Abstract: Chitosan semi-interpenetrating thermo-swelling hydrogels (Semi-INP) were synthesized by chitosan, acrylamide, and thermosensive macromonomer as raw materials and N, N′-methylenebis (acrylamide) as crosslinker through aqueous solution semi-interpenetrating network polymerization method. Magnetic chitosan semi-interpenetrating thermo-swelling hydrogels (Semi-INP/Fe3O4) were obtained by introducing Fe3O4 nanoparticles into Semi-INP through an in situ chemical co-precipitation method. The prepared samples were characterized by Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), thermal gravimetry (TG), and field emission scanning electron microscopy (SEM). The thermo-swelling property and the effects of adsorption time, temperature, absorbent dosage on the adsorption of Cr(Ⅵ) were investigated. Experimental results show Semi-INP/Fe3O4 were successfully prepared, and the hydrogels had good thermo-swelling properties. The adsorption removal of Cr(Ⅵ) increased with the increasing of adsorption time and adsorption temperature. The increase of absorbent dosage would raise the removal efficiency. At the condition of temperature is 70 ℃, pH=3.0, 10 g/L Semi-INP3/Fe3O4, and the initial Cr(Ⅵ) concentration is 10 mg/L, the removal efficiency could reach 98.03%.
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2021, Vol. 35 
