Facile synthesis and characterization of a magnetic biosorbent derived from sodium alginate and activated graphite schist: Experimental and statistical physics analysis for Mn(VII) remediation.

Autor: Ali MA; School of Biotechnology, Badr University in Cairo (BUC), Badr City, Cairo 11829, Egypt., Mobarak M; Physics Department, Faculty of Science, Beni-Suef University, 62511, Egypt., Salah AM; Faculty of Earth Science, Beni-Suef University, 62511, Egypt., Yehia A; Department of Mineral Beneficiation and Agglomeration, Central Metallurgical R&D Institute, P.O. Box 87, Helwan, Cairo, Egypt., Lima EC; Postgraduate Program in Mine, Metallurgical, and Materials Engineering (PPGE3M), School of Engineering, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, Porto Alegre, RS, Brazil; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Goncalves 9500, Postal Box, 15003, Porto Alegre, RS ZIP 91501-970, Brazil., Seliem AQ; Faculty of Earth Science, Beni-Suef University, 62511, Egypt., Elshimy AS; Faculty of Earth Science, Beni-Suef University, 62511, Egypt., Al-Dossari M; Department of Physics, Faculty of Science, King Khalid University, Abha 62529, Saudi Arabia., El-Gawaad NSA; Department of Physics, Faculty of Science, King Khalid University, Abha 62529, Saudi Arabia., Bendary HI; Chemical Engineering Department, Higher Institute of Engineering, El-Shorouk Academy, Shorouk City, Cairo, Egypt., Seliem MK; Faculty of Earth Science, Beni-Suef University, 62511, Egypt. Electronic address: debakyms@yahoo.com.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2024 Mar; Vol. 261 (Pt 1), pp. 129692. Date of Electronic Publication: 2024 Jan 24.
DOI: 10.1016/j.ijbiomac.2024.129692
Abstrakt: H 2 O 2 -modified graphite schist (GS) and sodium alginate (SA) interface was loaded by Fe 3 O 4 nanoparticles (MNPs) to prepare a magnetic biosorbent that was employed in removing Mn(VII) from solutions. The prepared GS/SA/MNPs adsorbent was investigated using a variety of techniques, including elemental mapping, TEM, XPS, FTIR, FESEM, EDX, XRD, XPS, and zeta potential. An experimental study supported by statistical physics calculations was carried out to obtain a new outline of the Mn(VII) uptake mechanism. The classical Freundlich and the statistical physical double-layer models adequately described the Mn(VII) uptake process at pH 3.0 and a temperature of 25-55 °C. The removed number of Mn ions (such as Mn +7 and Mn +2 ) per GS/SA/MNPs active site ranged from 0.70 to 0.84, indicating a mixed adsorption orientation driven by surface complexation and attraction forces mechanisms. The adsorption energies (∆E) calculated by the double-layer model ranged from 18.79 to 24.94 kJ/mol, suggesting that the interaction between Mn(VII) and GS/SA/MNPs was controlled by physical forces. Increasing the adsorption capacity at saturation (Q sat ) from 333.14 to 369.52 mg/g with temperature proposed an endothermic capture process. Thermodynamic functions clarified the viability and spontaneity of Mn(VII) uptake on the GS/SA/MNPs adsorbent.
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 B.V. All rights reserved.)
Databáze: MEDLINE