Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 47, Issue 9, Pages 1322-1333Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2012.672515
Keywords
hydrogels; isotherms; Methylene Blue; polyacrylamide; sorption
Funding
- CNCSIS-UEFISCSU
- European Social Fund - Cristofor I. Simionescu Postdoctoral Fellowship Programme, Sectoral Operational Programme Human Resources Development [ID POSDRU/89/1.5/S/55216]
- [PNII-IDEI ID 981/2008]
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Ionic composite hydrogels based on polyacrylamide (PAAm) and dextran sulfate (DxS) have been prepared by radical polymerization at two temperatures: +20 degrees C and -18 degrees C, using DxS as physical entrapped polymer, acrylamide (AAm) monomer, N,N'(-)methylene-bis(acrylamide) (BAAm) as cross-linking agent, ammonium persulfate as radical initiator, and N,N,N',N'-tetramethylethylenediamine as accelerator of free-radical polymerization. The PAAm/DxS composite hydrogels were tested as sorbents for Methylene Blue (MB) from aqueous solution by the batch procedure. The effect of contact time, initial dye concentration, and temperature on the dye sorption onto composite hydrogels has been investigated. The modeling of the experimental data by applying different kinetic and isotherm models was also performed.
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