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metals by different polysaccharides was also examined. No differences were observed between the lanthanide adsorption efficiencies, while differences in adsorption efficiency were found for the transition metals, due to the varying strengths of the interactions between the adsorbents and the metal ions. The presence of light metals in solutions with heavy metals having different molar ratios reduced adsorption efficiency as the concentration of light metal ions increased. To make the wastewater treatment process more cost-effective and environmentally friendly, the possibility of removing certain metal ions )Ce3+, Eu3+, Rh3+, Ru3+( from the hydrogels’ post-adsorption in a solution was tested using various solutions. The results showed that the tested salt solutions were more effective than acids for lanthanides. For heavy metals, no consistent trend was found. Finally, to understand the changes occurring in the adsorbents following the adsorption processes, TGA and FTIR analyses were conducted before and after the metal adsorption. TGA analysis revealed that the metal adsorption process affects the thermal stability of the polysaccharide. In addition, it supports the hypothesis that adsorption occurs via an ion-exchange mechanism. The FTIR analysis showed a shift in the characteristic sulfate ester group peak in I spectra with the tested lanthanide metals, and A spectra revealed interactions between the metals and the carboxyl group, supporting the hypothesis of chemical adsorption.
Keywords: Adsorption, Heavy metal, Hydrogel, Lanthanides, Polysaccharide.
Book Of Abstracts | Class 2024
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