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 Pb2+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 Pb2+的吸附主要为化学吸附。
关键词: 还原氧化石墨烯 / 水凝胶 / 铅离子 / 吸附
Abstract:
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 ultravilet spectrophotometer to examine its performance of Pb2+ 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 efect was the best, and its adsorption behavior conformed beter to the secondary adsorption dynamics model, indicating that the Pb2+ adsorption of graphene hydrogels is mainly chemical adsorption.
Keywords: reduced graphene oxide / water gel / lead ion / adsorption