Factors affecting the complexation of polyacrylic acid with uranyl ions in aqueous solutions: A luminescence study

• Published in: Journal of polymer science. Part B, Polymer physics Vol. 43; no. 19; pp. 2737 - 2744
• Main Authors: Dubolazov, Artem V., Güven, Olgun, Pekel, Nursel, Mun, Grigoriy A., Nurkeeva, Zauresh S.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01-10-2005; Wiley
• Subjects: Applied sciences; Exact sciences and technology; luminescence spectroscopy; nonlinear Stern-Volmer; Organic polymers; Physicochemistry of polymers; polyacrylic acid; Properties and characterization; Solution and gel properties; uranyl ion; Fluorescence spectrum; Uranyl complexes; Complexation; polyacrylic acid; uranyl ion; Temperature effect; Metal ion; Experimental study; Emission spectrum; Polyelectrolyte; luminescence spectroscopy; nonlinear Stern-Volmer; Ionic strength; Acrylic acid polymer; Luminescence quenching; pH; Aqueous solution; Saline solution
• ISSN: 0887-6266; 1099-0488
• DOI: 10.1002/polb.20566

A study was carried out in aqueous solutions using luminescence technique to investigate the effects of pH, salt concentration, and temperature on the polyacrylic acid/uranyl ion (PAA/UO 22+) complex formation as well as competitive phenomena of enhancement and quenching effects on photoexcited state of uranyl ions. It was found that excess of H+ and OH− is not favorable for complexation between uranyl ions and polymer. Added nitrate salts of Na+ and K+ had significant enhancement effect on emission spectra of PAA/UO 22+ complex. These results indicated that the metal ion/polymer chain complex collapsed by addition of salts and then complex became more compact with consequent phase separation. No significant effect of temperature on the PAA/UO 22+ complex stability has been observed between 25–50 °C. The quenching rate constants obtained from Stern–Volmer plots were found to be in the order of kq(H+) >> kq(K+) > kq(Na+). © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2737–2744, 2005