COMPARATIVE CHARACTERISTICS OF SORPTION PARAMETERS OF INTERGEL SYSTEMS BASED ON POLYACRYLIC AND POLYMETHACRYLIC ACIDS AND POLY-4-VINYLPYRIDINE AT SIMULTANEOUS EXTRACTION OF LANTHANUM AND CERIUM IONS

Abstract

The work shows features of simultaneous extraction of lanthanum and cerium ions by intergel systems 33%hPAA-67%hP4VP and 17%hPMAA-83%hP4VP from common solution. It is found that formation of optimal ionization of the initial hydrogels for sorption lanthanum ions occurs at this composition. Results showed that during of the all time of sorption the intergel systems manifest selectivity to lanthanum. Extraction degree (at 48 hours) are: 82.87% and 42.65% for 33%hPAA-67%hP4VP and 72.55% and 32.22% for 17%hPMAA-83%hP4VP for lanthanum and cerium ions respectively. Polymer chain binding degree (in relation to lanthanum and cerium ions) are: 68.74% and 35.38% for 33%hPAA-67%hP4VP and 60.18% and 26.73% for 17%hPMAA-83%hP4VP respectively. Effective dynamic exchange capacity (in relation to lanthanum and cerium ions) are: 5.52 mmol/g and 2.84 mmol/g for 33%hPAA67%hP4VP and 4.84 mmol/g and 2.15 mmol/g for 17%hPMAA-83%hP4VP.

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