Influence on the structure and methylene blue adsorption of graphite oxide prepared by three modified Hummers methods
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摘要: 采用三种改性Hummers法制备氧化石墨(GO-1、GO-2和GO-3),利用X射线衍射(X-ray diffraction,XRD)、傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FT-IR)、扫描电子显微镜(scanning electron microscopy,SEM)等多种分析手段对不同方法制备的氧化石墨的结构及性能进行表征,并研究了不同制备方法对氧化石墨吸附亚甲基蓝性能的影响。结果表明:氧化剂KMnO4用量的增加和低温氧化时间的增大有助于氧化石墨层间距的增大,其中氧化剂KMnO4用量对层间距的影响较大。氧化剂KMnO4用量的增多会导致含氧官能团的增多,导致氧化石墨表面形貌褶皱的增多,最终造成层间距的增大,但是当氧化剂KMnO4用量过多时,相邻表面的含氧官能团会发生交联,会造成氧化石墨的堆叠。GO-1对亚甲基蓝的去除效率比GO-2、GO-3分别高11.14%和23.21%,含氧官能团的增多有助于氧化石墨对亚甲基蓝的吸附。Abstract: Graphite oxide (GO) was prepared by three improved Hummers methods (GO-1, GO-2, and GO-3). The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM), and the effects of different preparation methods on the adsorption of methylene blue by GO were studied. The results indicate that, with the increase of oxidant KMnO4dosage and the extension of low temperature oxidation time, GO interlayer spacing gradually increases, in which the dosage of oxidant KMnO4has a greater influence on the interlayer spacing. The increase of oxidant KMnO4dosage will lead to the increase of oxygen-bearing functional groups and GO surface wrinkle, eventually resulting in an enlarge in the interlayer spacing. However, when the oxidant KMnO4is overdosed, the adjacent surface of oxygen-bearing functional groups will be cross-linked, resulting in the stack of GO. Compared with GO-2 and GO-3, the removal efficiency of GO-1 to methylene blue is higher than that of GO-2 and GO-3 by 11.14% and 23.21%, respectively, indicating that the increase in oxygen-bearing functional groups will contribute to the adsorption of methylene blue on GO.
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Key words:
- graphite oxide /
- Hummers methods /
- KMnO4 /
- methylene blue
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表 1 三种氧化石墨制备方法参数比较
Table 1. Preparation parameter comparison of graphite oxide in three improved Hummers methods
试样 KMnO4用量/ g 低温反应时间/ h 高温反应温度/ ℃ GO-1 8 6 80 GO-2 3 1 98 GO-3 6 17 98 注:表中KMnO4用量为单位质量石墨所对应的氧化剂KMnO4用量。 表 2 不同方法制备的氧化石墨的傅里叶变换红外光谱图数据(波数)
Table 2. FT–IR pattern data of GO prepared by different methods
cm-1 试样 –OH伸缩振动 C=O伸缩振动 H2O变形振动C=C伸缩振动 –OH面内弯曲振动 C–OH伸缩振动 C–O–C伸缩振动 苯的间位二取代弯曲振动 GO-1 3382 1738 1625 1287 1174 1008 881 GO-2 3188 1740 1643 1394 1079 ― ― GO-3 3419 1738 1648 1388 1100 ― ― -
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