Adsorption of Organic Compounds from Aqueous Solutions
on a Silica Gel and -Alumina

N. V. Nikolenko*, I. B. Taran*, I. L. Plaksienko*, N. K. Vorob’ev**, and T. A. Oleinik**

* Ukrainian State University of Chemical Engineering, pr. Gagarina 8, Dnepropetrovsk, 320005 Ukraine
** Mekhanobrchermet, ul. Televisionnaya 3, Krivoi Rog, 324087 Ukraine

Received July 10, 1996

Abstract—Adsorption of 25 substituted aromatic and heterocyclic hydrocarbons from aqueous solutions was
studied by the static method in the concentration range 510⁴ to 110² M. It was found that the adsorption
of nitrogen-containing compounds is usually stronger than that of compounds with oxygen heteroatoms. The
adsorption parameters of the Langmuir isotherm for the amines adsorbed on a silica gel decrease in the follow
ing order: quinoline > picolines > pyridine > aniline > toluidine > -naphthylamine > aminopyridine > diphe
nylamine > indole > benzamide. Alumina extracts less organic compounds from the aqueous solutions than a
silica gel does. Additional n * absorption bands are observed in the electronic spectra of the adsorbed
molecules of quinoline, diphenylamine, aniline, and toluidine. Abnormally large shifts in the absorption bands
are discovered in the spectra of pyrogallol, pyrocatechol, and diphenylamine adsorbed on alumina. The conclu
sion is made that a silica gel in neutral aqueous solutions is a stronger electron donor and electron acceptor than
-alumina.

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