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The composite hydrogels based on N,N’-dimethylamino ethyl methacrylate   (DMAEMA) and polyethyleneimine (PEI) were prepared by amino radical   polymerization and confirmed by Fourier Transform Infrared Spectra (FTIR) and   elemental analysis. Then adsorption behavior and mechanism of Cr(VI) ions on   the obtained materials were investigated with scanning electron microscope,   Zeta potential and thermal gravity analysis, etc. The adsorption process was   found to follow the pseudo-second order kinetics and Langmuir model, and the   maximum adsorption capacity of Cr(VI) ions reached 122.8 mg g-1. X-ray   photoelectron spectroscopy (XPS) and pH analysis revealed that the Cr(VI)   ions were adsorbed into the gels through electrostatic interaction mechanism,   and SO42- in the solution had a great effect on the adsorption process. In   addition, high pH and ionic strength could reduce the uptakes of adsorbate,   which could be used for desorption of Cr(VI) ions from the gels

The adsorption behavior and mechanism investigation of Cr(VI) ions removal by poly(2-(dimethylamino)ethyl methacrylate)/poly(ethyleneimine) gels