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Título : Potential biopolymer adsorbent functionalized with Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solution
Autor: Vanegas Peña, Maria Eulalia
Castro Tamay, Pablo Reinaldo
Novoa, Néstor
Arrué, Ramón
Juela Quintuña, Diego Marcelo
Cruzat Contreras, Christian Americo
Correspondencia: Vanegas Peña, Maria Eulalia, eulalia.vanegas@ucuenca.edu.ec
Palabras clave : Chitosan
Fe3O4 nanoparticles
Cr (VI) removal
Metal adsorption
Área de conocimiento FRASCATI amplio: 1. Ciencias Naturales y Exactas
Área de conocimiento FRASCATI detallado: 1.4.4 Ciencia de Los Polímeros
Área de conocimiento FRASCATI específico: 1.4 Ciencias Químicas
Área de conocimiento UNESCO amplio: 05 - Ciencias Físicas, Ciencias Naturales, Matemáticas y Estadísticas
ÁArea de conocimiento UNESCO detallado: 0521 - Ciencias Ambientales
Área de conocimiento UNESCO específico: 052 - Medio Ambiente
Fecha de publicación : 2022
Fecha de fin de embargo: 30-jun-2023
Volumen: Volumen 30, número 5
Fuente: Journal of Polymers and the Environment
metadata.dc.identifier.doi: 10.1007/s10924-021-02323-y
Tipo: ARTÍCULO
Abstract: 
In the present study, an adsorbent with a synergistic effect was developed from chitosan (CS) and Fe3O4 nanoparticles (Fe3O4 Nps) to remove Cr(VI) from aqueous solutions. The Fe3O4 Nps were synthesized by co-precipitation and were characterized by TEM. The CS/NPs composites were prepared by electrospinning technique and analyzed by SEM, FT-IR, DSC, and TGA. In the batch system, the influence of Fe3O4 Nps content, pH, contact time, Cr(VI) initial concentration, adsorbent dosage, and the temperature was investigated; the Cr(VI) concentration was determined using a colorimetric method by UV–Vis spectroscopy. The Fe3O4 Nps presented a quasi-spherical shape and an average size of 18 nm, with a low particle distribution. The SEM analysis reveals the presence of highly porous, interconnected micrometric structures. The optimal adsorption conditions were 1% load of Fe3O4 Nps by weight of CS, pH 3, 25 °C, and equilibrium was reached at just 9 min. Besides, the adsorption is favored by increasing Cr(VI) initial concentration and adsorbent dosage. The studies of reaction kinetics and adsorption equilibrium showed that the experimental data were better fitted to the Pseudo-second-order and Langmuir isotherm models, establishing monolayer formation and chemisorption. The maximum adsorption capacity of CS/ Fe3O4 Nps was 440.75 mg/g, which indicates a high affinity of the adsorbent for Cr(VI). Finally, a kinetic diffusion study established that intraparticle diffusion, and in particular surface diffusion, are important resistances in the transport of Cr(VI) from the liquid phase to the active site.
URI : https://www.scopus.com/record/display.uri?eid=2-s2.0-85118919809&origin=resultslist&sort=plf-f&src=s&st1=Potential+Biopolymer+Adsorbent+Functionalized&sid=a17eaa92736ad77438789126fcfc5bf3&sot=b&sdt=b&sl=60&s=TITLE-ABS-KEY%28Potential+Biopolymer+Adsorbent+Functionalized%29&relpos=3&citeCnt=1&searchTerm=#author-keywords
URI Fuente: https://www.springer.com/journal/10924/
ISSN : 1566-2543, e 1572-8900
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