摘要：

由于羧基化碳纳米管孔径结构和表面性质在制备过程中具有广泛的可调控性,通过聚乙烯亚胺(PEI)对其进行化学改性和表面修饰。系统地研究了改性碳纳米管(PEI-CNT/COOH)与污染物吸附特性之间的关系。实验证实PEI-CNT/COOH对甲基橙的吸附符合假二阶方程与Langmuir等温吸附模型。通过研究热力学参数证实PEI-CNT/COOH对甲基橙的吸附是一个自发放热过程。25℃下,PEI-CNT/COOH对甲基橙的吸附量为1 218.8 mg/g,远远高于未改性CNT/COOH对甲基橙的吸附量(466.6 mg/g)。

关键词: 改性, 羧基碳纳米管, 甲基橙, 吸附

Abstract:

Since the aperture structure and surface properties of carboxyl carbon nano-tubes are controllable in the preparation process,its chemical modification and surface embellishment have been implemented with polyethylen-emine(PEI). The relationship between modified carboxyl carbon nano-tubes(PEI-CNT/COOH) and pollutant adsorption characteristics is studied systematically. The results confirms that the adsorption capacity for methyl orange complies well with the pseudo-second-order model and Langmuir isothermal adsorption model. In addition,the thermodynamics parameters indicate that the process is spontaneous and exothermic course. The maximum adsorption capacity for MO is 1 218.8 mg/g at 25℃,which is much higher than that of non-modified carboxyl carbon nano-tube(466.6 mg/g).

Key words: modification, carboxyl carbon nano-tube, methyl orange, adsorption

中图分类号: 

• X703.1