COMPARISON OF ETHYL ALCOHOL AND NITRIC ACID AS DESORBENTS FOR LANTHANUM IONS FROM MATRIX OF RARE-CROSSLINKED POLYMER HYDROGELS OF ACID AND BASIC NATURE

Abstract

Desorption process of lanthanum ions by 95 ethyl alcohol and 2M nitric acid from matrix of polymer hydrogels of polyacrylic acid (hPAA), polymethacrylic acid (hPMAA), poly-4-vinylpyridine (hP4VP), poly-2-methyl-5-vinylpyridine (hP2M5VP) was studied. For desorption hydrogels in the ratio: 33%hPAA:67%hP4VP, 17%hPMAA:83%hP4VP, 67%hPAA:33%hP2M5VP and 50%hPMAA:50%hP2M5VP were taken. Extraction degree of lanthanum ions at these ratios after 48 hours is 94.05; 90.34; 91.09; 89.65 respectively. Total desorption degree with ethyl alcohol is( %) 85.46; 82.26; 80/17; 77.27 respectively. Total desorption degree by nitric acid is( %) 96.27; 94.43; 92.55; 93.09 respectively. Such difference is due to the nature of the desorbents (as known, ethyl alcohol is a polar organic solvent, nitric acid – strong mineral acid).

References

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