187. Ni-Doped Graphene/Carbon Cryogels and Their Applications As Versatile Sorbents for Water Purification.
作者：G. Wei, Y.-E. Miao, C. Zhang, Z. Yang, Z. Y. Liu, W. W. Tjiu, T. X. Liu*
关键字：graphene, carbon cryogels, Ni doping, water purification
论文来源：期刊
具体来源：ACS Appl. Mater. Interfaces, 2013, 5(15), 7584-7591.
发表时间：2013年
Ni-doped graphene/carbon cryogels (NGCC) have been prepared by adding resorcinol and formaldehyde to suspension of graphene oxide (GO), using Ni2+ ions as catalysts for the gelation process to substitute the usually used alkaline carbonates. The metal ions of Ni2+ have elevated the crosslinking between GO and RF skeletons, thus strengthening the whole cryogel. The as-formed three-dimensional (3D) interconnected structures, which can be well-maintained after freezedrying of the hydrogel precursor and subsequent carbonization under an inert atmosphere, exhibit good mechanical properties. During the carbonization process, Ni2+ ions are converted into Ni nanoparticles and thus embedded in the interconnected structures. The unique porosity within the interconnected structures endows the cryogels with good capability for the extraction of oils and some organic solvents while the bulk form enables its recycling use. When ground into powders, they can be used as adsorbents for dyestuffs. Therefore, the as-obtained cryogels may find potential applications as versatile candidates for the removal of pollutants from water.