环糊精-氧化石墨烯复合材料的制备及其对Cu^(2+)的吸附性能研究

Preparation and Adsorptive Property of Cyclodextrin/Graphene Oxide Composite for Cu^(2+)

采用改进的hummer法制备出氧化石墨烯,再与适量的环糊精溶液以及水合肼和氨水进行还原反应得到环糊精-氧化石墨烯复合材料,测定了复合材料在不同pH、时间、温度等条件下对水体中的Cu^(2+)的吸附量。结果表明,环糊精-石墨烯复合材料对水溶液中的Cu^(2+)具有优异的吸附性能,在中性条件下,经24 h后吸附量达212.44 mg/g,吸附率为83.46%;这主要是因为氧化石墨烯的巨大表面积和表面含氧基团对Cu^(2+)的静电吸引力,以及环糊精的空腔结构所致。

The graphene oxide(GO) was prepared by a modified hummer ’s method and then reacted with a proper amount of cyclodextrin solution, hydrazine hydrate and ammonia water to obtain a cyclodextrin/GO composite. The amounts of adsorption of the composite for Cu^2+ were measured at different pH values, time and temperatures. The results indicated that the cyclodextrin/GO composite exhibited an excellent adsorption capability to Cu^2+ in aqueous solutions, and its adsorption capacity reached 212.44 mg/g after 24 h under the neutral condition, presenting the adsorption efficiency of 83.46 %. Such a result was mainly due to the large surface area of the graphene oxide and the electrostatic attraction of the surface oxygen-containing groups to Cu2+ as well as the cavity structure of cyclodextrin.