Removal of toxic Cr(VI) from water by a novel magnetic chitosan/glyoxal/PVA hydrogel film

This is the authors' abstract. We don't add key points for this paper.

Coprecipitation of FeCl2 and FeCl3 produced magnetic iron nanoparticles (Fe3O4NPs). The latter was dispersed in an acetic acid solution of chitosan (CS), and then cross-linked with glyoxal, followed by addition of polyvinyl alcohol (PVA). The resulting gel was neutralized with NaOH giving our novel Fe3O4NPs/CS/glyoxal/PVA hydrogel film. This film was used as an efficient and reusable adsorbent for the removal of toxic Cr(VI) from water, at a rather wide range of pH. The absorbent film was characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and energy dispersive X-ray. Langmuir isotherm model suggested maximum Cr(VI) adsorption occurring at room temperature. Kinetic studies suggested a pseudo-second-order model for the adsorption. Our Fe3O4NPs/CS/glyoxal/PVA hydrogel is hoped to serve as a promising Cr(VI) adsorbent in wastewater treatment technology.