COMPARATIVE CHARACTERISTICS OF SORPTION PROPERTIES OF POLY-4-VINILPYRIDINE AND POLY-2-METHYL-5VINILPYRIDINE IN RELATION TO RARE-EARTH ELEMENTS IONS

Abstract

The rare-earthelements (lanthanum, cerium, neodymium, and samarium) ions sorption by individual hydrogels of poly-4-vinylpyridine (gP4VP) and poly-2-methyl-5-vinylpyridine (gP2M5VP) was studied. The maximum values of the extraction degree by gP4VP were observed after 48 hours, while the degree of extraction was 66.05%; 56.67%; 54.60%; 62.89% respectively for lanthanum, cerium, neodymium, samarium ions.The final polymer chain binding degree values by poly-4-vinylpyridine hydrogel were 55.00%; 47.00%; 45.60%; 52.10% for the La, Ce, Nd, Sm ions, respectivelyand was achieved after 48 hours of the starting contact of the polymer hydrogel with thenitrates solutions.The maximum effective dynamic exchange capacitieswere 4.95; 3.78; 3.67; 4.30 mmol/g for the La, Ce, Nd, Sm ions, respectively,andwere observed at 48 hours of the interaction. The maximum values of the extraction degree were 63.65%; 50.00%; 48.60%; 57.60% for La, Ce, Nd, Sm ions, respectivelyby gP2M5VP and were observed after 48 hours.The final values of the polymer chain binding degree 53.00%; 41.47%; 38.80%; 48.40%for lanthanum, cerium, neodymium, and samarium ions, respectively, were reached after 48 hours.At 24 hours of interaction, the exchange capacity was 4.47; 2.71; 2.56; 3.13 mmol/g. Further P2M5VP hydrogel ionization was very weak, which indicated the approached equilibrium state. The maximum effective dynamic exchange capacities were 4.77; 3.33; 3.07; 4.17 mmol/g were observed for the La, Ce, Nd, Sm ions, respectively at 48 hours. The obtained results indicate the possibility of creating and improving the selective systems for lanthanum, cerium, neodymium, and samarium ions sorption technologies.

References

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