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吸附等温线的测定对于研究GDX系列的吸附规律和探讨吸附机理具有重要的意义,等温线的形状可以反映出吸附剂的表面性质,孔分布性质以及吸附质与吸附剂相互作用的性质。 本文在以前工作的基础上采用间歇法和可见及紫外分光光度法测定了非极性GDX—203和弱极性GDX—301对苯胺、邻甲酚、苯甲酸、邻苯二甲酸二甲酯和亚甲基兰的吸附等温线。对亚甲基兰和邻苯二甲酸二甲酯的吸附在0—35ppm浓度范围内符合Freundlich等温方程式。苯胺、邻甲酚和苯甲酸的吸附等温线出现突跃和平台。两种GDX树酯的吸附等温线形状相似,吸附容量随溶液起始浓度的增加而增加,由于GDX微球小孔孔壁引力场的迭加,当平衡浓度达到一定限度时发生毛细孔内“凝聚”现象,吸附量急剧增加,吸附等温线出现突跃,实现结果表明GDX—203和GDX—301的吸附机理是一致的,树脂表面与被吸附的溶质分子之间的作用力主要是范德华力,属于物理吸附。
The determination of adsorption isotherms is of great significance for studying the adsorption rules of GDX series and discussing the adsorption mechanism. The shape of the isotherms can reflect the surface properties of adsorbents, pore distribution properties and the nature of the interaction between adsorbents and adsorbents. In this paper, based on the previous work, the intermittent method and visible and UV spectrophotometric determination of non-polar GDX-203 and weak polar GDX-301 on the aniline, o-cresol, benzoic acid, dimethyl phthalate and Methylene blue adsorption isotherm. Adsorption of methylene blue and dimethyl phthalate conforms to the Freundlich isotherm at a concentration range of 0-35 ppm. Aniline, o-cresol and benzoic acid adsorption isotherm and platform. The adsorption isotherms of the two GDX resins are similar in shape. The adsorption capacity increases with the initial concentration of the solution. Due to the superposition of the gravitational field of the GDX microspheres, when the equilibrium concentration reaches a certain limit, the capillary " The results show that the adsorption mechanism of GDX-203 and GDX-301 is consistent, and the interaction between the resin surface and the adsorbed solute molecules is mainly van der Waals forces , Belongs to the physical adsorption.