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Title:Adsorption efficiency of cadmium (II) by different alkali-activated materials
Authors:ID Mladenović Nikolić, Nataša (Author)
ID Kljajević, Ljiljana (Author)
ID Nenadović, Snežana B. (Author)
ID Potočnik, Jelena (Author)
ID Knežević, Sanja (Author)
ID Dolenec, Sabina (Author)
ID Trivunac, Katarina (Author)
Files:URL URL - Source URL, visit https://www.mdpi.com/2310-2861/10/5/317
 
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MD5: D338C52D5597B43DCA20FE322B3E4D7F
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo ZAG - Slovenian National Building and Civil Engineering Institute
Abstract:The objective of this study was to demonstrate the potential utilization of fly ash (FA), wood ash (WA), and metakaolin (MK) in developing new alkali-activated materials (AAMs) for the removal of cadmium ions from waste water. The synthesis of AAMs involved the dissolution of solid precursors, FA, WA, and MK, by a liquid activator (Na2SiO3 and NaOH). In concentrated solutions of the activator, the formation of an aluminosilicate gel structure occurred. DRIFT spectroscopy of the AAMs indicated main vibration bands between 1036 cm−1 and 996 cm−1, corresponding to Si-O-Si/Si-O-Al bands. Shifting vibration bands were seen at 1028 cm−1 to 1021 cm−1, indicating that the Si-O-Si/Si-O-Al bond is elongating, and the bond angle is decreasing. Based on the X-ray diffraction results, alkali-activated samples consist of an amorphous phase and residual mineral phases. The characteristic “hump” of an amorphous phase in the range from 20 to 40◦ 2θ was observed in FA and in all AWAFA samples. By the XRD patterns of the AAMs obtained by the activation of a solid three-component system, a new crystalline phase, gehlenite, was identified. The efficiency of AAMs in removing cadmium ions from aqueous solutions was tested under various conditions. The highest values of adsorption capacity, 64.76 mg/g (AWAFA6), 67.02 mg/g (AWAFAMK6), and 72.84 mg/gmg/g (AWAMK6), were obtained for materials activated with a 6 M NaOH solution in the alkali activator. The Langmuir adsorption isotherm and pseudo-second kinetic order provided the best fit for all investigated AAMs.
Keywords:fly ash, metakaolin, wood ash, adsorption kinetics, cadmium (II)
Publication status:Published
Publication version:Version of Record
Publication date:05.05.2024
Publisher:MDPI AG
Year of publishing:2024
Number of pages:str. 1-23
Numbering:Vol. 10, iss. 5, [article no. 317]
PID:20.500.12556/DiRROS-18981 New window
UDC:54
ISSN on article:2310-2861
DOI:10.3390/gels10050317 New window
COBISS.SI-ID:194423043 New window
Copyright:© 2024 by the authors. Licensee MDPI, Basel, Switzerland.
Note:Nasl. z nasl. zaslona; Opis vira z dne 6. 5. 2024;
Publication date in DiRROS:23.05.2024
Views:645
Downloads:418
Metadata:XML DC-XML DC-RDF
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MLADENOVIĆ NIKOLIĆ, Nataša, KLJAJEVIĆ, Ljiljana, NENADOVIĆ, Snežana B., POTOČNIK, Jelena, KNEŽEVIĆ, Sanja, DOLENEC, Sabina and TRIVUNAC, Katarina, 2024, Adsorption efficiency of cadmium (II) by different alkali-activated materials. Gels [online]. 2024. Vol. 10, no. 5,  317, p. 1–23. [Accessed 22 March 2025]. DOI 10.3390/gels10050317. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=18981
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Record is a part of a journal

Title:Gels
Shortened title:Gels
Publisher:MDPI AG
ISSN:2310-2861
COBISS.SI-ID:525301529 New window

Document is financed by a project

Funder:Other - Other funder or multiple funders
Project number:451-03-47/2023-01/200017
Funder:Other - Other funder or multiple funders
Project number:451-03-47/2023-01/200135

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:elektrofiltrski pepel, metakaolin, lesni pepel, amorfni gel, kinetika adsorpcije, kadmij


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