Peculiarities of Sorption of Copper(II) Ions by Modified Wool Keratin

Никифорова, Т. Е.; Козлов, В. А.; Sionikhina, A. N.

doi:10.1134/s2070205119050186

Cited by 12 publications

(10 citation statements)

References 22 publications

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“…As shown, the Cu(II) at a sufficient concentration very readily forms complexes with the ligands provided by keratin, immediately on the surface of the fibre [32]. Since the initial content of the carboxyl groups in keratin is higher than that of the amino groups [18], some parts of the complex molecule have to be ligands coming from several keratin chains, thus forming crosslinks. Such a network limits the entry of additional cations into the fibre volume, although electron beam irradiation creates potential conditions to form other complexes in the inner layers as well.…”

Section: Discussionmentioning

confidence: 96%

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Radiation-modified wool for adsorption of redox metals and potentially for nanoparticles

Porubská

Jomová

Lapčík

et al. 2020

Nanotechnology Reviews

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Electron beam irradiated sheep wool with absorbed radiation doses ranging from 0 to 165 kGy showed good adsorption properties toward copper cations. The Cu(ii) being Lewis acid generated several types of complex salts based on carboxylates or cysteinates with ligands available in keratin. Under these conditions, cross-links were formed between the keratin chains. Experimental data obtained from Cu(ii) adsorption using the concentration of 800–5,000 mg/L were tested for fitting to 10 isotherm models. Various compositions and architectures of the Cu(ii)-complexes were specified to be responsible for different isotherm model fittings. The copper cation showed adherence to Langmuir, Flory–Huggins, and partially Redlich–Peterson models. The latter clearly distinguished the native wool from the modified ones. Another aim is to investigate the conditions for the adsorption of anti-microbial nanoparticles in addition to the redox-active metals on radiation-modified wool taking into account that the diffusion of nanoparticles into the modified wool is governed by electrostatic interactions.

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Section: Discussionmentioning

confidence: 96%

“…The effort to improve the wool adsorptivity leads to the treatment of the wool surface using several ways. All chemical modifications [8,[17][18][19] require wet processes, more operations and produce wastewater containing chemicals.…”

Section: Introductionmentioning

confidence: 99%

Radiation-modified wool for adsorption of redox metals and potentially for nanoparticles

Porubská

Jomová

Lapčík

et al. 2020

Nanotechnology Reviews

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“…17,18 Protein-based materials such as keratin have been applied to remove copper ions from the solution. 19,20 Keratin is a material abundant in nature and is a primary component of animal feathers, nails, horns, and surface epithelium. 21 Keratin is biocompatible and biodegradable, making it highly promising in the synthesis of polymer materials.…”

Section: Introductionmentioning

confidence: 99%

“…23,24 Due to the chemical properties of keratin, development of materials derived from feather waste for the treatment of heavy metal Cu(II) in wastewater is of great interest and has considerable economic benefits. 25 Although effort has been made to generate adsorbents using feather keratin and its derivatives to expunge Cu(II) from water, 19,20,[26][27][28][29] more experiments are needed to expand the application of keratin-derived materials in metal ion removal from the wastewater. To improve the efficiency, the integration of specific functional groups with potent coordination capabilities into an adsorbent can significantly enhance its targeted adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

Keratin-derived sorbents for efficient removal of copper ions from aqueous solutions

Feng,

Wu,

2024

New J. Chem.

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“…A special group of works is devoted to chemical modification of wool in order to improve its adsorption capacity. The modification concerns introducing suitable chelating groups able to coordinate with metal ions [ 12 , 13 , 14 , 15 ] or using partial hydrolysis of wool [ 16 ]. Besides metal ions, modified wool was applied in the removal of dye stuff from an aqueous solution [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Sheep Wool Humidity under Electron Irradiation Affects Wool Sorptivity towards Co(II) Ions

et al. 2021

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The effect of humidity on sheep wool during irradiation by an accelerated electron beam was examined. Each of the samples with 10%, 53%, and 97% relative humidity (RH) absorbed a dose of 0, 109, and 257 kGy, respectively. After being freely kept in common laboratory conditions, the samples were subjected to batch Co(II) sorption experiments monitored with VIS spectrometry for different lapses from electron beam exposure. Along with the sorption, FTIR spectral analysis of the wool samples was conducted for cysteic acid and cystine monoxide, and later, the examination was completed, with pH measuring 0.05 molar KCl extract from the wool samples. Besides a relationship to the absorbed dose and lapse, the sorptivity results showed considerable dependence on wool humidity under exposure. When humidity was deficient (10% RH), the sorptivity was lower due to limited transformation of cystine monoxide to cysteic acid. The wool pre-conditioned at 53% RH, which is the humidity close to common environmental conditions, demonstrated the best Co(II) sorptivity in any case. This finding enables the elimination of pre-exposure wool conditioning in practice. Under excessive humidity of 97% RH and enough high dose of 257 kGy, radiolysis of water occurred, deteriorating the sorptivity. Each wool humidity, dose, and lapse showed a particular scenario. The time and humidity variations in the sorptivity for the non-irradiated sample were a little surprising; despite the absence of electron irradiation, relevant results indicated a strong sensitivity to pre-condition humidity and lapse from the start of the monitoring.

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Peculiarities of Sorption of Copper(II) Ions by Modified Wool Keratin

Cited by 12 publications

References 22 publications

Radiation-modified wool for adsorption of redox metals and potentially for nanoparticles

Radiation-modified wool for adsorption of redox metals and potentially for nanoparticles

Keratin-derived sorbents for efficient removal of copper ions from aqueous solutions

Sheep Wool Humidity under Electron Irradiation Affects Wool Sorptivity towards Co(II) Ions

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