石墨烯水凝胶的制备及其吸附性能研究

Preparation of Graphene Hydrogel and Study on Its Adsorption Properties

通过改进的Hummers法制备氧化石墨烯(GO),利用乙二胺(EDA)作还原剂,制得三维网状结构石墨烯水凝胶。利用紫外分光光度计考察了其对Pb ^(2+)的吸附性能,结果表明:120 min左右达到吸附平衡,并且在吸附剂用量为18 mg、氯化铅溶液质量分数为80 mg/L时,吸附效果最好,并且其吸附行为更符合准二级吸附动力学模型,说明石墨烯水凝胶对Pb ^(2+)的吸附主要为化学吸附。

Graphene oxide(GO)was prepared by the improved Hummers method,and ethylenediamine(EDA)was employed as the reducing agent to prepare three-dimensional networked graphene hydrogel.Using ultraviolet spectrophotometer to examine its performance of Pb^(2+)adsorption,the results showed that it took around 120 minutes to reach adsorption equilibrium,and with the adsorbent dosage of 18 mg and the lead chloride solution mass fraction of 80 mg/L,the adsorption effect was the best,and its adsorption behavior conformed better to the secondary adsorption dynamics model,indicating that the Pb^(2+)adsorption of graphene hydrogels is mainly chemical adsorption.