Novel Magnetic Chitosan Hydrogel Film, Cross-Linked with Glyoxal as an Efficient Adsorbent for Removal of Toxic Cr(VI) from Water

A novel magnetic chitosan hydrogel film, cross-linked with glyoxal (Fe(3)O(4)NPs/CS/glyoxal), has been synthesized and used as an easily reusable adsorbent for 80-90 % removal of toxic Cr(VI) from water. A pseudo-second-order kinetic (with correlation coefficient R (2) > 0.99) is observed at room temperature. Characterization of the absorbent is carried out by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. The adsorption isotherm is well fitted in the Langmuir equation at different temperatures [R (2) > 0.99, and 0 < (Langmuir separation factor, R (L)) < 1]. So, our adsorbent, with the novelty of using glyoxal, and the ease of separation may be considered in Cr(VI) wastewater treatment technology.