University of Oulu

Hegazy, S., Manninen, M., Tuomikoski, S., Lassi, U., & Srivastava, V. (2024). Nano-impregnation on metakaolin backbone for enhanced removal of Cu(Ii) and Mn(Ii) ions in a binary system using fixed bed column. Separation and Purification Technology, 329, 125163.

Nano-impregnation on metakaolin backbone for enhanced removal of Cu(II) and Mn(II) ions in a binary system using fixed bed column

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Author: Hegazy, Sherif1; Manninen, Mikael1; Tuomikoski, Sari1;
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 13.4 MB)
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Language: English
Published: Elsevier, 2023
Publish Date: 2023-10-05


This paper presents a comprehensive study on the synthesis and characterization of a novel composite material composed of metakaolin (MK), cellulose nanofibers (CNF), graphene oxide (GO), and zinc oxide (ZnO) for the efficient removal of heavy metals from wastewater. The main objective of this research was to enhance the removal efficiency of Cu(II) and Mn(II) ions in a binary system using a fixed bed column adsorption technique while investigating the effect of impregnating the nanomaterials. The synthesized samples were subjected to a thorough characterization using various techniques. These analyses provided insights into the structural properties and morphology of the composite material. The adsorption performance of the MK/CNF/GO/ZnO composite was evaluated through breakthrough curve analysis and kinetic modeling. The MDR model provided good fits with R² values of 0.962 and 0.967 for Cu(II) and Mn(II) respectively. Based on the experimental breakthrough curve data, the saturation and breakthrough capacities of the composite material were calculated to be 5.97 mg/g and 4.84 mg/g for Cu(II) and Mn(II) respectively, achieved after a saturation time of 102 min for Cu(II) and 128 min for Mn(II). The results demonstrated a synergistic effect between GO and CNF, resulting in enhanced adsorption efficiency. The incorporation of ZnO nanoparticles further improved the adsorption capacity due to their high surface area, providing additional active sites for adsorption. The results showed that combining CNF, GO, and ZnO in a composite resulted in extended breakthrough and exhaustion times compared to the combination of CNF and GO alone.

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Series: Separation and purification technology
ISSN: 1383-5866
ISSN-E: 1873-3794
ISSN-L: 1383-5866
Volume: 329
Article number: 125163
DOI: 10.1016/j.seppur.2023.125163
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
1172 Environmental sciences
215 Chemical engineering
216 Materials engineering
Funding: S. Hegazy gratefully acknowledges the financial support provided by the Finnish Cultural Foundation.
Copyright information: © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (