三维GO/PEI复合材料的制备及其对六价铬的吸附  

Fabrication of three-dimensional GO/PEI composite and its adsorption for Cr(Ⅵ)

作　　者：王丽平[1,2] 张明瑜[2] 黄慧[1] 雷敏[1] 

机构地区：[1]长沙学院生物与环境工程系,湖南长沙410022 [2]中南大学粉末冶金研究院,湖南长沙410083

出　　处：《炭素技术》2016年第5期28-33,共6页Carbon Techniques

基　　金：国家自然科学基金(No.51404041);湖南省自然科学基金(No.2015JJ3016);长沙市科技计划(No.k1407017-11);中国博士后基金(No.2015M570690);中南大学博士后基金

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。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-dtimensional GO/PEI composite for CI（Vl） 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 pH and reached 38.2 mg/g as pH 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 endothermie proeess.

关 键 词：氧化石墨烯 改性 三维GO/PEI复合材料 吸附 

分 类 号：TB383[一般工业技术—材料科学与工程]