Strengthening of graphene aerogels with tunable density and high adsorption capacity towards Pb2+.
Strengthening of graphene aerogels with tunable density and high adsorption capacity towards Pb2+.
复制标题
密度可调且对 Pb2 具有高吸附能力的石墨烯气凝胶的强化
DOI：
10.1038/srep05025
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发表时间：
2014-05-22
影响因子：
4.6
通讯作者：
Yang J
中科院分区：
文献类型：
--
作者：
Han Z;Tang Z;Shen S;Zhao B;Zheng G;Yang J
通过将石墨烯水凝胶（GHs）浸泡在氨水溶液中，制备了具有高机械强度、密度和体积可调的石墨烯气凝胶（GAs）。通过调节氨溶液的浓度来控制所得气体的密度和体积。随着氨溶液浓度的增加，气体体积减小，但其比表面积保持在350m2g−1左右，经氨溶液处理后，气体内部结构呈径向结构。因此，由于其高比表面积和独特的多孔结构，气体特别适合于吸附和储能应用。气体对Pb2+的吸附量保持在80 mg g−1左右，最高可达5000 g m−3 /单位体积，吸附后易于与水分离。
Graphene aerogels (GAs) with high mechanical strength, tunable density and volume have been prepared only via soaking graphene hydrogels (GHs) in ammonia solution. The density and volume of the obtained GAs are controlled by adjusting the concentration of ammonia solution. Although volume of the GAs decreases with increasing the concentration of ammonia solution, its specific surface area maintains at about 350 m2g−1and the inner structure changes to radial after ammonia solution treatment. Thus, GAs are particularly suitable for the adsorption and energy storage applications owing to their high specific surface area and unique porous structure. The adsorption capacity of GAs for Pb2+from aqueous solution maintains at about 80 mg g−1, which could reach as high as 5000 g m−3per unit volume and they can be separated easily from water after adsorption.
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