Adsorption Kinetics of Catechins onto Tea Stalk Lignocellulose

YE Jian-hui; JIN Jin; LIANG Hui-ling; LIANG Yue-rong

doi:10.13305/j.cnki.jts.2008.05.004

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Journal of Tea Science ›› 2008, Vol. 28 ›› Issue (5) : 313-318. DOI: 10.13305/j.cnki.jts.2008.05.004

Adsorption Kinetics of Catechins onto Tea Stalk Lignocellulose

YE Jian-hui, JIN Jin, LIANG Hui-ling, LIANG Yue-rong^*

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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 isotherm equation and characteristics of kinetics. The results showed that the Freundlich isotherm equation could be used to describe the adsorption of total catechins, and the adsorption capacities of total catechins decreased with the increase in temperature. The equations of pseudo-first-order model and pseudo-second-order model were used for the simulation of adsorption kinetic study. The kinetic results were more fitted to the pseudo-second-order model than the pseudo-first-order model. The saturated adsorption capacities on catechins calculated by the pseudo-second-order model were close to those of experimental data at different temperatures. With the increase in temperature, the rate constants of k₁and k₂are increased, while the initial adsorption rate of total catechins are decreased.

Key words

adsorption isotherm / adsorption kinetic / catechins / lignocellulose / tea stalk

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YE Jian-hui, JIN Jin, LIANG Hui-ling, LIANG Yue-rong. Adsorption Kinetics of Catechins onto Tea Stalk Lignocellulose[J]. Journal of Tea Science. 2008, 28(5): 313-318 https://doi.org/10.13305/j.cnki.jts.2008.05.004

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