Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (4): 1000.doi: 10.7503/cjcu20120841

• Polymer Chemistry • Previous Articles     Next Articles

Adsorption Character of Polyvinyl Alcohol-grafted Particles for Flavonoids by Driving of Hydrogen Bond Interaction

ZHANG Yan-Yan, GAO Bao-Jiao, MEN Ji-Ying   

  1. Department of Chemical Engineering, North University of China, Taiyuan 030051, China
  • Received:2012-09-12 Online:2013-04-10 Published:2013-01-31

Abstract:

The adsorption characters of two kinds of flavonoids, quercetin and rutin, were conducted by polyvinyl alcohol(PVA)-grafted silica gel particles PVA/SiO2 as solid adsorbent. The research results show that the conventional hydrogen bond with multiple sites and π type hydrogen bond can be formed between the hydroxyl groups with high density on the surfaces of the functional composite particles PVA/SiO2 and the hydroxyl groups and the conjugated aromatic rings in the molecules of flavonoid compounds. The competing adsorption of the solvent will produce great negative effects on the adsorption capacity of the flavonoids. In 1,2-dichloroethane(DCE) as a weak polarity solvent, the competing adsorption of the solvent barely exists. Therefore, when DCE is used as solvent, quercetin and rutin have very high adsorption capacities, and they are 0.32 mmol/g(96 mg/g) and 0.23 mmol/g(140 mg/g), respectively. While in ethanol as a protic solvent, the adsorption capacities of quercetin and rutin decline greatly as a result of the strong competing adsorption of the solvent, and they are 0.22 mmol/g(65 mg/g) and 0.14 mmol/g(87 mg/g), respectively. Rising temperature will weaken the hydrogen bond interaction between the functional composite particles PVA/SiO2 and quercetin or rutin, and even makes the hydrogen bond rupture, leading to the decrease of the adsorption capacity. The existence of electrolytes in the protic solvent will influence the adsorption negatively. The adsorption process of the functional composite particles PVA/SiO2 for flavonoids is exothermic and driven by enthalpy.

Key words: Polyvinyl alcohol, Grafted particle, Flavonoid, Hydrogen bond interaction, Adsorption

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