小麦秸秆对硝基苯的吸附动力学及热力学研究  

Study on kinetics and thermodynamics of nitrobenzene adsorption onto wheat straw

作　　者：吴荣东[1] 孙树林[1,2] 柏仇勇[3,4] 刘涛[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [3]河海大学土木与交通学院,江苏南京210098 [4]江苏省环保厅,江苏南京210098

出　　处：《应用化工》2012年第3期420-423,共4页Applied Chemical Industry

基　　金：江苏省环保科研课题项目(201029)

摘　　要：采用批量吸附实验考察了小麦秸秆对硝基苯的吸附动力学及热力学行为。吸附平衡时间约为60 min,且在前20 min是吸附急剧增加的第一阶段。吸附动力学行为符合拟二级动力学方程,拟二级动力学方程拟合曲线的决定系数均大于0.99,说明拟合程度很好。Langmuir和Freundlich吸附等温线都能较好地拟合吸附过程。吸附热力学结果表明,该反应是自发、吸热并且熵变增加的过程,温度升高有利于吸附反应的进行。Groups of experiments were designed to investigate the kinetics and thermodynamics of nitrobenzene adsorption onto wheat straw.The adsorption equilibration time is about 60 min.And within the first 20 min,there is a dramatic increase in uptake of NB.The process of nitrobenzene adsorption onto wheat straw was found to follow pseudo second-order kinetic model well.The coefficient of determination R2 are all over 0.99.The adsorption isotherm was fitted to the Langmuir and Freundlich adsorption isotherms well.The reaction of the adsorption of nitrobenzene onto wheat straw was a process which was spontaneous,endothermic accompanied by an increase in entropy.Therefore,raising temperature was beneficial to adsorption reaction.

关 键 词：硝基苯 小麦秸秆 吸附动力学 吸附热力学 

分 类 号：TQ209[化学工程—有机化工] TQ09