摘要
目的:采用离子液体[Bmim]Cl水溶液对玉米芯进行预处理,探讨该吸附剂对废水中亚甲基蓝的吸附效果。方法:分别进行静态吸附动力学和热力学研究,采用准一级动力学方程、准二级动力学方程、Elovich和颗粒内扩散方程四种动力学经验方程对动力学过程进行分析;采用Freundlich、Langmuir、DR和Temkin四种吸附等温方程对热力学过程进行分析。结果:拟合结果表明,吸附过程符合准二级动力学方程,Langmuir等温吸附模型能够较好地描述玉米芯对亚甲基蓝吸附的热力学过程。此外,较高的温度有利于吸附,吸附过程为吸热过程。结论:经离子液体预处理后的玉米芯具有较好的吸附能力,吸附行为符合Langmuir吸附等温线,反应级数符合准二级反应动力学特征。
Objective:Corncob was pretreated with ionic liquid [Bmim]Cl aqueous solution.Then it was selected to adsorb methylene blue from aqueous solutions.Methods:The adsorption process was analyzed via four kinds of kinetic equations(Pseudo-first-order kinetic model,pseudo-second-order kinetic model,Elovich equation,and intra-particle diffusion equation)and four isotherm models(Freundlich,Langmuir,D-R and Temkin equations),respectively.Results:It shows that the process could be described well by pseudo-second-order kinetic and Langmuir isotherm items.In addition,the relatively higher temperature was conducive to the adsorption,suggesting that the process was endothermic.Conclusion:The corncob pretreated with ionic liquid still exhibited a good adsorption capacity.The adsorption be-havior was consistent with the Langmuir adsorption isotherm and the pseudo-second-order reaction kinetic.
作者
汪雁
李瑞阳
金光明
谢青松
祝梦婷
WANG Yan, LI Ruiyang, JIN Guangming, XIE Qingsong, ZHU Mengting(College of Life and Health Sciences, Anhui Science and Technology University, Fengyang 233100, Chin)
出处
《安徽科技学院学报》
2018年第1期64-71,共8页
Journal of Anhui Science and Technology University
基金
安徽科技学院人才引进项目(SKYJ201601)
安徽省大学生创新创业训练计划(201610879053)
国家级大学生创新创业训练计划(201710879031)
关键词
玉米芯
离子液体
亚甲基蓝
吸附
Corncob
Ionic liquid
Methylene blue
Adsorption