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Extraction of Keratin from Human Hair Waste as Adsorbent: Characterization, Thermodynamic and Kinetic Study for Removal of Chromium (VI) ions | ||
Pollution | ||
دوره 7، شماره 2، تیر 2021، صفحه 377-393 اصل مقاله (1.15 M) | ||
نوع مقاله: Original Research Paper | ||
شناسه دیجیتال (DOI): 10.22059/poll.2021.313734.937 | ||
نویسندگان | ||
Fereshteh Abbasi* 1؛ Abdolhadi Farrokhnia2؛ Zahra Abbasi3 | ||
1Department of Chemistry, Ilam Branch, Islamic Azad University, Ilam, Iran | ||
2Department of Chemistry, College of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
3Faculty of Science, Ilam University, P.O.Box 69315516, Ilam. Iran | ||
چکیده | ||
In this paper, human hair, as a waste material, was utilized in order to prepare keratin nanoparticles. The characterization of keratin nanoparticles was performed applying Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-Ray diffraction (XRD). The average diameter of keratin nanoparticles was found to be 63.7 nm, using particle size analyzer. Subsequently, the keratin nanoparticles were employed for Cr (VI) ions adsorption. The batch experiment was carried out to find the optimum conditions; i.e. contact time, pH, adsorbent dose and initial concentration of Cr (VI) ions. The adsorption capacity was extremely pH-dependent, and the maximum adsorption of Cr (VI) happened in the acidic pH range. The results demonstrated that the maximum adsorption capacity, obtained in acidic pH, was 161.29 mg/g. The equilibrium data were well fitted by Freundlich isotherm. The kinetic studies were performed with the Lagergren’s first-order, Pseudo-second order, Elovich, and Intra-particle diffusion models. In this sense, in order to describe kinetic data, we came to this understanding that Pseudo-second order model was the best choice. The thermodynamic parameters of the adsorption process indicated that the Cr (VI) adsorption on keratin nanoparticles is endothermic and spontaneous. | ||
کلیدواژهها | ||
Cr (VI) ions؛ Keratin nanoparticles؛ Isotherm؛ Adsorption kinetics؛ Hair Waste؛ optimum | ||
مراجع | ||
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