Sorption of d-metal cations by keratin from aqueous solutions

Никифорова, Т. Е.; Козлов, В. А.; Islyaikin, M. K.

doi:10.1016/j.jece.2019.103417

Cited by 25 publications

(19 citation statements)

References 28 publications

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“…All the E values were larger than 16 KJ/mol, suggesting that the chemical interactions played an important role in the Cu 2+ adsorption process onto the wool keratin modified Fe 3 O 4 powders [ 74 ]. However, the results were not agreement with the electrostatic interaction [ 6 ] or ion exchange [ 7 ] reactions.…”

Section: Resultsmentioning

confidence: 95%

“…In particular, wool keratins possess a large number of functional groups, including sulfhydryl (–SH), amide (–CONH 2 ), carboxyl (–COOH), and hydroxyl (–OH) [ 5 ], and these groups can interact strongly with heavy metal ions by valence forces, resulting in higher adsorption capacity than other keratinous materials [ 6 ]. It has been demonstrated that the adsorption sites on wool keratins are primarily focused on the groups of amino and carboxyl and the cleavage of disulfide bonds [ 7 ]. In acidic medium, the surface of wool keratins is positive charged owing to the protonation of amino groups and the dissociation of carboxyl groups.…”

Section: Introductionmentioning

confidence: 99%

“…In acidic medium, the surface of wool keratins is positive charged owing to the protonation of amino groups and the dissociation of carboxyl groups. Thus, carboxyl groups can react with metal ions to form metal/wool complex [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions

Zhang

Guo

et al. 2021

Nanomaterials

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The treatment of wastewater containing heavy metals and the utilization of wool waste are very important for the sustainable development of textile mills. In this study, the wool keratin modified magnetite (Fe3O4) powders were fabricated by using wool waste via a co-precipitation technique for removal of Cu2+ ions from aqueous solutions. The morphology, chemical compositions, crystal structure, microstructure, magnetism properties, organic content, and specific surface area of as-fabricated powders were systematically characterized by various techniques including field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), thermogravimetric (TG) analysis, and Brunauer–Emmett–Teller (BET) surface area analyzer. The effects of experimental parameters such as the volume of wool keratin hydrolysate, the dosage of powder, the initial Cu2+ ion concentration, and the pH value of solution on the adsorption capacity of Cu2+ ions by the powders were examined. The experimental results indicated that the Cu2+ ion adsorption performance of the wool keratin modified Fe3O4 powders exhibited much better than that of the chitosan modified ones with a maximum Cu2+ adsorption capacity of 27.4 mg/g under favorable conditions (0.05 g powders; 50 mL of 40 mg/L CuSO4; pH 5; temperature 293 K). The high adsorption capacity towards Cu2+ ions on the wool keratin modified Fe3O4 powders was primarily because of the strong surface complexation of –COOH and –NH2 functional groups of wool keratins with Cu2+ ions. The Cu2+ ion adsorption process on the wool keratin modified Fe3O4 powders followed the Temkin adsorption isotherm model and the intraparticle diffusion and pseudo-second-order adsorption kinetic models. After Cu2+ ion removal, the wool keratin modified Fe3O4 powders were easily separated using a magnet from aqueous solution and efficiently regenerated using 0.5 M ethylene diamine tetraacetic acid (EDTA)-H2SO4 eluting. The wool keratin modified Fe3O4 powders possessed good regenerative performance after five cycles. This study provided a feasible way to utilize waste wool textiles for preparing magnetic biomass-based adsorbents for the removal of heavy metal ions from aqueous solutions.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions

Zhang

Guo

et al. 2021

Nanomaterials

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“…3b shows the X-ray diffraction patterns of damaged hair as well as KRS, TGRS, and TG-KRS. The higher the crystallinity is, the greater the percentage of the crystalline region in the entire fiber [20]. Because of the dense structure and high density of the crystalline zone, there are more strong chemical bonds between the molecules, which results in improved tensile strength, toughness and stability of the fiber.…”

Section: Structural Characterization Of Damaged Hairs Before and Aftementioning

confidence: 99%

Repair of damaged hair protein fiber by jointly using transglutaminase and keratin

Li¹,

Xiao²

2021

ScienceAsia

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This study focuses on the repair of damaged hair with the joint use of transglutaminase (TG enzyme) and keratin. We first prepared a TG-keratin repair solution with reasonable wool keratin and TG enzyme concentration, and used the soaking process to repair the damaged hair so as to modify protein fibers. We, then, measured the alkali solubility, fracture stress and strain, and swelling rate of the hair samples, before and after the treatment. The results showed that after treatment, samples' alkali solubility reduced from 16.14% to 4.92%, fracture stress increased from 0.832 N to 1.668 N, fracture strain arose from 8.81 mm to 10.17 mm, and swelling rate drops from 38.34% to 2.34%. Both Fourier transform infrared and X-ray diffraction spectroscopies further indicated that combined treatment with keratin and TG enzyme had significant repair effect on the damaged sites, where proteins were exposed with more amide bonds, higher crystallinity, increased percentage of crystalline area over the entire fiber area, and strengthened crosslink activities. Observation under both scanning electron microscope and atomic force microscope revealed smoother surface and fewer warped scales on the surface of hairs after combined treatment with keratin and TG enzyme. To our best knowledge, this is the first application of enzyme technology in damaged hair repair. It opens up a new research direction for green, environmentally friendly, and efficient biological hair care and will play a pivotal role in the application of various protein-based materials.

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“…Taking into account the expected value of such fragments frequency (50 per g of wool), Cu (II) uptake associated with the carboxylic residues can reach 150-300 µmoles/g of wool. [22] Determination of adsorption isotherm model is done to know the process of adsorption of the iron metal ion by duck adsorbent modification with NaOH. The adsorption isotherm model used to describe the adsorption process on the solid surface with Langmuir isotherms.…”

Section: Consentration Naoh (%)mentioning

confidence: 99%

Study of Duck Feather Modification using NaOH to Removal Iron in Acid Mine Drainage (AMD)

2020

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Study of duck feather modification using NaOH to removal iron in acid mine drainage (AMD) has been done. The objective of this study was to determine adsorption capacity. Modification duck feather that 2 g of duck powder was dissolved in 25 mL NaOH with a concentration of 1.00; 1.25; 1.50; 1.75; 2.00; and 2.25 % (v/v), then placed on hotplate stirrer at 50°C and stirred for 24 hours. The results showed that adsorption capacity of Fe by adsorbent of duck feather modification using NaOH optimum at concentration 1.50% and adsorption capacity before & after activation were 36.231 mg/g and 68.493 mg/g and potential to be used as an adsorbent to removal of Fe in acid mine drainage at coal mining.

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Sorption of d-metal cations by keratin from aqueous solutions

Cited by 25 publications

References 28 publications

Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions

Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions

Repair of damaged hair protein fiber by jointly using transglutaminase and keratin

Study of Duck Feather Modification using NaOH to Removal Iron in Acid Mine Drainage (AMD)

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