磁性离子交换树脂对模拟水中四环素的吸附特性研究

摘要

This paper studied the tetracycline adsorption behavior on Magnetic ion exchange resin by static experiments.The influence of different pH and tetracycline initial concentration on adsorption effect were investigated,adsorption isothermal models and kinetics were analyzed,and adsorption mechanism were illustrated.The result showed that Magnetic ion exchange resin has good adsorption effect for tetracycline.The kinetic studies indicated that the adsorption of tetracycline onto Magnetic ion exchange resin well described with pseudo-second-order kinetic model.Adsorption isotherm experiments suggested that Freundlich model is better than Langmuir model to describe the Magnetic ion exchange resin adsorption process of tetracycline.The D-R model showed that the process was mainly dominated by the ion exchange.The adsorbing effect of tetracycline under the neutral and acid condition is better.The adsorption of tetracycline on Magnetic ion exchange resin was spontaneous,endothermic and entropy increase process,the increase of temperature did benefit to the adsorption process.%采用静态实验研究了溶液中四环素在磁性离子交换树脂上的吸附行为,考察了反应物初始浓度,初始pH值等因素对吸附效果的影响,分析了吸附动力学、吸附等温线模型和吸附热力学,并阐明了吸附机制.结果表明:磁性离子交换树脂对四环素具有良好的吸附效果;准二级动力学模型能更好的描述磁性离子交换树脂对四环素的吸附过程;Freundlich模型更适合描述磁性离子交换树脂对四环素的吸附平衡过程,D-R模型说明吸附过程包含离子交换作用;中性和酸性条件下磁性离子交换树脂对四环素的吸附效果较好;磁性离子交换树脂吸附四环素是自发、吸热和熵增加的反应过程,升温有利于吸附.