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Chemistry and Industry of Forest Products ›› 2018, Vol. 38 ›› Issue (6): 95-102.doi: 10.3969/j.issn.0253-2417.2018.06.013

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Adsorption of Chlorogenic Acid from Eucommia ulmoides Leaves on ZSM-5 Molecular Sieve

LIU Yunlong, SONG Ke, XIAO Zhuobing, GUO Jie   

  1. Key Laboratory of Forest Chemical Engineering of Hunan Province, Jishou University, Zhangjiajie 427000, China
  • Received:2018-08-01 Online:2018-12-25 Published:2018-12-27

Abstract: The adsorption isotherm, kinetics and thermodynamics of chlorogenic acid in Eucommia ulmoides Oliv. leaves on ZSM-5 molecular sieve was investigated. Batch adsorption experiments revealed that the optimum solid-liquid ratio was 2:20 (g:mL) and pH value was 5. The amount of absorbed chlorogenic acid reached 2.075 mg/g at 40℃.The results of kinetics study showed that the behavior of adsorption of chlorogenic acid on the adsorbent of molecular sieve accorded with the pseudo-second-order kinetic model;the chemisorption played a major role in the adsorption process; and there existed three regions of the diffusion of chlorogenic acid molecules into the molecular sieve depicted from the plot of intraparticle diffusion model, which meant it contained the effects of intraparticle diffusion, external diffusion and boundary diffusion. The result of thermodynamics study showed that theisothermal adsorption curve was more consistent with the Freundlich model, indicating that the adsorption process took place on a heterogeneous surface corresponding to a multilayer adsorption mechanism; the process of adsorption was spontaneous, the enthalpy and entropy were 40.13 kJ/mol and 157.58 J/(mol·K), respectively, which meant endothermic and entropy increased during the adsoption process.

Key words: molecular sieve, chlorogenic acid, adsorption, dynamics, thermodynamics

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