Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents
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 t...
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MDPI AG
2020-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/23/5381 |
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| author | Agnieszka Adamczuk Weronika Sofinska-Chmiel Grzegorz Jozefaciuk |
| author_facet | Agnieszka Adamczuk Weronika Sofinska-Chmiel Grzegorz Jozefaciuk |
| author_sort | Agnieszka Adamczuk |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T14:31:46Z |
| format | Article |
| id | doaj.art-2002b13c8cb34f9c8b8a75509d0f5445 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:31:46Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-2002b13c8cb34f9c8b8a75509d0f54452023-11-20T22:31:16ZengMDPI AGMaterials1996-19442020-11-011323538110.3390/ma13235381Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the SorbentsAgnieszka Adamczuk0Weronika Sofinska-Chmiel1Grzegorz Jozefaciuk2Institute of Agrophysics PAS, Doswiadczalna 4 Str., 20-290 Lublin, PolandAnalytical Laboratory, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie Sklodowska University, Maria Curie Sklodowska Sq. 3, 20-031 Lublin, PolandInstitute of Agrophysics PAS, Doswiadczalna 4 Str., 20-290 Lublin, PolandOne 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.https://www.mdpi.com/1996-1944/13/23/5381fractalmercury intrusionisothermequilibriumkineticsthermodynamics |
| spellingShingle | Agnieszka Adamczuk Weronika Sofinska-Chmiel Grzegorz Jozefaciuk Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents Materials fractal mercury intrusion isotherm equilibrium kinetics thermodynamics |
| title | Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents |
| title_full | Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents |
| title_fullStr | Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents |
| title_full_unstemmed | Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents |
| title_short | Arsenate Adsorption on Fly Ash, Chitosan and Their Composites and Its Relations with Surface, Charge and Pore Properties of the Sorbents |
| title_sort | arsenate adsorption on fly ash chitosan and their composites and its relations with surface charge and pore properties of the sorbents |
| topic | fractal mercury intrusion isotherm equilibrium kinetics thermodynamics |
| url | https://www.mdpi.com/1996-1944/13/23/5381 |
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