氧化石墨烯复合气凝胶的制备及其对铜离子的吸附性能

Preparation and Cu^(2+) Adsorption Performance of Graphene Oxide Composite Aerogel

文章以海藻酸钠(SA)与氧化石墨烯(GO)为原料,碳酸钙和葡萄糖酸内酯为交联剂,利用溶液共混法及冷冻干燥技术制备了海藻酸钠/氧化石墨烯(SA/GO)复合气凝胶。对制备的气凝胶进行了结构表征和机械性能研究,并探讨了其对铜离子的吸附性能。结果表明:气凝胶内部具有丰富稳定的三维网状结构,压缩性能随着氧化石墨烯的增加不断增强。当GO质量分数为3%时,SA/GO复合气凝胶对铜离子的吸附效果较好,相对纯海藻酸钠气凝胶提高了35.9%,且其吸附行为符合准二级动力学模型。

In this paper,sodium alginate/graphene oxide(SA/GO)composite aerogel was prepared from sodium alginate(SA)and graphene oxide(GO)as raw materials,calcium carbonate(CaCO3)and gluconolactone(GDL)as crosslinking agents via solution blending and freeze-drying technology.The paper studied structural characterization and mechanical properties of the prepared aerogel and investigated their adsorption property on copper ions.The results showed that the aerogel was rich in stable three-dimensional mesh structure,and the compressive property was enhanced with the increase of graphene oxide content.When the GO content was 3%,the SA/GO composite aerogel has a good adsorption effect on copper ions.The adsorption performance was improved by 35.9%compared with that of sodium alginate aerogel and was in accordance with the pseud o-second-order kinetics model.