论文部分内容阅读
碳纳米管吸附氧氟沙星(OFL)是控制其在水体中归趋的一种有效方法.本研究讨论了多壁碳纳米管及其共混酸处理产物(MWCNTs和MWCNTs-O)对于氧氟沙星的吸附过程.考察了吸附动力学、吸附等温线、pH的影响和解吸过程.结果表明,吸附动力学曲线符合准二级动力学模型,OFL在MWCNTs-O上的平衡吸附量较大;Langmuir模型和Freundlich模型都能很好拟合吸附过程;pH在6.0~10.0时,平衡吸附量下降很快;解吸过程出现了解吸滞后现象,在MWCNTs-O上更为明显.吸附热力学分析表明OFL在碳纳米管上的吸附作用力为分子间作用力,MWCNTs-O上较多含氧官能团的引入为OFL分子的吸附提供了较多的吸附点,有利于OFL分子和碳纳米管之间形成相对作用力较强的氢键,该作用力主导了OFL在碳纳米管上的吸附,解释了试验现象.
Ofloxacin (OFL) adsorbed on carbon nanotubes is an effective method to control its fate in water.In this study, the effects of multiwalled carbon nanotubes (MWCNTs and MWCNTs-O) The adsorption kinetics, the adsorption isotherm, the pH and the desorption process were investigated.The results showed that the adsorption kinetics curve was in accordance with the quasi-second-order kinetic model, and the equilibrium adsorption capacity of OFL on MWCNTs-O was larger The Langmuir model and the Freundlich model fit well to the adsorption process. The equilibrium adsorption decreases rapidly when the pH is between 6.0 and 10.0. The desorption lag appears after desorption and is more obvious on the MWCNTs-O. The adsorption thermodynamic analysis The adsorption force of OFL on CNTs is the intermolecular force. The introduction of more oxygen-containing functional groups on MWCNTs-O provides more adsorption sites for the adsorption of OFL molecules, which facilitates the interaction between OFL molecules and carbon nanotubes The formation of a relatively strong hydrogen bond, the force dominated OFL adsorption on carbon nanotubes, explains the test phenomenon.