【作者】 叶俭慧； 梁月荣；

【Author】 YE Jianhui,LIANG Yuerong (Tea Research Institute,Zhejiang University,Hangzhou 310029,China)

【机构】 浙江大学茶叶研究所；

【摘要】 以茶梗为原料制备木质纤维素,通过静态吸附,研究茶梗木质纤维素在绿茶提取物溶液中对儿茶素类的吸附动力曲线、吸附等温曲线和热力学参数。结果表明,当温度从288K升高至308K时,茶梗木质纤维素对总儿茶素类的吸附平衡时间从180min提前至90min,同时儿茶素的吸附容量降低。茶梗木质纤维素对儿茶素类总量和咖啡因的吸附等温线符合Langmuir模型,且总儿茶素的qm和Kb均大于咖啡因,说明茶梗木质纤维素对儿茶素类具有更强的吸附亲和力。热力学研究表明,茶梗木质纤维素对总儿茶素类和咖啡因的吸附行为均属于自发的物理过程。更多还原

【Abstract】 Lignocelluloses prepared from woody tea stalk was used to adsorb tea catechins from green tea extract solution by static adsorption,focusing on the study of adsorption dynamics,isotherm equation and thermodynamic parameters.The results showed that with the temperature increasing from 288K to 308K,the adsorption equilibrium time was advanced from 180 min to 90 min,and the adsorption capacity of total catechins decreased.The Langmuir isotherm equation was fit to describe the adsorption of total catechins and caffeine,and the both adsorption process was spontaneous physisorption.更多还原