Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents
1
Institute of Agrophysics PAS, Doswiadczalna 4 Str., 20-290 Lublin, Poland
2
Analytical Laboratory, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie Sklodowska University, Maria Curie Sklodowska Sq. 3, 20-031 Lublin, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(23), 5381; https://doi.org/10.3390/ma13235381
Received: 29 October 2020 / Revised: 17 November 2020 / Accepted: 25 November 2020 / Published: 26 November 2020
One of the ways to recycle millions of tons of fly ash and chitin wastes produced yearly is their utilization as low-cost sorbents, mainly for heavy metal cations and organic substances. To improve their sorption efficiency, fly ashes have been thermally activated or modified by chitosan. We aimed to deeply characterize the physicochemical properties of such sorbents to reveal the usefulness of modification procedures and their effect on As(V) adsorption. Using low temperature nitrogen adsorption, scanning electron microscopy, mercury intrusion porosimetry, potentiometric titration and adsorption isotherms of As(V) anions, surface, pore, charge and anion adsorption parameters of fly ash activated at various temperatures, chitosan, and fly ash modified by chitosan were determined. Arsenate adsorption equilibrium (Langmuir model), kinetics (pseudo-second order model) and thermodynamics on the obtained materials were studied. Neither temperature activation nor chitosan modifications of fly ash were necessary and profitable for improving physicochemical properties and As(V) adsorption efficiency of fly ash. Practically, the physicochemical parameters of the sorbents were not related to their anion adsorption parameters.
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Keywords:
fractal; mercury intrusion; isotherm; equilibrium; kinetics; thermodynamics; waste management
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MDPI and ACS Style
Adamczuk, A.; Sofinska-Chmiel, W.; Jozefaciuk, G. Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents. Materials 2020, 13, 5381.
AMA Style
Adamczuk A, Sofinska-Chmiel W, Jozefaciuk G. Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents. Materials. 2020; 13(23):5381.
Chicago/Turabian StyleAdamczuk, Agnieszka; Sofinska-Chmiel, Weronika; Jozefaciuk, Grzegorz. 2020. "Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents" Materials 13, no. 23: 5381.
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