title: A nanoporous hydrogel based on vinyl-functionalized alginate for efficient absorption and removal of Pb2+ ions.
abstract: 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. (1)H NMR, (13)C 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 Pb(2+) ions were investigated by evaluating the absorption isotherm and absorption kinetics. Results showed that the hydrogel has higher absorption capacities for Pb(2+) ion (432.28 mg/g for 880 mg/L Pb(2+) solution and 765.75 mg/g for 2800 mg/L Pb(2+) solution), and the formation of nanoporous structure clearly enhanced the absorption rate by 32.56% (for 880 mg/L Pb(2+) solution) and 36.79% (for 2800 mg/L Pb(2+) solution).
authors.affiliation: Center for Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.
authors.forename: Wenbo
authors.initials: W
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Zong
authors.forename: Aiqin
authors.initials: A
authors.lastname: Wang
mesh_terms: D065966:Absorption, Physicochemical; D000464:Alginates / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry* / Q000302:isolation & purification*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry*; D007700:Kinetics; D007854:Lead / Q000737:chemistry* / Q000302:isolation & purification*; D049329:Nanostructures / Q000737:chemistry*; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D016062:Porosity
chemical_list: D000464:Alginates; D004785:Environmental Pollutants; D006603:Hexuronic Acids; D020100:Hydrogels; D011109:Polymethacrylic Acids; D007854:Lead; D020723:Glucuronic Acid
keywords: Italic acid; Nanoporous hydrogel; Pb(2+) absorption; Vinyl-functionalized alginate