Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 62, Issue -, Pages 225-231Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2013.08.038
Keywords
Vinyl-functionalized alginate; Nanoporous hydrogel; Pb2+ absorption; Italic acid
Funding
- National Natural Science Foundation of China [20877077]
- 863 Project of the Ministry of Science and Technology, PR China [2013AA031403]
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Vinyl-functionalized sodium alginate (VSA) was used as matrix and crosslinker to fabricate VSA-co-methylacrylic acid-co-italic acid (VSA-co-MAA-co-IA) nano-porous hydrogels using micelle/emulsion as the pore-forming template. H-1 NMR, C-13 NMR, FTIR and UV-vis analyses proved that vinyl groups were introduced to SA backbone, and the VSA was reacted with the vinyl monomers by a free-radical polymerization to form a hydrogel network. The nano-pores can be uniformly formed in the hydrogels by introducing micelle template as shown by FESEM observations. The absorption properties of the hydrogels for Pb2+ ions were investigated by evaluating the absorption isotherm and absorption kinetics. Results showed that the hydrogel has higher absorption capacities for Pb2+ ion (432.28 mg/g for 880 mg/L Pb2+ solution and 765.75 mg/g for 2800 mg/L Pb2+ solution), and the formation of nanoporous structure clearly enhanced the absorption rate by 32.56% (for 880 mg/L Pb2+ solution) and 36.79% (for 2800 mg/L Pb2+ solution). (C) 2013 Elsevier B.V. All rights reserved.
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