【摘要】 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。更多还原

【Abstract】 In this paper, the three-dimensional GO/PEI composite was fabricated from cross-linking polyethyleneimine(PEI) and graphene oxide(GO) prepared with improved Hummers method. The scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR) and Raman spectroscopy were used to characterize the three-dimensional GO/PEI composite. The adsorption ability of the three-dimensional GO/PEI composite for Cr(Ⅵ) was investigated using the static state absorption experiment. The results showed that the developed porous structure and plenty of functional groups were formed in the three-dimensional GO/PEI composite. The adsorption equilibration time was 20 h; the adsorption capacity of Cr(Ⅵ) increased with decreasing p H and reached 38.2 mg/g as p H is 2. Langmuir adsorption isotherm model and the pseudo-second kinetic model could well described adsorption process. When the temperature was 308 K, the adsorption was spontaneous and endothermic process.更多还原