University of Oulu

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.

Column adsorption studies for the removal of ammonium using Na-zeolite-based geopolymers

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Author: Sundhararasu, Elavarasi1; Runtti, Hanna1; Kangas, Teija1;
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
2Unit of Applied Chemistry, Kokkola University Consortium Chydenius, University of Jyvaskyla, Talonpojankatu 2B, FI-67100 Kokkola, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2022
Publish Date: 2023-01-12


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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Series: Resources
ISSN: 2079-9276
ISSN-E: 2079-9276
ISSN-L: 2079-9276
Volume: 11
Issue: 12
Article number: 119
DOI: 10.3390/resources11120119
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: This work was supported by Maa-ja Vesitekniikan tuki ry and conducted as part of WaterPro (ERDF Project No. A74635, funded by the Central Ostrobothnia Regional Council, the European Union, the European Regional Development Fund, and the Leverage from the EU).
Copyright information: © 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 (