海藻酸钠/改性氧化石墨烯复合气凝胶的制备及吸附性能研究

Research on Preparation and Adsorption Property of Sodium Alginate/Modified Graphene Oxide Composite Aerogels

文章利用β-环糊精接枝改性氧化石墨烯,采用原位交联和冷冻干燥技术制备了海藻酸钠/β-环糊精改性氧化石墨烯(SA/GO-β-CD)复合气凝胶,以Cu^(2+)、Cd^(2+)为代表性重金属离子,研究了所制备的复合气凝胶对水体中重金属离子的吸附性能。探讨了不同GO-β-CD浓度制备的复合气凝胶的吸附性能和力学性能,以及不同初始离子浓度下气凝胶对重金属离子的吸附性能。结果表明,随着GO-β-CD浓度的增加,气凝胶的机械强度及弹性均有增大,对重金属离子的吸附容量随着改性氧化石墨烯浓度的增加先升高再逐渐降低。SA/GO-β-CD复合气凝胶对Cu^(2+)和Cd^(2+)的最大吸附容量分别为134.67和160.66 mg/g。

In this paper,sodium alginate–β–cyclodextrin modified graphene oxide(SA/GO–β–CD)composite aerogels were prepared by in situ cross-linking and freeze-drying technology.The modified graphene oxide was synthesized by graftingβ–cyclodextrin on the graphene oxide.The adsorption properties of the composite aerogels on heavy metal ions in water were studied by using copper and cadmium ions as representative heavy metal ions.The adsorption and mechanical properties of the composite aerogels prepared by different GO–β–CD concentrations and the adsorption properties of aerogels on heavy metal ions at different initial ionic concentrations were discussed.The results showed that with the increase of GO–β–CD concentration,the mechanical strength and elasticity of aerogel increased,and the adsorption capacity increased firstly and then decreased with the increase of the concentration of modified graphene oxide.The maximum adsorption capacities of SA/GO–β–CD composite aerogels for Cu^(2+)and Cd^(2+)were 134.67 mg/g and 160.66 mg/g,respectively.