碳纳米管的化学修饰及其对银离子吸附性能的研究

摘要

笔者研究了碳纳米管的化学修饰及其对银离子吸附性能,同时考察了振荡时间、温度、碳纳米管用量等因素对吸附性能的影响.实验结果表明:修饰的碳纳米管对银离子的吸附效果明显高于未修饰的碳纳米管,当其用量为0.004.g时,在1.mL浓度为10.mg/L的硝酸银溶液中,未修饰的碳纳米管对银离子的去除率达到47.9％,修饰的碳纳米管对银离子的去除率达到99.3％;修饰的碳纳米管对银离子的吸附在40.min时达到平衡,而未修饰的碳纳米管在50.min时达到平衡;随着温度的升高,修饰的和未修饰的碳纳米管对银离子的吸附都有所下降.平衡吸附量qe与平衡浓度Pe之间的关系基本符合Freundlich和Langmuir等温吸附方程所描述的规律.%The contrast moving effect of the modified carbon nanotubes and the impurified carbon nanotubes adsorption removal performance for silver ions was investigated.Some effect factors were also studied.Such as the adsorption time, temperature, the dosage of carbon nanotubes.The result show that the adsorption behavior of modified carbon nanotubes on Ag+ was much better than that of the impurified ones.First, carbon nanotubes were modified.When dropping 0.004.g(Ag+solution 10.mg/L), 99.3% of Ag+ was adsorbed, while only 47.9% was adsorbed with impurified MWNTS.The adsorption of Ag+ reached balance 40.minutes later.Temperature had a litter effect on the removal of Ag+.Higher temperature was litter useful for removal.The relationship between adsorbing (qe) and equilibrium mass concentration (pe) was just in accordance with the isothermal adsorption equations of freundlich and langmuir.