Studies on barium ion binding by polymer

Abstract

Polycrylamide is a water soluble polymer used in paper industry. Aqueous solution of polyacrylamide binds Y3+ and Cu2+ when pH is raised. In this present investigation binding of Ba2+ ion by industrial polycarylamide sample (PAm) has been understood by TGA, DTA, DSC analysis, IR Spectral analysis, SEM study and by EDS study. When aqueous solution of PAm is mixed with barium nitrate solution & pH is raised by adding 60% NaOH solution, a deep white layer separates on standing which is treated with MeOH to get barium ion bound Polymer (PAm-Ba2+). DTA thermogram for PAm shows an endotherm near about at 2700C which indicates acid anhydride formation or imide formation indicating presence of –COOH group in industrial polyacrylamide sample.Similar endothermic peak at 2700C is almost absent in the DTA thermogram for barium ion bound polymer (PAm Ba2+) which indicates involvement of –COOH group of PAm in binding Ba2+ at high pH. This is further supported by IR spectra, TG analysis, DSC analysis, SEM study and EDS study.