Abstract：To enhance the adsorption capacity of chitosan (CS) for Cr (Ⅵ), the cross-linked magnetic chitosan modified by grafting with glutamic acid (Glu-CS/Fe3O4) was synthesized with glutamic acid, chitosan and Fe3O4 as raw materials and glutaraldehyde as the crosslinker. The product was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TG). The results showed that Glu-CS/Fe3O4 was successfully prepared. When 0.075 g of Glu-CS/Fe3O4 was added in 50 mL of 100 mg/L Cr (Ⅵ) solution (pH 3.0) for static adsorption at 40 ℃ for 120 min, the adsorption efficiency for Cr (Ⅵ) was close to 100% . The adsorption capacity of Glu-CS/Fe3O4 for Cr (Ⅵ) only decreased by 14.4% after adsorption-desorption for 6 times, indicating that it had good performance of recyclability. Through the study of adsorption kinetics and isothermal adsorption equation fitting test, it was found that the adsorption process of Glu-CS/Fe3O4 for Cr (Ⅵ) accorded with the characteristics of quasi-second-order kinetic equation and Langmuir isotherm adsorption model. The actual saturated adsorption capacity at 40 ℃ was 130.3 mg/g. This process belonged to monolayer chemisorption.
张雯雯, 雷昌贵. 谷氨酸接枝交联磁性壳聚糖对废水中铬(Ⅵ)的吸附性能[J]. 冶金分析, 2023, 43(6): 77-84.
ZHANG Wenwen, LEI Changgui. Adsorption performance of chromium (Ⅵ) in wastewater on cross-linked magnetic chitosan modified by grafting with glutamic acid. , 2023, 43(6): 77-84.
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