没食子酸修饰树脂吸附香兰素动力学与热力学行为  

Kinetics and thermodynamics of adsorption of vanillin onto resin modified by gallic acid

作　　者：孙玉凤[1,2] 刘总堂[1] 费正皓[2] 仇立干[2] 陈建[2] 沙新龙[2] 

机构地区：[1]江苏省滩涂生物资源与环境保护重点建设实验室盐城师范学院,江苏盐城224002 [2]盐城师范学院化学化工学院,江苏盐城224002

出　　处：《计算机与应用化学》2014年第7期817-820,共4页Computers and Applied Chemistry

基　　金：国家自然科学基金(21307103);江苏省高校自然科学研究项目(13KJB150038);江苏省高等学校大学生创新训练计划(201310324065X);盐城市农业科技指导性计划项目(YKN2013016和YKN2013015)

摘　　要：通过氯甲基化的苯乙烯-二乙烯苯共聚物的后交联及没食子酸的化学修饰反应制备了新型没食子酸修饰树脂,并探讨其对水溶液中香兰素的吸附动力学和热力学行为。研究结果表明,没食子酸化学修饰树脂具有较高的比表面积和较丰富的微孔,对香兰素具有良好的吸附性能,吸附量随着温度的升高而下降。吸附过程可用准一级动力学吸附方程进行拟合,颗粒内扩散是没食子酸修饰树脂吸附香兰素过程的主要控制步骤。香兰素在没食子酸修饰树脂上的吸附为放热的自发过程,以物理吸附为主。Langmuir和Freundlich吸附等温方程均能够较好地拟合吸附等温线。In this study, a new kind of hypercrosslinked resin was prepared by post-crosslinking of chloromethylated polystyrene-divinyl benzene and subsequent chemically modifying with gallic acid. It was used as adsorbent for adsorption of vanillin in aqueous solution and the adsorption kinetics and thermodynamics were carried out. The experimental results showed that hypercrosslinked resin modified by gallic acid had good adsorption capabilities for vanillin because of the high specific surface area and relatively abundant micropore distribution. The adsorptive capacities of vanillin decreased as the adsorption temperature increased. The adsorption process of vanillin on hypercrosslinked resin modified by gallic acid obeyed pseudo-first order kinetic equation and the inner diffusion of the particles was the major rate controlling step of adsorption process. The values of adsorption enthalpy change were all negative, which indicates that the adsorption process was an exotbermic physical adsorption process. In addition, the negative values of free energy change showed that all these adsorption process was spontaneous. The adsorption isotherm could be fitted well by Langmuir and Freundlich adsorption isothermal equation.

关 键 词：香兰素 没食子酸 化学修饰 动力学 热力学 

分 类 号：O647.3[理学—物理化学]