Preparation of graphene oxide aerogel and its adsorption for Cu2+ ions
Preparation of graphene oxide aerogel and its adsorption for Cu2+ ions
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DOI：
10.1016/j.carbon.2012.06.013
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发表时间：
2012-11-01
期刊：
影响因子：
10.9
通讯作者：
Gao, Jianping
中科院分区：
文献类型：
--
作者：
Mi, Xue;Huang, Guanbo;Gao, Jianping
采用单向冷冻干燥法（UFDM）制备氧化石墨烯（GO）气凝胶，观察其结构，并评价其对水溶液中Cu2+的吸附性能。结果表明，氧化石墨烯气凝胶具有单向多孔结构，对Cu2+具有良好的吸附能力。吸附系统依赖于Cu2+浓度，并遵循准二级动力学模型。很快达到吸附平衡。Langmuir模型能很好地模拟吸附等温线。氧化石墨烯气凝胶对Cu2+的吸附强烈依赖于pH值，表明存在离子交换机制。结果表明，氧化石墨烯气凝胶可作为水中Cu2+的有效吸附剂。(C) 2012 Elsevier Ltd.版权所有。
Graphene oxide (GO) aerogels were prepared by a unidirectional freeze-drying method (UFDM), their structure was observed and their adsorption performance for Cu2+ in aqueous solution was evaluated. The results show that GO aerogels have unidirectional porous structure and good adsorption ability for Cu2+. The adsorption system is depended on the Cu2+ concentration and follows a pseudo second-order kinetic model. The adsorption equilibrium is reached soon. The adsorption isotherms are simulated well by the Langmuir model. The adsorption of Cu2+ on GO aerogels is strongly dependent on pH, indicating an ion exchange mechanism. The obtained results demonstrated that the GO aerogels can be used as an effective adsorbent for Cu2+ removal from water. (C) 2012 Elsevier Ltd. All rights reserved.