半胱氨酸/石墨烯复合凝胶的制备及对Hg2+吸附性质

Preparation of Cysteine/Grapheme Composite Gel and Its Adsorption Properties of Hg^(2+)

三维石墨烯材料整合二维石墨烯片层形成三维互联的多孔贯通网状结构,具有多孔性、高活性比表面积和优良传质性能等特点。利用L-半胱氨酸做还原剂,制备了还原氧化石墨烯并构建了石墨烯三维网状结构水凝胶,作为汞离子吸附剂。实验结果表明,氧化石墨烯在L-半胱氨酸作用下得到还原,通过分子间π-π堆积以及半胱氨酸之间的交联作用形成水凝胶,同时半胱氨酸的存在增加了对重金属Hg^(2+)的吸附位点,对Hg^(2+)饱和吸附量可达到98 mg/g。

Three-dimensional graphene material integrated two-dimensional graphene layers to form a three-dimensional interconnection porous network structure,which was characterized with porosity,high specific surface area and good mass transfer performance.A three-dimensional network of graphene hydrogel was constructed by the reduction of graphene oxide,using L-cysteine as reducing agent.It was used as an adsorbent for mercury ion.The results showed that L-cysteine reduced the graphene oxide successfully.The hydrogel was formed through intermolecularπ-πinteractions and the cross linked action between cysteines.At the same time,the existence of L-cysteine increased the adsorption sites for Hg 2+and the saturated adsorption capacity could reach to 98 mg/g.