The influence of acid treatment on the nanostructure and textural properties of bentonite clays
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2005
Authors
Vuković, ZoricaMilutinović Nikolić, Aleksandra

Krstić, Jugoslav

Abu Rabi, Andjela
Novakovic, T
Jovanović, Dušan M.
Article (Published version)

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The nanostructure and textural properties of acid-activated bentonite clays from the Bogovina coalmine were investigated. The acid activation was performed with HCl in the concentration range 1.5-7.5 M. The atomic force microscopy followed by image analysis was used in order to establish the influence of the acid treatment on the size of bentonite particles. Nitrogen adsorption-desorption isotherms at -196 degrees C were used to estimate the specific surface area, pore volume and pore size distribution. The acid treatment reduces the size of bentonite particles and increases the specific surface area and pore volume of the investigated bentonites. These effects are improved by increasing the acid concentration up to 4.5 M HCl Further increase in acid concentration does not result in development of new porous structure.
Keywords:
acid activation / bentonite / nanostructure / textural propertiesSource:
Current Research in Advanced Materials and Processes, 2005, 494, 339-344Publisher:
- Trans Tech Publications Ltd, Durnten-Zurich
DOI: 10.4028/www.scientific.net/MSF.494.339
ISSN: 0255-5476