Selective Ion Pair Adsorption of Cobalt and Copper Salts on Cationically Produced Poly(1,3-divinylimidazolid-2-one)/Silica Hybrid Particles
✍ Scribed by Torsten Meyer; Silvio Prause; Stefan Spange; Manfred Friedrich
- Book ID
- 102580726
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 99 KB
- Volume
- 236
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
DEDICATED TO PROFESSOR E. G. JAEGER, UNIVERSITY OF JENA/GERMANY, ON THE OCCASION OF HIS 65TH BIRTHDAY For quantitative metal salt adsorption, poly(1,3-divinylimidazolid-2-one)/silica [poly BVU(cat.)/silica] particles with different polymer contents have been synthesized by a cationic surface polymerization of 1,3-divinylimidazolid-2-one onto silica. Preliminary experiments with the metal ion salts CoCl 2 , CoI 2 , CuCl 2 , and FeCl 3 on poly-BVU(cat.)/silica particles, a radically produced poly-BVU(rad.) resin, and a cationically produced poly-BVU(cat.) resin have been carried in acetone solution to check the suitability of the adsorbents. The adsorption mechanism for Co 2+ and Cu 2+ on poly-BVU(cat.)/silica is in accordance with the Langmuir model for monolayer adsorption as shown by quantitative adsorption measurements by means of UV/vis spectroscopy. An ion pair adsorption mechanism is suggested for CoCl 2 , CoI 2 , and CuCl 2 on poly-BVU(cat.)/silica because both environments cationically produced poly-BVU and residual silanol groups are required for linking the cation and anion. ESR spectroscopic results of CoCl 2 -, CuCl 2 -, and FeCl 3 -poly-BVU(cat.)/silica hybrid adsorbates show selective adsorption for Co 2+ and Cu 2+ . However, two different adsorption sites are indicated for Fe 3+ on poly-BVU(cat.)/silica.