Change in pH and conductivity during the rinsing and the biosorption of copper ions onto pumpkin peel
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Date
2025
Authors
Marković, Marina
Gorgievski, Milan
Marković, Miljan
Grekulović, Vesna
Štrbac, Nada
Zdravković, Milica
Božinović, Kristina
Journal Title
Journal ISSN
Volume Title
Publisher
University of Zenica, Faculty of Metallurgy and Technology
Source
Journal of Sustainable Technologies and Materials
Volume
5
Issue
8
Abstract
The changes in pH and conductivity during the rinsing of the pumpkin peel, and the biosorption of Cu2+ ions, were the subject of this work. The obtained data showed that the pH value of the solutions increased during the rinsing of the biosorbent, as a result of the transfer of H+ ions from the aqueous phase into the structure of the pumpkin peel. An increase in the conductivity value was observed in the initial period of rinsing the pumpkin peel, followed by a decrease. The increase in conductivity in the initial phase contributed to the self-leaching of the alkali and alkaline earth metal ions from the structure of the pumpkin peel, which were transferred into the aqueous phase. The further decrease in conductivity is a result of the dilution of the aqueous phase. The pH value decreased during the biosorption of Cu2+ ions, as hydrogen ions were transferred from the pumpkin peel structure into the solution, and then exchanged with Cu2+ ions. The conductivity value increased during the biosorption process, with a rapid increase in the initial period of 5 minutes, due to the transfer of alkali and alkaline earth metal ions into the solution.
Description
Keywords
biosorption, pumpkin peel, pH, conductivity
Citation
DOI
10.57131/jstm.2025.8.1
Scopus
ISSN
2744-2659
2744-2640
2744-2640
ISBN
License
CC-BY