Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China.
J Colloid Interface Sci. 2010 Nov 1;351(1):122-7. doi: 10.1016/j.jcis.2010.07.042. Epub 2010 Jul 23.
Graphene oxide (GO) can be aggregated by Cu(2+) in aqueous solution with a huge Cu(2+) absorption capacity. The Cu(2+) causes GO sheets to be folded and also to form large aggregates that were characterized by confocal microscopy and atomic force microscopy. The folding/aggregation is most likely triggered by the coordination between GO and Cu(2+). The equilibrium Cu(2+) concentrations and equilibrium absorption capacity of GO were measured to estimate the maximum absorption capacity of GO for Cu(2+) and the absorption model. GO has a huge absorption capacity for Cu(2+), which is around 10 times of that of active carbon. Representative results are presented and the implication to Cu(2+) removal is discussed.
氧化石墨烯（GO）在水溶液中可以与大量的 Cu(2+) 聚集，Cu(2+) 使 GO 片层发生折叠并形成大的聚集体，这一现象通过共聚焦显微镜和原子力显微镜进行了表征。GO 与 Cu(2+) 的配位作用很可能触发了折叠/聚集过程。通过测量平衡时的 Cu(2+) 浓度和 GO 的平衡吸附量，估算了 GO 对 Cu(2+) 的最大吸附容量和吸附模型。GO 对 Cu(2+) 的吸附容量巨大，约为活性炭的 10 倍。文中给出了有代表性的结果，并讨论了其对 Cu(2+) 去除的意义。
