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Chemistry for Sustainable Development

2002 year, number 3

Preparation, Texture Parameters and Adsorption Properties of Fe-Montmorillonite

MARINA A. SHCHAPOVA1, SVETLANA TS. KHANKHASAEVA1, ANATOLY A. RYAZANTSEV2,AGNIYA A. BATOEVA1 and SAYANA V.
1Baikal Institute of Natura Management, Siberian Branch of the Russian Academy of Sciences,
Ul. Sakh'yanovoy 6, Ulan-Ude 670047 (Russia), E-mail: shan@binm.baikal.net
2Siberian Transport University, Ul. D. Koval'chuk 191, Novosibirsk 630049 (Russia)
E-mail: raastu@online.sinor.ru
Pages: 347-354

Abstract

Layer-pillar pore structured samples of Fe-montmorillonite (Fe-MM) have been obtained through modifying of bentonite by mono- and binuclear iron (III) hydroxocomplexes. The influence of conditions of synthesis and thermal treatment on samples properties has been studied. Texture characteristics obtained through N2 adsorption measurement at 77 K and X-ray phase analysis results bear witness to formation of great number of mesopores and large interparticle lacunas generated both at the expense of random arrangement of short layer-pillar pore structured regions, and through sintering of clay particles on calcining. Adsorption properties of Fe-MM are determined from extinction of phenols and dyes aqueous solutions. Form of isotherms (S-type for phenol, L-type for resorcin and hydroquinone) allows to argue that phenols adsorption takes place mainly at the surface of Fe-MM and is due to dispersion forces action. Methylene blue cationic dye is adsorbed both on the Fe-MM surface and in the interlayer space by use of ion-exchange centers remaining active, as well as micropores produced from pillarization. Since the sorbent surface is appreciably dehydroxilated and contains small quantity of active groups capable of holding large associates of anionic dyes, the adsorption of last mentioned occurs largely in secondary mesopores produced on calcining of Fe-MM samples.