A1 Journal article (refereed)
Removal of Ammonium Ions from Aqueous Solutions Using Alkali-Activated Analcime as Sorbent (2023)

Runtti, H., Sundhararasu, E., Pesonen, J., Tuomikoski, S., Hu, T., Lassi, U., & Kangas, T. (2023). Removal of Ammonium Ions from Aqueous Solutions Using Alkali-Activated Analcime as Sorbent. ChemEngineering, 7(1), Article 5. https://doi.org/10.3390/chemengineering7010005

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Publication details

All authors or editorsRuntti, Hanna; Sundhararasu, Elavarasi; Pesonen, Janne; Tuomikoski, Sari; Hu, Tao; Lassi, Ulla; Kangas, Teija

Journal or seriesChemEngineering


Publication year2023

Publication date12/01/2023


Issue number1

Article number5

PublisherMDPI AG

Publication countrySwitzerland

Publication languageEnglish


Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/85202


Five alkali-activated analcime (ANA) sorbents (ANA-MK 1, ANA 2, ANA 3, ANA-MK 4, and ANA-MK 5) were developed for ammonium (NH4+) ion removal. Acid treatment and calcination were used as pre-treatments for analcime, and metakaolin (MK) was used as a blending agent in three sorbents. Sorption experiments were performed to evaluate the effects of sorbent dosage (1–20 g L−1), initial NH4+ ion concentration (5–1000 g L−1), and contact time (1 min–24 h). ANA-MK 1, ANA 2, and ANA-MK 4 were the most efficient sorbents for NH4+ ion removal, with a maximum experimental sorption uptake of 29.79, 26.00, and 22.24 mg g−1, respectively. ANA 3 and ANA-MK 5 demonstrated lower sorption capacities at 7.18 and 12.65 mg g−1, respectively. The results for the sorption of NH4+ ions onto the alkali-activated analcime surfaces were modeled using several isotherms. The Langmuir, Freundlich, Sips, and Bi-Langmuir isotherms were the best isotherm models to represent the studied systems. The results of the kinetic studies showed the maximum NH4+ ion removal percentage of the sorbents was ~80%, except for ANA-MK 5, which had a ~70% removal. Moreover, the pseudo-first-order, pseudo-second-order, and Elovich models were applied to the experimental data. The results showed that the sorption process for ANA-MK 1, ANA 2, ANA 3, and ANA-MK 4 followed the Elovich model, whereas the pseudo-second-order model provided the best correlation for ANA-MK 5.

Keywordsnitrogen compoundscationssorptionmineralssilicatesnitrogen fixationwaste water treatment

Free keywordsalkali-activated analcime; ammonium ion; isotherm models; kinetic models; sorption

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Reporting Year2023

Preliminary JUFO rating1

Last updated on 2024-03-04 at 19:36