Xu Minghan, Chai Jing, Hu Nantao, Huang Da, Wang Yuxi, Huang Xiaolu, Wei Hao, Yang Zhi, Zhang Yafei
Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Nanotechnology. 2014 Oct 3;25(39):395602. doi: 10.1088/0957-4484/25/39/395602. Epub 2014 Sep 11.
The synthesis of graphene (GR) from graphene oxide (GO) typically involves harmful chemical reducing agents that are undesirable for most practical applications. Here we report a green and facile synthesis method for the synthesis of GR that is soluble in water and organic solvents and that includes the additional benefit of adsorption of heavy metal ions. Acetylacetone, as both a reducing agent and a stabilizer, was used to prepare soluble GR from GO. Transmission electron microscopy and atomic force microscopy provide clear evidence for the formation of few-layer GR. The results from Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy show that reduction of GO to GR has occurred. Raman spectroscopy and X-ray photoelectron spectroscopy also indicate the removal of oxygen-containing functional groups from GO, resulting in the formation of GR. The results of dispersion experiments show that GR can be highly dispersed in water and N,N-Dimethylformamide. The reaction mechanism for acetylacetone reduction of exfoliated GO was also proposed. This method is a facile and environmentally friendly approach to the synthesis of GR and opens up new possibilities for preparing GR and GR-based nanomaterials for large-scale applications. Of even greater interest is that inductively coupled plasma atomic emission spectroscopy suggests that synthesized GR may be applied in the absorption of Cd(2+) and Co(2+) due to the strong coordination capacity of acetylacetone on the surfaces and edges of GR and the large surface area of GR in aqueous solutions. The maximum adsorptions are 49.28 mg g(-1) for Cd(2+), which is 4.5 times higher than that of carbon nanotubes, and 27.78 mg g(-1) for Co(2+), which is 3.6 times higher than that of titania beans.
由氧化石墨烯（GO）合成石墨烯（GR）通常需要使用有害的化学还原剂，这对于大多数实际应用来说是不可取的。在此，我们报告一种绿色且简便的GR合成方法，所合成的GR可溶于水和有机溶剂，并且还具有吸附重金属离子的额外优势。乙酰丙酮作为还原剂和稳定剂，用于从GO制备可溶性GR。透射电子显微镜和原子力显微镜为少层GR的形成提供了明确证据。傅里叶变换红外光谱和紫外可见光谱的结果表明，已发生了从GO到GR的还原。拉曼光谱和X射线光电子能谱也表明从GO中去除了含氧官能团，从而形成了GR。分散实验结果表明，GR可在水和N，N -二甲基甲酰胺中高度分散。还提出了乙酰丙酮还原剥离的GO的反应机理。该方法是一种简便且环境友好的GR合成方法，为大规模制备GR及基于GR的纳米材料开辟了新的可能性。更令人感兴趣的是，电感耦合等离子体原子发射光谱表明，由于乙酰丙酮在GR表面和边缘具有强大的配位能力以及GR在水溶液中的大表面积，合成的GR可应用于Cd(2+)和Co(2+)的吸附。对于Cd(2+)，最大吸附量为49.28 mg g(-1)，比碳纳米管高4.5倍；对于Co(2+)，最大吸附量为27.78 mg g(-1)，比二氧化钛豆高3.6倍。
