Effect of acid and alkaline treatment on physicalchemical properties of surface of natural glauconite

Authors

  • Victoria V. Krupskaya PhD in geological and mineralogical sciences, Laboratory of crystal chemistry of minerals, Institute of geology of ore deposits, petrography, mineralogy and geochemistry of Russian Academy of Sciences, senior research fellow; Moscow, Russian Federation; krupskaya@ruclay.com
  • Liudmila A Novikova PhD in chemical sciences, associate professor, department of chemistry of FSBEI HE «Voronezh State University of Forestry and Technologies named after G.F.Morozov», associate professor; Voronezh, Russian Federation; novikovla@yandex.ru
  • Alexander V. Zhabin PhD in geological and mineralogical sciences, department of general geology and geodynamics, FSBEI HE «Voronezh State University», associate professor, Voronezh, Russian Federation; zhabin01@mail.ru
  • Larisa Ivanovna Belchinskaya full professor in technical sciences, professor, department of chemistry of FSBEI HE «Voronezh State University of Forestry and Technologies named after G.F.Morozov», chairwoman, professor; Voronezh, Russian Federation; chem@vglta.vrn.ru
  • Frank Roessner full professor in chemical sciences, professor, department of industrial chemistry at the Carl von Ossietzky University of Oldenburg, chair, professor; Oldenburg, Germany; frank.roessner@uni-oldenburg.de

DOI:

https://doi.org/10.17308/sorpchrom.2015.15/327

Keywords:

natural glauconite, acid/alkaline activation, surface and characterization, surface active sites, catalytic conversion of methylbutynol

Abstract

Physical-chemical properties of the structure and the surface of natural (Glt-Nat) and modified by
2M H2SO4 (Glt-Ac); 2M NaOH (Glt-Alk) aluminosilicate samples containing glauconite were studied by
means of XRD, SEM, BET-methods and catalytic conversion of methylbutynol (MBOH). It was observed
that investigated sample was a mixture of mixed layered minerals of illite-smectite (I-S) series, having a I:S
ratio of 50:50 and 80:20. The content of the mixed-layer mineral phase (I:S=50:50) changed as follows: 30-
35% for Glt-Nat; 20-25% for Glt-Ac and 10-15% for Glt-Alk. The elemental composition did not
significantly change after both types of treatment, whereas a twofold increase in specific surface area of GltAc
was observed. The catalytic conversion of MBOH after 10 min of reaction changed in the order: Glt-Ac
(25.4%) > Glt-Nat (23.5%) > Glt-Alk (5.7%). The product yields distribution confirmed presence of both
acid and basic sites on the surface, with the major contribution of acid sites. According to experimental yields
of products formed over acid pathway of the reaction, acidity of unit surface area varied in the order: Glt-Nat
> Glt-Ac > Glt-Alk. The chemical modification of natural sample caused an alteration of its surface
acidity/basicity as observed from the ratio (Ra/b values) of product yields normalized per unit area of surface.
The highest Ra/b was found for Glt-Ac (97.5), which was 3 times higher as for Glt-Nat (33.1) and 7.7 times
that for Glt-Alk (12.6).

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Published

2018-02-20

Issue

Vol. 15 No. 5 (2015): Sorption and chromatographic processes

Section

Статьи

How to Cite

Effect of acid and alkaline treatment on physicalchemical properties of surface of natural glauconite. (2018). Sorbtsionnye I Khromatograficheskie Protsessy, 15(5), 730-740. https://doi.org/10.17308/sorpchrom.2015.15/327

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