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A nanoporous hydrogel based on vinyl-functionalized alginate for efficient absorption and removal of Pb2+ ions

Wang, Wenbo, Zong, Li, Wang, Aiqin
International journal of biological macromolecules 2013 v.62 pp. 225-231
Fourier transform infrared spectroscopy, absorption, carbon, emulsions, hydrocolloids, ions, lead, micelles, nuclear magnetic resonance spectroscopy, polymerization, sodium alginate, stable isotopes
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. 1H NMR, 13C 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 (432.28mg/g for 880mg/L Pb2+ solution and 765.75mg/g for 2800mg/L Pb2+ solution), and the formation of nanoporous structure clearly enhanced the absorption rate by 32.56% (for 880mg/L Pb2+ solution) and 36.79% (for 2800mg/L Pb2+ solution).