Change in pH and conductivity during the rinsing and the biosorption of copper ions onto pumpkin peel
Conference Object Restricted access M34
2025
Marković, Marina
Gorgievski, Milan 
Marković, Miljan
Grekulović, Vesna
Štrbac, Nada
Zdravković, Milica
Božinović, Kristina
Univerzitet u Zenici, Fakultet inženjerstva i prirodnih nauka
Book of abstracts with electronic edition of Proceedings - 15th Scientific - Research Symposium with International Participation, Metallic and Nonmetallic Materials – Production, Properties, Application, 24th–25th April 2025, Zenica, Bosnia and Herzegovina
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58
English
M34 - Conference paper at an international conference, printed as an 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 is 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.
biosorption, pumpkin peel, pH, conductivity
ISSN
2566-4352