为增强壳聚糖（CS）膜吸附重金属离子的能力，以CS为基体，利用乙二胺（EDA）对氧化石墨烯（GO）进行胺基化改性，将改性后的GO （n-GO）引入CS制备得到壳聚糖/胺基化氧化石墨烯（CS/n-GO）复合膜。探究吸附时间、吸附剂质量、溶液pH、初始质量浓度等条件下复合膜对铜离子（Cu²⁺）吸附性能的影响。结果表明，GO表面成功接枝上了氨基，最佳的胺基化摩尔比为n（GO）∶n（EDA）=1∶8。在吸附时间为12 h、溶液pH=4、吸附剂质量为70 mg、初始质量浓度为50 mg/L时，CS/n-GO复合膜对Cu²⁺吸附效果最好，吸附率最高可达92.8%。CS/n-GO复合膜对Cu²⁺的吸附动力学符合准二级动力学方程，吸附模型符合Langmuir等温吸附模型。经过5次吸-脱附实验后，复合膜仍可重复使用。

To enhance the adsorption capacity of chitosan (CS) membranes to heavy metal ions,CS is used as a matrix,graphene oxide (GO) is aminated by ethylenediamine (EDA),chitosan/aminated graphene oxide (CS/n-GO) composite membranes are prepared by tape casting method.The effects of adsorption time,adsorbent dosage,solution pH and initial concentration of copper ions (Cu²⁺) on the adsorption properties of the composite membrane to Cu²⁺ are investigated.The results show that amino groups have been successfully grafted onto GO surface,and the optimum amination molar ratio of GO：EDA is 1：8.CS/n-GO composite membranes have the best adsorption effect on Cu²⁺ and the highest adsorption rate can reach 92.8% when the adsorption time is 12 h,the solution pH=4,the dosage of adsorbent is 100 mg and the initial concentration of Cu²⁺ is 50 mg·L^-1.The adsorption kinetics of CS/n-GO composite membranes to Cu²⁺ conforms to the second-order kinetics equation,and the adsorption model conforms to Langmuir isothermal adsorption model.After experiencing five adsorption-desorption experiments,the composite membrane can still be reused.

李璐(1996-),女,硕士研究生,研究方向为生物吸附膜,leelu1996@163.com