Removal of as(V), Cr(VI) and Cr(III) heavy metal ions from environmental waters using amidoxime and quaternized hydrogels

Acrylonitrile (AN) and 1-vinyl imidazole (VI) based hydrogel was prepared in bulk (macro) dimensions via redox polymerization technique. Afterward, this quaternized (positively charged) exposed to the amidoximation reaction. The hydrogels (quart-p(AN-co-VI), amid-p(AN-co-VI) p(VI)) characterized using fourier transform infrared spectroscopy (FT-IR) thermal gravimetric analysis (TGA). Swelling experiments were performed gravimetrically at room temperature deionized water different pH solution. Water absorbencies of both amidoximated founded be high. Prepared used remove heavy metal ions such as arsenic(V) (As(V)), Chromium(VI) (Cr(VI)) Chromium(III) (Cr(III)) from aqueous media. sorption As(V), Cr(VI) Cr(III) by carried out initial ion concentrations, pHs, times batch 25oC. maximum capacity all order: As(VI)>Cr(VI)>Cr(III). for As(VI), found 598, 303.8 4.9 mg g-1 amid-p(AN-co-VI), respectively. As result of, have more than hydrogels. Three kinetic models (pseudo first order, pseudo second order intraparticle diffusion model) also investigate mechanisms. Furthermore, Langmuir Freundlich isotherms investigated these ions. a quaternization AN VI been promising technique increase rate are thought provide great advantages removal wastewaters. Especially, among p(AN-co-VI) modification processes, reaction give better results selective versus As(V) Cr(VI).