The effect of gel composition on the uranyl ions adsorption capacity of poly(N-vinyl 2-pyrrolidone-g-citric acid) hydrogels prepared by gamma rays

✍ Scribed by Tuncer Çaykara; Sinan Ören; Ömer Kantoglu; Olgun Güven

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 174 KB
• Volume: 77
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/1097-4628(20000801)77:5<1037::aid-app10>3.0.co;2-g

✦ Synopsis

Poly(N-vinyl 2-pyrrolidone-g-citric acid) (PVP-g-CA) hydrogels with varying compositions were prepared from ternary mixtures of N-vinyl 2-pyrrolidone-citric acid-water by using 60 Co ␥-rays. The effect of gel composition on the uranyl ions adsorption capacity of PVP-g-CA hydrogels was investigated. Uranyl adsorption capacity of these hydrogels were found to be in the range of 18 -144 mg [UO 2 2ϩ ]/g dry gel from the aqueous solution of uranyl nitrate and 22-156 mg [UO 2 2ϩ ]/g dry gel from the aqueous solution of uranyl acetate, depending on the content of citric acid in the hydrogel, while poly(N-vinyl 2-pyrrolidone) hydrogel did not sorb any uranyl ion. The swelling of PVP-g-CA hydrogel containing 2.7 mol % CA was observed in water (1620%), in uranyl acetate solution (1450%) and in uranyl nitrate solution (1360%), as compared to 700% swelling of pure PVP hydrogels. The diffusion coefficients were varied from 12.57 up to 4.04 • 10 Ϫ8 m 2 s Ϫ1 .