy, and transmission electron microscopy were used to examine the morphology and the structure of the prepared nanofiber mats. The effect of keratin on the porosity and the tensile strength of reinforcing nanofibers is investigated. The porosity ratio of the nanofiber mats goes up from 24.52 ± 2.12 for blank polyacrylonitrile (PAN (NF)) to 90.89 ± 1.91% for polyacrylonitrile nanofiber with 0.05 wt% keratin (PAN/0.05% K). Furthermore, keratin reinforcement improves the nanofiber's mechanical properties, which are important for wound dressing application, as well as its antibacterial activity without causing hemolysis (less than 2%). The best antibacterial activities were observed against Pseudomonas aeruginosa (30 ± 0.17 mm inhibition zone) and Staphylococcus aureus (29 ± 0.31 mm inhibition zone) for PAN/0.05% K sample, according to the antibacterial test. This research has a good potential to broaden the use of feather keratin-based nanofibers in wound healing.

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Section: Resultsmentioning

confidence: 99%

Electrospun non-wovens potential wound dressing material based on polyacrylonitrile/chicken feathers keratin nanofiber

Serag

El-Aziz

El‐Maghraby

et al. 2022

Sci Rep

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“…The higher selectivity toward Au(III) was attributed to the difference in electronegativity of the two precious metals. 27 Moreover, lignosulfonate-activated carbon EFs (LACF) were further activated with CO 2 to recover Cu(II) and Au(III) from aqueous solutions. 28 One of the most interesting applications requiring the use of highly effective adsorbents is the hydrometallurgical treatment of spent catalysts or Waste of Electric and Electronic Equipment (WEEE), in which selective leaching processes are applied to dissolve precious metals from the waste materials.…”

Section: Introductionmentioning

confidence: 99%

Design and Production of Functionalized Electrospun Fibers for Palladium Recovery

Di Bonito,

Kyriacou,

Di Colandrea

et al. 2024

ACS Appl. Polym. Mater.

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Adsorption stands out as a leading wastewater treatment method for ion removal or recovery. Polymeric fibers, notably electrospun ones, are gaining prominence due to their high capacity and easy recovery. Electrospinning offers a cost-effective means to produce fibers with a large surface area and high adsorption capacity. These fibers can be further functionalized with chemical substances acting as specific ligands for metal ions, bolstering their adsorption capabilities. In this study, dithioester-functionalized electrospun fibers were synthesized as an alternative to conventional sorbents for palladium recovery from acidic chloride solutions, similar to those used in hydrometallurgical processes for platinum group metal recovery (Pd, Pt, Rh···) from spent catalysts. Fibers with identical chemical composition but varying morphology were examined to assess their impact on palladium adsorption efficiency (i.e., beads-free and beads-on-string morphologies). Experimental investigations involved model solutions with varying palladium concentration, temperature, acidity (adjusted with HCl content), and salinity (adjusted with NaCl), utilizing both pure and dithioester-functionalized fibers. Experimental results demonstrate enhanced adsorption efficiency at lower temperatures and in 0.1 M HCl, with a negligible influence from solution salinity. Moreover, both pure polymeric and dithioester-functionalized electrospun fibers exhibit highly efficient palladium recovery. Furthermore, under optimal conditions, starting from an 80 mg/L palladium solution, a 95% recovery of palladium can be achieved with a sorbent dosage below 4 g/L of functionalized electrospun fibers. The adsorption data are well described by the Langmuir isotherm model for the pure polymeric fibers. At the same time, the contribution of dithioesters has been separately accounted for to describe the behavior of functionalized electrospun fibers. Thermal recovery of palladium from the spent sorbents has also been investigated.

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A novel PAN/GO electrospun nanocomposite fibrous membranes with rich amino groups for highly efficient adsorption of Au(III)

Yang

et al. 2023

Diamond and Related Materials

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Recycling of precious materials by modified electrospun membranes

Cited by 5 publications

References 23 publications

Electrospun non-wovens potential wound dressing material based on polyacrylonitrile/chicken feathers keratin nanofiber

Electrospun non-wovens potential wound dressing material based on polyacrylonitrile/chicken feathers keratin nanofiber

Design and Production of Functionalized Electrospun Fibers for Palladium Recovery

A novel PAN/GO electrospun nanocomposite fibrous membranes with rich amino groups for highly efficient adsorption of Au(III)

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