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In this work, a novel hydrogel⁄Fe 2 O 3  composite was synthesized using the microwave-induced copolymerization/sol-gel method. The synthesised hydrogel⁄Fe 2 O 3  composite was characterised by many instruments as FT-IR, XRD, FE-SEM, CHN elemental analysis, and UV-Vis spectrophotometer. The broad peak in the XRD pattern confirms the amorphous structure of the synthesised hydrogel⁄Fe 2 O 3  composite. The diffraction peaks at 2ϴ = 26.92°, 23.50°, and 12.80°, indexed as (013), (130), and (021), respectively confirm the presence of crystalline sheets of chitin. The presence of a peak at 2ϴ = 16.73° (154) was observed because of the presence of polyacrylamide. The synthesised hydrogel⁄Fe 2 O 3  composite was used for the removal of acid orange 8 dye from aqueous media by the adsorption/photocatalytic method. The % removal (% R) increases with an increase in time from 5 min (% R = 14) to 25 min (% R = 52), and after that, approximate stability occurs. In the case of the presence of hydrogen peroxide and hydrogel⁄Fe 2 O 3  composite, the % degradation (% D) under UV irradiations increases with an increase in irradiation time from 10 min (% D = 37.50) to 50 min (% D = 100). The first order is the suitable kinetic model for the description of adsorption and photocatalytic processes.

international journal of environmental analytical chemistry

Utilisation of adsorption/photocatalytic method for efficient removal of acid orange 8 dye from aqueous media using a novel hydrogel/Fe 2 O 3  composite