Paper Title:
The Effect of Anionic Sorption on the Metakaolinite
  Abstract

This paper reports an investigation on the effect of thermal activation of kaolinite. It is well known that during calcinations (400–650°C), kaolinite loses the OH lattice water and is transformed into metakaolinite or amorphous material. Arsenic is trace element that is toxic to animals including humans. The adsorption of arsenic on kaolinite was investigated at varying pH and thermal pretreatment. Calcination of sample is carried out at 650 °C for 3 h. The decomposition of kaolinite is recorded using methods of thermal analysis. The resultant product is identified by XRD. Laboratory experiments were conducted examining the effect of arsenic by thermally modified kaolinite. The Langmuir isotherm was used to describe arsenite and arsenate sorption by the calcined kaolinite. The equilibrium parameters used were based on experimental data obtained for the dynamic adsorption process of arsenic. Removal of arsenate using natural kaolinite was satisfactory, whereas arsenic was not removed by adsorption with thermally modified kaolinite. Moreover, the adsorption of arsenic by kaolinite and metakaolinite decreases with increasing pH.

  Info
Periodical
Materials Science Forum (Volumes 660-661)
Edited by
Lucio Salgado and Francisco Ambrozio Filho
Pages
1015-1018
DOI
10.4028/www.scientific.net/MSF.660-661.1015
Citation
V. Campos, L. C. Morais, A. H. Rosa, L. F. Fraceto, P. M. Büchler, "The Effect of Anionic Sorption on the Metakaolinite", Materials Science Forum, Vols. 660-661, pp. 1015-1018, 2010
Online since
October 2010
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