棉籽壳对木聚糖酶Pulpzyme HC的吸附机理  

Adsorption mechanism of cottonseed shell with xylanase Pulpzyme HC

作　　者：田利强[1] 胡映清[2] 聂华丽[2] 

机构地区：[1]陕西科技大学资源与环境学院,陕西西安710021 [2]东华大学化学化工与生物工程学院,上海201620

出　　处：《印染》2014年第12期1-6,共6页China Dyeing and Finishing

基　　金：国家自然科学基金资助项目(B060307);陕西科技大学博士科研启动基金(BJ13-27)

摘　　要：在不同温度下研究棉籽壳吸附木聚糖酶Pulpzyme HC的机理。结果表明,Freundlich模型最适合该吸附过程,说明棉籽壳对Pulpzyme HC的吸附呈不均匀立体表面的多分子吸附,是主动吸附。在吸附动力学方面,伪二级反应动力学模型拟合效果最佳;在吸附热力学方面,在所测温度下,ΔG°<0,说明该吸附过程是自发的,ΔH°<0,说明该吸附是放热反应。动力学与热力学模型证明,棉籽壳与Pulpzyme HC之间的吸附既存在物理吸附也存在化学吸附,且化学吸附是吸附过程的控速机制。The mechanism of cottonseed shell adsorbing xylanase { Pulpzyme HC） at different temperatures is investigated. The results show that Freundlich model is more suitable for the adsorption process. The model indicates that cottonseed shell presents multimolecular adsorption and active adsorption on the unevenly distributed surface. In the aspect of sorption kinetics, pseudo-second-order kinetic model is reasonable. As for the adsorption thermodynamics, △G°〈0 at the given temperature demonstrates the adsorption process is spontaneous. △H°〈0 indicates the process of cottonseed shell adsorbing Pulpzyme HC belongs to exothermic reaction. The kinetic and thermodynamics models also indicate both physical adsorption and chemical adsorption in the process of cottonseed shell adsorbing xylanase （ Pulpzyme HC） at the same time, and the chemisorption reaction is the main rate-control mechanism.

关 键 词：精练 棉籽壳 木聚糖酶 吸附 动力学 热力学 

分 类 号：O647.3[理学—物理化学]