Investigation of mechanochemically modified kaolinite surfaces by thermoanalytical and spectroscopic methods

Research output: Article

30 Citations (Scopus)

Abstract

The effect of mechanochemical activation (dry grinding), formamide intercalation, and thermal deintercalation on high- and low-defect kaolinite surfaces was studied by thermogravimetry and diffuse reflectance Fourier transform infrared spectroscopy. These investigations were completed with specific surface area and pore size distribution measurements. The surface acidity of the ground and the ground-and-intercalated kaolinites was probed with ammonia adsorption. The surface area and the pore volume as well as the amount of adsorbed ammonia increased with the rate of mechanochemical activation. At the same time the thermally deintercalated minerals showed increased surface area but decreased pore volume with the time of grinding. Adsorbed ammonia was detected as ammonium ion in the 1400-1500 cm-1 spectral range.

Original languageEnglish
Pages (from-to)523-529
Number of pages7
JournalJournal of Colloid and Interface Science
Volume317
Issue number2
DOIs
Publication statusPublished - jan. 15 2008

Fingerprint

Kaolin
kaolinite
Kaolinite
Ammonia
ammonia
grinding
porosity
Chemical activation
Defects
activation
Intercalation
Ammonium Compounds
Acidity
Specific surface area
Pore size
Fourier transform infrared spectroscopy
Minerals
defects
Thermogravimetric analysis
thermogravimetry

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

@article{68b58486aad74aa393527471b82015a8,
title = "Investigation of mechanochemically modified kaolinite surfaces by thermoanalytical and spectroscopic methods",
abstract = "The effect of mechanochemical activation (dry grinding), formamide intercalation, and thermal deintercalation on high- and low-defect kaolinite surfaces was studied by thermogravimetry and diffuse reflectance Fourier transform infrared spectroscopy. These investigations were completed with specific surface area and pore size distribution measurements. The surface acidity of the ground and the ground-and-intercalated kaolinites was probed with ammonia adsorption. The surface area and the pore volume as well as the amount of adsorbed ammonia increased with the rate of mechanochemical activation. At the same time the thermally deintercalated minerals showed increased surface area but decreased pore volume with the time of grinding. Adsorbed ammonia was detected as ammonium ion in the 1400-1500 cm-1 spectral range.",
keywords = "Adsorption, Infrared spectroscopy, Intercalation, Kaolinite, Mechanochemical activation, Thermal analysis",
author = "V. V{\'a}gv{\"o}lgyi and J{\'o}zsef Kov{\'a}cs and E. Horv{\'a}th and J. Krist{\'o}f and E. Mak{\'o}",
year = "2008",
month = "1",
day = "15",
doi = "10.1016/j.jcis.2007.09.085",
language = "English",
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journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "2",

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TY - JOUR

T1 - Investigation of mechanochemically modified kaolinite surfaces by thermoanalytical and spectroscopic methods

AU - Vágvölgyi, V.

AU - Kovács, József

AU - Horváth, E.

AU - Kristóf, J.

AU - Makó, E.

PY - 2008/1/15

Y1 - 2008/1/15

N2 - The effect of mechanochemical activation (dry grinding), formamide intercalation, and thermal deintercalation on high- and low-defect kaolinite surfaces was studied by thermogravimetry and diffuse reflectance Fourier transform infrared spectroscopy. These investigations were completed with specific surface area and pore size distribution measurements. The surface acidity of the ground and the ground-and-intercalated kaolinites was probed with ammonia adsorption. The surface area and the pore volume as well as the amount of adsorbed ammonia increased with the rate of mechanochemical activation. At the same time the thermally deintercalated minerals showed increased surface area but decreased pore volume with the time of grinding. Adsorbed ammonia was detected as ammonium ion in the 1400-1500 cm-1 spectral range.

AB - The effect of mechanochemical activation (dry grinding), formamide intercalation, and thermal deintercalation on high- and low-defect kaolinite surfaces was studied by thermogravimetry and diffuse reflectance Fourier transform infrared spectroscopy. These investigations were completed with specific surface area and pore size distribution measurements. The surface acidity of the ground and the ground-and-intercalated kaolinites was probed with ammonia adsorption. The surface area and the pore volume as well as the amount of adsorbed ammonia increased with the rate of mechanochemical activation. At the same time the thermally deintercalated minerals showed increased surface area but decreased pore volume with the time of grinding. Adsorbed ammonia was detected as ammonium ion in the 1400-1500 cm-1 spectral range.

KW - Adsorption

KW - Infrared spectroscopy

KW - Intercalation

KW - Kaolinite

KW - Mechanochemical activation

KW - Thermal analysis

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VL - 317

SP - 523

EP - 529

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 2

ER -