College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
J Environ Sci (China). 2018 May;67:171-178. doi: 10.1016/j.jes.2017.08.022. Epub 2017 Sep 8.
A modified Hummer's method was adopted for the synthesis of graphene oxide (GO) and reduced graphene oxide (rGO). It was revealed that the modified method is effective for the production of GO and rGO from graphite. Transmission electron microscopy (TEM) images of GO and rGO showed a sheet-like morphology. Because of the presence of oxygenated functional groups on the carbon surface, the interlayer spacing of the prepared GO was higher than that of rGO. The presence of OH and CO groups in the Fourier transform infrared spectra (FTIR) spectrum and G-mode and 2D-mode in Raman spectra confirmed the synthesis of GO and rGO. rGO (292.6m/g) showed higher surface area than that of GO (236.4m/g). The prepared rGO was used as an adsorbent for benzene and toluene (model pollutants of volatile organic compounds (VOCs)) under dynamic adsorption/desorption conditions. rGO showed higher adsorption capacity and breakthrough times than GO. The adsorption capacity of rGO for benzene and toluene was 276.4 and 304.4mg/g, respectively. Desorption experiments showed that the spent rGO can be successfully regenerated by heating at 150.0°C. Its excellent adsorption/desorption performance for benzene and toluene makes rGO a potential adsorbent for VOC adsorption.
采用改进的 Hummer 法合成氧化石墨烯（GO）和还原氧化石墨烯（rGO）。结果表明，该改进方法可有效从石墨制备 GO 和 rGO。GO 和 rGO 的透射电子显微镜（TEM）图像显示出片状形态。由于碳表面存在含氧官能团，因此制备的 GO 的层间距高于 rGO。傅里叶变换红外光谱（FTIR）谱中 OH 和 CO 基团的存在以及拉曼光谱中的 G 模式和 2D 模式证实了 GO 和 rGO 的合成。rGO（292.6m/g）的比表面积高于 GO（236.4m/g）。在动态吸附/解吸条件下，将制备的 rGO 用作苯和甲苯（挥发性有机化合物（VOC）的模型污染物）的吸附剂。rGO 表现出比 GO 更高的吸附容量和穿透时间。rGO 对苯和甲苯的吸附容量分别为 276.4 和 304.4mg/g。解吸实验表明，用过的 rGO 可以在 150.0°C 加热成功再生。其对苯和甲苯的优异吸附/解吸性能使 rGO 成为 VOC 吸附的潜在吸附剂。
