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- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received October 13, 2024
Revised December 29, 2024
Accepted January 5, 2025
Available online July 25, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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The Preparation of Na-A Zeolite Using Sludge Gasifi cation Ash and Its Application in Cu 2+ Removal from Wastewater
https://doi.org/10.1007/s11814-025-00389-1
Abstract
As the generation of sewage sludge increases, the gasifi cation thermochemical treatment of sewage sludge has been regarded
as an important alternative. So, this study Na-A zeolite was synthesized from the gasifi cation solid residue (ash) of sewage
sludge to evaluate its recycling potential. The crystallinity of synthesized Na-A zeolite could be enhanced up to 84.8% optimizing
by the Si/Al ratio to 0.8, the reaction temperature to 100 °C, and reaction time to 8 h. The Na-A zeolite, synthesized
under these optimal conditions, was employed as an adsorbent for Cu 2+ removal in wastewater. The adsorption interaction
between Cu 2+ and Na-A zeolite was well-described by the pseudo-second-order model, indicating an ion exchange mechanism
with electron transfer between the contaminant ion and the adsorbent. The theoretical equilibrium adsorption capacity for
Na-A, derived from the pseudo-second-order model, was found to be 80.99 mg/g. Adsorption isotherm analysis revealed that
the Langmuir model, which posits monolayer adsorption, was more appropriate than other models. These fi ndings indicate
that gasifi cation sewage sludge residues can serve as an economical alternative and have potential as an adsorbent material.
