Chitin extraction from crab shells and synthesis of chitin @metakaolin composite for efficient amputation of Cr (VI) ions.

Autor: Algethami JS; Department of Chemistry, College of Science and Arts, Najran University, P.O. Box, 1988, Najran, 11001, Saudi Arabia; Advanced Materials and Nano-Research Centre (AMNRC), Najran University, Najran, 11001, Saudi Arabia., Jugade R; Department of Chemistry, R.T.M. Nagpur University, Nagpur, 440033, India. Electronic address: ravinj2001@yahoo.co.in., Billah El Kaim R; National School of Applied Sciences, Chouaib Doukkali University, Avenue Jabran Khalil Jabran B.P 299, 24000, El Jadida, Morocco. Electronic address: rachidelkaimbillah@gmail.com., Bahsis L; Laboratoire de Chimie Analytique Et Moléculaire, Faculté Poly-Disciplinaire, Morocco., Achak M; National School of Applied Sciences, Chouaib Doukkali University, Avenue Jabran Khalil Jabran B.P 299, 24000, El Jadida, Morocco; Chemical & Biochemical Sciences, Green Process Engineering, CBS, Mohammed VI Polytechnic University, Ben Guerir, Morocco., Majdoubi H; Materials Science Energy and Nanoengineering Department, Mohammed VI Polytechnic University, Benguerir, Morocco., Shekhawat A; Department of Chemistry, R.T.M. Nagpur University, Nagpur, 440033, India., Korde S; Department of Chemistry, R.T.M. Nagpur University, Nagpur, 440033, India., López-Maldonado EA; Faculty of Chemical Sciences and Engineering, Autonomous University of Baja California, 22424, Tijuana, Baja California, Mexico.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2024 Jul 01; Vol. 252 (Pt 4), pp. 119065. Date of Electronic Publication: 2024 May 07.
DOI: 10.1016/j.envres.2024.119065
Abstrakt: The present research study combines chitin from shrimp waste with the oxide-rich metakaolin. Metakaolin is a blend of mixed oxides rich in silica and alumina with good adsorbent properties. The chitin@metakaolin (CHt@M.K.) composite was synthesized and characterized using FTIR, SEM, TGA, XRD and XPS techniques. Cr(VI) removal studies were compared for chitin and CHt@M.K. through adsorption. It was found that the adsorption capacity of CHt@M.K. is 278.88 mg/g, almost double that of chitin, at pH 5.0 in just 120 min of adsorption. Isotherm models like Langmuir, Freundlich, Temkin and Dubinin-Radushkevich were investigated to comprehend the adsorption process. It was revealed that Langmuir adsorption isotherm is most suitable to elucidate Cr(VI) adsorption on CHt@M.K. The adsorption kinetics indicate that pseudo first order was followed, indicating that the physisorption was the process that limited the sorption process rate. The positive enthalpy change (20.23 kJ/mol) and positive entropy change (0.083 kJ/mol K) showed that the adsorption process was endothermic and more random at the solid-liquid interface. The negative free energy change over entire temperature range was an indicator of spontaneity of the process. Apart from all these, the non-covalent interactions between Cr(VI) and composite were explained by quantum calculations based models.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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