Chemistry, Physics and Technology of Surface, 2013, 4 (4), 358-365.

Surface Chemistry and Porosity of Natural and Activated Aluminosilicate from Montmorillonite and Clinoptilolite



DOI: https://doi.org/10.15407/hftp04.04.358

L. I. Belchinskaya, L. A. Novikova, V. Yu. Khokhlov, J. Lu Tkhi, M. T. Kartel

Abstract


Influence of acid and alkaline activation on the surface characteristics of natural combined aluminosilicate sorbent M45C20 containing montmorillonite and clinoptilolite components has been studied by means of IR-spectroscopy and isopiestic method. The shifts of absorption bands in the IR-spectra proved that both acid and alkaline treatment caused opening of Si–O–Al bonds followed by dealumination of sorbent and formation of groups Si–OH. The formation of amorphous phase of silica was observed upon acid treatment as a result of the destruction of octahedral layers of montmorillonite. Isotherms of water vapor sorption by natural M45C20 (MCnat) and activated M45C20 by acid and alkali (MCAc and MCAlk) have been studied. BET-theory was successfully applied for calculation of the specific surface area. The sorption capacity for water increases in the order: MCnat < MCAc < MCAlk. It has been found that the specific surface area of natural combined alumosilicate sorbent increases under acid and alkaline treatment by 1.3 and 1.5 times, respectively.

Keywords


aluminosilicate; activation; acid and alkaline treatment; surface characteristics

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DOI: https://doi.org/10.15407/hftp04.04.358

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