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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。
A novel gallic acid modified resin was prepared by postcrosslinking of chloromethylated styrene-divinylbenzene copolymer and chemical modification of gallic acid. The adsorption kinetics and thermodynamic behavior of gallic acid in aqueous solution were also investigated. The results showed that gallic acid modified resin has high specific surface area and abundant micropores, and has good adsorption properties for vanillin. The adsorption capacity decreases with the increase of temperature. The adsorption process can be fitted by quasi-first-order kinetic adsorption equation. The intra-particle diffusion is the main control step for the adsorption of vanillin by gallic acid resin. The adsorption of vanillin on gallic acid modified resin is an exothermic spontaneous process, which is mainly physical adsorption. The adsorption isotherms of Langmuir and Freundlich all fit well.