Thermodynamics and Mechanism of the Adsorption of Heavy Metal Ions on Keratin Biomasses for Wastewater Detoxification

Thermodynamics and Mechanism of the Adsorption of Heavy Metal Ions on Keratin Biomasses for Wastewater Detoxification

The analysis of thermodynamics and mechanism of the adsorption of cadmium, chromium, copper, and lead ions from aqueous solution with two keratin-based biomaterials, namely, human hair and sheep fur, is reported in this paper. The effect of initial ion concentration, temperature, pH, contact time, a...

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Bibliographic Details
Published in:Adsorption science & technology Vol. 2022
Main Authors: Olawale, Salaudeen Abdulwasiu, Bonilla-Petriciolet, Adrián, Mendoza-Castillo, Didilia Ileana, Okafor, Chibueze Charles, Sellaoui, Lotfi, Badawi, Michael
Format: Journal Article
Language:English
Published: Oxford Hindawi 2022
Sage Publications Ltd
SAGE Publications
Subjects:
Activated carbon
Adsorbents
Adsorption
Aqueous solutions
Biomedical materials
Chromium
Enthalpy
Hair
Heavy metals
Ion adsorption
Ion concentration
Keratin
Lead
Metal ions
Sheep
Thermodynamics
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Summary:The analysis of thermodynamics and mechanism of the adsorption of cadmium, chromium, copper, and lead ions from aqueous solution with two keratin-based biomaterials, namely, human hair and sheep fur, is reported in this paper. The effect of initial ion concentration, temperature, pH, contact time, and biomaterial amount on the removal of these heavy metal ions using these keratinous adsorbents was studied. The adsorption of heavy metal ions was highly dependent on the operating parameters where pH and temperature showed the highest impact. Maximum adsorption capacities of these biomaterials were up to 1.33 and 1.40 mmol/g for chromium ions using human hair and sheep fur, respectively. Adsorption kinetic rates of tested heavy metal ions were calculated via a pseudo-second-order model, and they ranged from 0.054 to 0.261 g/mmol·min. A detailed thermodynamic analysis of lead ion adsorption was performed showing an endothermic removal of this adsorbate with both human hair and sheep fur with adsorption enthalpies of 84.5 and 97.1 kJ/mol, respectively. Statistical physics calculations demonstrated that this heavy metal ion was adsorbed via a multi-interaction mechanism especially for human hair. These keratinous biomaterials showed competitive adsorption capacities especially for chromium ion removal and can outperform commercial activated carbons and other adsorbents reported in literature.
ISSN:0263-6174
2048-4038
DOI:10.1155/2022/7384924