Porosity of Some Iron(III), Chromium(III),
and Zirconium(IV) Hydroxide Oxide Xerogels

S. I. Pechenyuk, Yu. V. Ivanov, and Yu. P. Semushina

Tananaev Institute of Chemistry and Technology of Rare-Earth Technology and Mineral Resources,
Kola Scientific Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Russia

Received January 25, 2005

Abstract—Porosity and density in water are studied for xerogels prepared by drying iron(III), chromium(III),
and zirconium(IV) hydroxide oxide (HO) hydrogels. The hydrogels are either freshly precipitated at pH 7–11
or aged in sodium chloride or sodium sulfate solutions. The space distribution in the xerogels between the vol-
ume occupied by the constituent ions and the interstitial volume (spaces between metal–oxygen chains, meso-
pores, micropores, and macropores) is determined. The meso- and micropore volumes of the chromium(III) HO
xerogels are two to four times the volumes of iron(III) and zirconium(IV) HO xerogels. We suggest that the
microstructure of the chromium(III) HO hydrogels is almost fully inherited by their xerogels.

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