Adsorption Mechanism for 2‐Methylpyridine on Hypercross‐linked Fibers

Two types of novel hypercross‐linked fiber adsorbents, ZH‐01 and ZH‐02, were prepared by cross‐linking PP‐ST‐DVB fibers in solution with p‐xylylenedichloride and monochloromethylether according to the Friedel‐Crafts reaction. A series of static adsorption tests were performed. The results showed that the adsorbents have excellent adsorption capacities for 2‐methylpyridine and the adsorption equilibrium data can be fitted well by the Freundlich model. The thermodynamic studies supported the conclusion that the mechanism of adsorption for 2‐methylpyridine on the adsorbents is physical adsorption and a lower temperature is favorable to the exothermic physisorption process. In addition, kinetic studies were also carried out. The hypercross‐linked fiber adsorbents showed a faster adsorption rate than the base PP‐ST‐DVB fiber. The faster attainment of adsorption equilibrium for 2‐methylpyridine on the adsorbents (within 2 h), is advantageous for practical use. A first‐order reaction rate equation was assumed for the adsorption system and was suitable to describe the process. The equilibrium rate constants of the adsorbents correlated well with their adsorption capacities.