Preparation of Gelatin-Epoxy Poly(ether amine) Crosslinked Membrane and Its Adsorption Behavior for Heavy Metal Ions

Polyethyleneglycol diglycidyl ether (PEO-DE) and polydimethylsiloxane diglycidyl ether (PDMS-DE) were used as difunctional monomers to react with anhydrous piperazine (molar ratio was 1:1:1) to synthesize a novel kind of epoxy poly(ether amine) (ePEA) ended with epoxy groups.Then ePEA was mixed with gelatin in aqueous solution,casting in teflon mold to get dried crosslinked membrane.FT-IR,XRD patterns,DSC and Atomic Absorption Sepectroscopy(AAS) were exploited to study the structure and heavy metal ions adsorption capacities of the gelatin-ePEA crosslinked membrane.Results showed that gelatin was chemically crosslinked by ePEA,which could improve the stability of the gelatin membrane swelling in water.And the gelatin-ePEA crosslinked membrane exhibited a good adsorption ability to Cu²⁺,Pb²⁺ and Cd²⁺ in water,which was increased with the increasing of ePEA content.Adsorption process could be matched with pseudo second order model and Langmuir model.