FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (11): 122-125.doi: 10.7506/spkx1002-6630-201311027

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A Kinetic Model for Adsorption Characteristics of Tannic Acid from Chinese Gall “Beihua” on Macroporous Resin

OUYANG Yu-zhu,ZHANG Ci-hai,WEI Yan   

  1. Institute of Food Science, Jishou University, Jishou 416000, China
  • Received:2012-04-28 Revised:2013-03-06 Online:2013-06-15 Published:2013-06-03

Abstract:

The adsorption behavior of tannic acid from Chinese gall “Beihua” on D-101 macroporous polymeric resin was
studied using static adsorption experiments. Some adsorption characteristics was investigated based on the pseudo-?rst-order,
pseudo-second-order and particle diffusion kinetics model, and thermodynamic parameters for the adsorption of tannic acid
were determined using the Van’t Hoff equation. The results showed that the adsorption process followed a pseudo-second-order
kinetic equation. The mutual effects of boundary layer diffusion and intraparticle diffusion on the adsorption of tannic acid on
D-101 resin were determined. Langmuir isothermal adsorption equation was successfully employed to describe the adsorption
of tannic acid on the macroporous resin. This process was physical adsorption with adsorption enthalpy of 5.5 kJ/mol.

Key words: Chinese gall &ldquo, Beihua&rdquo, ;tannic acid;macroporous adsorption resin;kinetics;thermodynamics

CLC Number: