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 k1 and k2 are increased, while the initial adsorption rate of total catechins are decreased.
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
.
DOI: 10.13305/j.cnki.jts.2008.05.004
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