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Removal of cadmium (II) from aqueous solution using fermented grape marc as a new adsorbent
Faculty of Metallurgy and Technology, University of Montenegro, Podgorica, Montenegro
Biosorption of cadmium from aqueous solutions using fermented grape marc, as well as influence of the most important factors, such as: contact time, granulation of biosorbent and the initial concentration of metal ions, is investigated in this paper. The equilibrium sorption of cadmium ions is achieved after 15-20 min, depending on the initial concentration of metal ions. Such a short time needed to achieve the equilibrium indicates that mass sorption is the dominant process. Langmuir, Freundlich and Dubinin-Radushkevich isotherms were used to describe the equilibrium sorption process, and the Langmuir model was found to be the most convenient. Maximum of sorption capacity is 20 mg g-1. EDS spectrum analysis showed that the process of ion exchange is one of the main sorption mechanisms. Minor changes observed in the FTIR spectrum of grape marc after the sorption of Cd(II) ions indicate the formation a bond between metal ions and partially ionized carboxyl and phenol groups from the biomass. The results of this study confirmed that fermented grape marc, due to its porous structure and characteristic chemical composition, is a good sorption material.


article language: English
document type: Scientific Paper
DOI: 10.2298/CICEQ140418027G
published in SCIndeks: 13/01/2016

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