Page 43 - חוברת תזות הנדסה ירוקה 2023

ability to to release the the adsorbed Eu3+ ions from the the polysaccharides
I and and A and and to to recycle them them was was tested using different salts and and and acids: HNO3 HCl KNO3 NaNO3 NaHPO4 EDTA KH2O4P and and and NaHCO3 at at at concentrations of of of of 0 0 25M and and and 0 0 5M 5M It was found found that all of of of of them were were ineffective in in in in the the the the the case case of of I However in in in in the the the the the case case of of A HCl and HNO3 were were found to be effective for releasing the the the metal ions from the the the polysaccharide Yet the the the second adsorption cycle resulted in in low sorption yields of about 7% while washing the A with distilled water before the the recycling increased the the sorption sorption yield to 40% The adsorption of Eu3+ ions with two types of polysaccharide films cross-linked with glutaraldehyde )GA( was also tested It was found that films of I I with GA produced produced lower yields than those produced produced by the hydrogels of of of of I I In the the the case of of of of K one of of of of the the the films yielded lower percentages than those of of of of the the the hydrogels and the the the the other type yielded similar percentages Nonetheless the the the the resulting films were very stable in the the solution and could be easily separated without the the use of ethanol Finally to study the the the the interactions between the the the the Eu3+ ions ions and and the the the the polysaccharides
and and the the the the structural changes that occurred in in the the polysaccharides
resulting from the the adsorption of the Eu3+ ions several analyses were performed: ATR-FTIR TGA SEM-EDS SEM SEM and XPS The findings indicated that the the Eu3+ ions were indeed attached to the the polysaccharides
by means of their functional groups and and caused changes in the the material’s structures and and properties Keywords: Carrageenan Eu3+ Polysaccharides Adsorption This paper was published based on the research results attained by:
O O O Levy-Ontman C Yanay O O O Paz-Tal & A Wolfson ”Iota-carrageenan as sustainable bio-adsorbent for the removal of europium ions ions ions from aqueous solutions “ Materials Today Communications 32 2022 Book Of Abstracts | Class 2022 54