Version 1
: Received: 9 August 2024 / Approved: 12 August 2024 / Online: 12 August 2024 (14:07:37 CEST)
How to cite:
Abed, T. H.; Stefan, D. S.; Berger, D.; Marinescu, N. C.; Stefan, M. Evaluation of the Performance of Romanian Zeolite for Removing the Ammonium Ions from Waters. Preprints2024, 2024080815. https://doi.org/10.20944/preprints202408.0815.v1
Abed, T. H.; Stefan, D. S.; Berger, D.; Marinescu, N. C.; Stefan, M. Evaluation of the Performance of Romanian Zeolite for Removing the Ammonium Ions from Waters. Preprints 2024, 2024080815. https://doi.org/10.20944/preprints202408.0815.v1
Abed, T. H.; Stefan, D. S.; Berger, D.; Marinescu, N. C.; Stefan, M. Evaluation of the Performance of Romanian Zeolite for Removing the Ammonium Ions from Waters. Preprints2024, 2024080815. https://doi.org/10.20944/preprints202408.0815.v1
APA Style
Abed, T. H., Stefan, D. S., Berger, D., Marinescu, N. C., & Stefan, M. (2024). Evaluation of the Performance of Romanian Zeolite for Removing the Ammonium Ions from Waters. Preprints. https://doi.org/10.20944/preprints202408.0815.v1
Chicago/Turabian Style
Abed, T. H., Nicolaie Cicerone Marinescu and Mircea Stefan. 2024 "Evaluation of the Performance of Romanian Zeolite for Removing the Ammonium Ions from Waters" Preprints. https://doi.org/10.20944/preprints202408.0815.v1
Abstract
Ammonium ion is a chemical species that is found in abundance in natural waters, whether underground or surface, but also in wastewater resulting from agricultural and industrial activities. Even if the removal of the ammonium ion from water has been studied for a very long time, it has been found that its removal is far from being solved. In this study, we evaluated the performance of the ammonium ions adsorption process on two adsorbents, zeolite clinoptilolite, ZR, (manufacturer Zeolite Develop-ment SRL, Rupea, Brasov, Romania) and the other granular activated carbon type Norit GAC 830 W. In the first step the paper presents the mineralogical (XRD) and structural (SEM and EDX) characterization of the ZR and determination of the pH zero-point charge, pHZPC, for all the adsorbents. Studies were carried out in equilibrium and kinetic conditions. The efficiency of the adsorbent was investigated in different experimental conditions by varying the initial concentration, particle size, temperature, pH, ionic strength and contact time. The mathematical models and parameters specific to the adsorption isotherms that best describe the experimental results were identified. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich mathematical models were used for comparison. The Langmuir isotherm proved to be the most appropriate to describe the adsorption of ammonium ions on all types of adsorbents used. The adsorption capacity of ammonium ion from synthetic solutions, at 20 °C, pH = 6.09, for the range of initial concentrations 0 - 50 mg/L for Rupea Zeolite is in the range of 10.46 mg/g -12.34 mg/g and for granular activated carbon GAC W830 is 16.64 mg/g. It was found that the increase in temperature and pH have a positive effect on the adsorption capacity of the ammonium ion on the studied adsorbents, and the ionic strength determines the decrease in the adsorption capacity. Kinetic models were also identified that best describe the experimental processes. In this sense, pseudo first order, pseudo second order, intraparticle diffusion and the Elovich model were used. The results of the investigation showed that second-order kinetics governs the adsorption process on ZR zeolites and pseudo-first order for activated carbon.
Keywords
ammonium removal; adsorption; ionic exchange; equilibrium and kinetic studies; mathematical model characterization
Subject
Environmental and Earth Sciences, Water Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
