Column adsorption studies for the removal of ammonium using Na-zeolite-based geopolymers
Sundhararasu, Elavarasi; Runtti, Hanna; Kangas, Teija; Pesonen, Janne; Lassi, Ulla; Tuomikoski, Sari (2022-12-11)
Sundhararasu E, Runtti H, Kangas T, Pesonen J, Lassi U, Tuomikoski S. Column Adsorption Studies for the Removal of Ammonium Using Na-Zeolite-Based Geopolymers. Resources. 2022; 11(12):119. https://doi.org/10.3390/resources11120119
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe202301122488
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Abstract
The aim of this study was to examine the removal of ammonium ions from a synthetic model solution by using Na-zeolite-based geopolymers. Na-zeolite (=analcime) is a residue from mining industry. Three adsorbents were prepared from Na-zeolite using different production steps and metakaolin as a blending agent. These novel adsorbents were investigated in a fixed-bed column system where the effects of different flow rates with the initial ammonium concentration of 40 mg/L were studied. The Thomas, Bohart–Adams and Yoon–Nelson breakthrough curve models fitted well with the experimental data with a high R² value. After adsorption experiments, adsorbents were regenerated using a mixture of 0.2 M NaCl and 0.1 M NaOH as a regeneration agent; after that, adsorbents were reutilised for ammonium ion adsorption for three adsorption–regeneration cycles. The results of the experiment indicate that all the prepared analcime-based geopolymers are suitable adsorbents for the removal of ammonium ions and that capacity remains nearly constant for two of them during two adsorption–regeneration cycles.
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