论文部分内容阅读
本文比较了不同碳纳米管(CNTs)对异甘草素和甘草素的吸附、解吸附性能。通过N_2吸附试验、扫描电镜和红外光谱对CNTs的孔径结构、比表面积、表面形态及载带官能团进行表征,经过动态吸附和等温平衡吸附、解吸附试验,结果表明:氧化多壁碳纳米管(o-MWCNTs)对两种化合物的吸附能力大于原始多壁碳纳米管(r-MWCNTs),尤其对异甘草素的吸附能力。吸附过程符合Freundlich模型,并且吸附能力随着温度的升高而逐渐降低。CNTs等温平衡吸附、解吸附试验结果显示,o-MWCNTs对异甘草素和甘草素的吸附能力大于r-MWCNTs,并且解吸附效率较好,对异甘草素和甘草素的解吸附率分别为48.57%和32.86%,而r-MWCNTs只有24.56%和17.46%。
In this paper, the adsorption and desorption properties of isoliquiritigenin and liquiritigenin by different carbon nanotubes (CNTs) were compared. The pore structure, specific surface area, surface morphology and functional groups of CNTs were characterized by N 2 adsorption, scanning electron microscopy and infrared spectroscopy. After dynamic adsorption and isothermal equilibrium adsorption and desorption experiments, the results showed that the oxidized MWCNTs o-MWCNTs) adsorb the two compounds more than the original multi-walled carbon nanotubes (r-MWCNTs), especially isoliquiritigenin. The adsorption process conforms to the Freundlich model, and the adsorption capacity decreases with increasing temperature. The results of isothermal equilibrium adsorption and desorption of CNTs show that the adsorption capacity of o-MWCNTs to isoliquiritigenin and liquiritigenin is greater than that of r-MWCNTs, and the desorption efficiency is better. The desorption rates of isoliquiritigenin and liquiritigenin are 48.57 % And 32.86% respectively, while r-MWCNTs only accounted for 24.56% and 17.46%.