Abstract
Several casein hydrogels were synthesized using glutaraldehyde as a crosslinker. The hydrogel prepared from 10 wt% casein and 5 wt% glutaraldehyde at pH = 7.5 showed the best adsorption performance for Cu2+ and methylene blue (MB). The morphology and thermal stability of the hydrogels were characterized by Fourier transform infrared spectrophotometry (FTIR), field emission scanning electron microscopy (FESEM) and thermo gravimetric analysis (TGA). Adsorption data were observed to fit well to pseudo second-order kinetics and the Freundlich-Langmuir switch model. The thermodynamic parameters of the adsorption showed that the adsorption of Cu2+ and MB into casein hydrogel was a spontaneous process.
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