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利用改进的Hummers法制备氧化石墨烯(GO),将其与聚乙烯亚胺(PEI)发生交联反应得到三维GO/PEI复合材料,然后通过扫描电镜、傅里叶变换红外光谱和拉曼光谱对三维GO/PEI复合材料进行表征。利用静态吸附实验研究三维GO/PEI复合材料对六价铬的吸附性能。实验结果表明,三维GO/PEI复合材料为多孔结构,其表面具有丰富的官能团。平衡吸附时间为20h;六价铬的吸附容量随着pH值的减小而增大,在pH=2时吸附量达最大值为38.2 mg/g;吸附过程符合Langmuir等温吸附模型和准二级动力学模型;当温度为308 K时,吸附为自发的吸热过程。
Graphene oxide (GO) was prepared by a modified Hummers method and cross-linked with polyethyleneimine (PEI) to obtain three-dimensional GO / PEI composites. Scanning electron microscopy, Fourier transform infrared spectroscopy and Raman spectroscopy The 3D GO / PEI composites were characterized. Study on Adsorption of Hexavalent Chromium by Three Dimensional GO / PEI Composites by Static Adsorption Experiment. The experimental results show that the three-dimensional GO / PEI composite is porous and has abundant functional groups on its surface. The equilibrium adsorption time was 20h. The adsorption capacity of hexavalent chromium increased with the decrease of pH. The adsorption capacity reached 38.2 mg / g at pH = 2. The adsorption process accorded with Langmuir isothermal adsorption model and quasi-second stage Kinetic model; when the temperature is 308 K, the adsorption is a spontaneous endothermic process.