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Equilibrium Adsorption of Stilbenoids at Metal Oxides |
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11.02.2009 г. |
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Equilibrium Adsorption of Stilbenoids at Metal Oxides P. N. Kolotilov, K. E. Polunin, I. A. Polunina, and A. V. Larin Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia E-mail:
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Received February 02, 2008 Abstract — The isotherms of adsorption of trans-hydroxystilbenes (stilbenoids) and hydroxybenzenes (phenols) from n-hexane–ethyl acetate (1 : 1) at nanodispersed aerogels of aluminum and titanium oxides were measured under static conditions. The adsorption isotherms can be approximated well by the Freundlich equation for the model of localized adsorption at energetically heterogeneous solids. It was found that the adsorption value of both stilbenoids and phenols is improved with an increase in the number of OH groups in their molecules, being sensitive to the chemistry of the adsorbent surface. trans-Hydroxystilbenes adsorb at TiO2 better than do the corresponding phenols. The opposite pattern was observed for Al2O3. The adsorption of transhydroxystilbenes at TiO2 is irreversible and accompanied by the formation of colored surface compounds. PACS numbers: 68.43.-h DOI: 10.1134/S207020510901002X
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