酸性吸附树脂对2,6-二氯苯酚的吸附热力学和动力学研究  

STUDY ON THERMODYNAMICS AND KINETICS OF ADSORPTION OF 2,6-DICHLOROPHENOL BY ACID FUNCTIONAL GROUPS MODIFIED ADSORPTION RESIN

作　　者：刘总堂[1] 孙玉凤 费正皓[1] 王楠 方淳 陈梦艳 甘同雨 LIU Zongtang;SUN Yufeng;FEI Zhenghao;WANG Nan;FANG Chun;CHEN Mengyan;GAN Tongyu(Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresourcesand Environmental Protection, Yancheng Teachers University, Yancheng 224007, China;College of Chemistry and Chemical Engineering, Yancheng Teachers University Yancheng 224007, China)

机构地区：[1]江苏省滩涂生物资源与环境保护重点实验室盐城师范学院,江苏盐城224007 [2]盐城师范学院化学与环境工程学院,江苏盐城224007

出　　处：《离子交换与吸附》2018年第2期159-167,共9页Ion Exchange and Adsorption

基　　金：江苏省高等学校自然科学研究项目(17KJA610006和17KJB610013);江苏省滩涂生物资源与环境保护重点实验室开放课题(JKLBS2016003);盐城师范学院教学研究项目(16YCTCJY007)

摘　　要：本文以二硫代二苯甲酸、均苯四甲酸酐和没食子酸为修饰剂,通过后交联反应和化学修饰反应制备了3种酸性功能基修饰的超高交联树脂。通过等温吸附实验和吸附动力学实验,探讨了3种酸性吸附树脂对2,6-二氯苯酚(2,6-DCP)的吸附性能和吸附机制。结果表明,3种酸性吸附树脂对2,6-DCP均具有良好的吸附性能,吸附量随着2,6-DCP初始浓度的增大而增加,随着温度的升高而减小。Langmuir和Freundlich等温吸附方程均能够较好地拟合吸附等温线,3种酸性树脂对2,6-DCP的吸附机理较复杂。吸附热力学结果表明,吸附过程主要为放热、自发的物理吸附过程。3种酸性树脂对2,6-DCP的吸附动力学过程符合准一级动力学方程,颗粒内扩散是该吸附过程的主要控制步骤。3种酸性吸附树脂对2,6-DCP的吸附速率常数大小顺序为kGAMR>kDSTAMR>kPMDAMR。In this paper, 2,2-dithiodibenzoic acid modified hypercrosslinked resins （DSTAMR）, pyromellitic dianhydride modified hypercrosslinked resins （PMDAMR）, and gallic acid modified hypercrosslinked resins （GAMR） were prepared by postcrosslinking reaction and chemical modification reaction. The adsorption properties and mechanism of 2,6-DCP onto three acid adsorption resins were studied by the adsorption thermodynamics and kinetics. The results showed that three acid adsorption resins had good adsorption performances for 2,6-DCP. The adsorption capacities were increased with the increase of 2,6-DCP concentrations, and decreased as the temperature increased. Both Langmuir and Freundlich isothermal adsorption equations could fit the adsorption isotherms perfectly. The adsorption mechanism of 2,6-DCP onto three acid adsorption resins was complex. The adsorption thermodynamics results showed that the adsorption process was mainly an exothermic, spontaneous physical adsorption process. The adsorption kinetics of 2,6-DCP was in accordance with the Pseudo-first-order kinetic equation, and the intra-particle diffusion was the main control step of the adsorption process. The adsorption rate constants of the three acid adsorption resins for 2,6-DCP were in order of kGAMR 〉 kDs TAMR 〉 kpMDAMR.

关 键 词：酸性吸附树脂 化学修饰 2 6-二氯苯酚 吸附热力学 吸附动力学 

分 类 号：O647.32[理学—物理化学]