Yang Yu, Chen Liang, Li De-Yuan, Yi Ruo-Bing, Mo Jia-Wei, Wu Ming-Hong, Xu Gang
Shanghai Applied Radiation Institute, Shanghai University Shanghai 200444 China
Department of Optical Engineering, Zhejiang A&F University Lin'an Zhejiang 311300 China
RSC Adv. 2019 Jan 25;9(7):3597-3604. doi: 10.1039/c8ra06797j.
The oxygen content of graphene oxide (GO) is directly related to its physical and chemical properties, such as hydrophilicity, suspension stability, adsorption, and ion-sieving ability of GO membranes. Here, a series of reduced GO (rGO) with C/O atomic ratios from 1.6 to 4.8 were prepared conveniently by electron-beam irradiation (EBI) with irradiation-dose control. Moreover, a single oxygen-containing group, , epoxy or carbonyl, could be retained mainly in the rGO. The interlayer spacing of rGO could be changed from 9.6 Å to 7.4 Å through control of the oxygen content. The prepared rGO exhibited an excellent adsorption effect on Pb(ii) ions, and the max adsorption capacity reached 194.76 mg g for rGO with a low irradiation dose (5 kGy), which showed that the ratio of oxygen-containing groups is important for improving the adsorption of rGO in aqueous solution. These results indicated that highly efficient, environmentally friendly, and advanced EBI technology has good potential prospects for use in the large-scale production of rGO with precise control of the oxygen content.
氧化石墨烯（GO）的氧含量与其物理和化学性质直接相关，如亲水性、悬浮稳定性、吸附性以及GO膜的离子筛分能力。在此，通过具有辐照剂量控制的电子束辐照（EBI）方便地制备了一系列C/O原子比为1.6至4.8的还原氧化石墨烯（rGO）。此外，单个含氧基团，即环氧基或羰基，可主要保留在rGO中。通过控制氧含量，rGO的层间距可从9.6 Å改变为7.4 Å。制备的rGO对Pb(ii)离子表现出优异的吸附效果，对于低辐照剂量（5 kGy）的rGO，最大吸附容量达到194.76 mg g，这表明含氧基团的比例对于提高rGO在水溶液中的吸附至关重要。这些结果表明，高效、环保且先进的EBI技术在精确控制氧含量的rGO大规模生产中具有良好的潜在应用前景。
