New crosslinked poly (ionic liquid) cryogels for fast removal of methylene blue from waste water

New crosslinked Poly(ionic liquids), PILs, cryogels based on 2-acrylamido- 2-methylpropane sulfonic acid, AMPS, were prepared and copolymerized with acrylic acid, acrylamide or 2-hydroxyethyl methacrylate in the presence of triethanolamine. The crosslinking copolymerization of AMPS were carried in the presence of water at cooling temperature in the presence of amoniumpersulfate, N,N, N′, N′ tetramethylethylenediamine and N,N′-methylenebisacrylamide as radical initiator, activator and crosslinker, respectively. The chemical structures, surface morphologies of the PILs cryogels were investigated. The PILs cryogels showed high thermal stability and interconnected pores. The cryogels achieved high adsorption capacity as 1228 mg·g−1 for removal of MB from aqueous solution during contact times ranged from 5 to 10 min. New mechanism for chemisorption of MB with the active centers of PIL cryogels is proposed and elucidated.