60 Polyelectrolyte CASA hydrogels for uptake of uranyl ions from aqueous solutions

Author(s): Karadag, E (Karadag, Erdener); Uzum, OB (Uzum, Omer Baris); Kundakci, S (Kundakci, Semiha); Saraydin, D (Saraydin, Dursun)
Title: Polyelectrolyte CASA hydrogels for uptake of uranyl ions from aqueous solutions
Source: JOURNAL OF APPLIED POLYMER SCIENCE, 104 (1): 200-204 APR 5 2007
Language: English
Document Type: Article
Author Keywords: acrylamide; hydrogel; swelling; sorption; uranyl ion
Keywords Plus: ACID HYDROGELS; ADSORPTION; REMOVAL; WATER; DIMETHACRYLATE; URANIUM; BEADS

Abstract: In this study, uranyl ion adsorption from aqueous solutions has been investigated by chemically crosslinked acrylamide/sodium acrylate (CASA) hydrogels. Adsorption studies were investigated by the spectroscopic method. CASA hydrogels with various compositions were prepared from ternary mixtures of acrylamide (A), sodium acrylate (SA), and water by free radical polymerization in aqueous solution, using multifunctional crosslinkers such as ethylene glycol dimethacrylate (EGDMA). Uranyl ion adsorption from aqueous solutions was studied by the batch sorption technique at 25 degrees C. The effect of uranyl ion concentration and mass of adsorbent on the uranyl ion adsorption were examined. In experiments of sorption, L-type sorption in the Giles classification system was found. Some binding parameters, such as initial binding constant (K-i), equilibrium constant (K), monolayer coverage (n), site-size (it), and maximum fractional occupancy ((O) over cap) for the CASA hydrogel-uranyl ion binding system, were calculated using the Langmuir linearization method. Finally, the amount of sorbed uranyl ion per gram of dry hydrogel (q) was calculated to be 4.44 x 10(-4)-14.86 x 10(-4) mol uranyl ion per gram for CASA hydrogels. Adsorption of uranyl ion (percentage) was changed within a range of 12.86-46.71%. (c) 2007 Wiley Periodicals, Inc.

Addresses: Adnan Menderes Univ, Dept Chem, Fen Edebiyat Fac, TR-09010 Aydin, Turkey; Cumhuriyet Univ, Dept Chem, TR-58140 Sivas, Turkey
Reprint Address: Karadag, E, Adnan Menderes Univ, Dept Chem, Fen Edebiyat Fac, TR-09010 Aydin, Turkey.
E-mail Address: ekaradag@adu.edu.tr
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Cited Reference Count: 21
Times Cited: 0
Publisher: JOHN WILEY & SONS INC
Publisher Address: 111 RIVER ST, HOBOKEN, NJ 07030 USA
ISSN: 0021-8995
29-char Source Abbrev.: J APPL POLYM SCI
ISO Source Abbrev.: J. Appl. Polym. Sci.
Source Item Page Count: 5
Subject Category: Polymer Science

ISI Document Delivery No.: 138PQ