The Adsorption of Heavy Metals by Tochilinite, an Iron Sulfide Material Produced by Chemical Precipitation: Analysis Using a Simple Theory of Chemisorption

The Adsorption of Heavy Metals by Tochilinite, an Iron Sulfide Material Produced by Chemical Precipitation: Analysis Using a Simple Theory of Chemisorption

This paper describes the adsorption of heavy metals Cd, Pb, Cu, and Zn by a tochilinite-like material composed of alternating layers of Fe 1−x S and Fe(OH) 2 . The layers are thin, being of atomic dimension. The material was produced by chemical precipitation together with some magnetite, Fe 3 O 4 ,...

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Bibliographic Details
Published in:Separation science and technology Vol. 40; no. 5; pp. 959 - 990
Main Authors: Watson, J. H. P., Ellwood, D. C., Cressey, B. A., Lidzey, R. A.
Format: Journal Article
Language:English
Published: Taylor & Francis Group 01-01-2005
Subjects:
Adsorption-desorption
Chemisorption
Heavy metals
Tochilinite
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Summary:This paper describes the adsorption of heavy metals Cd, Pb, Cu, and Zn by a tochilinite-like material composed of alternating layers of Fe 1−x S and Fe(OH) 2 . The layers are thin, being of atomic dimension. The material was produced by chemical precipitation together with some magnetite, Fe 3 O 4 , which renders the material magnetic. The results were analyzed with a simple chemisorption model which contained two parameters g(=mass of the heavy metal adsorbed/mass of adsorbent added) and C, a kinetic term with dimensions, l.mg −1 .h −1 ., h is the time elapsed in hours. The fitting procedure works well with values of g>1, in some cases. However, according to the simple theory g and C should be constant independent of M A , the mass of adsorbent added: the constancy predicted was not observed. From the variation of g and C with M A the conclusion was that for a more complete understanding of the adsorption process, in addition to chemisorption adsorption-desorption processes must be included. We wish to acknowledge the help of Mr. Harry Childs, sadly, now deceased, who funded much of this work and who financially supported RGL. We also wish to acknowledge useful conversations with Dr. G.J. Daniell (University of Southampton) on the statistical methods used in this work and S.J.P. Watson for discussions on the subject of chemisorption.
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ISSN:0149-6395
1520-5754
DOI:10.1081/SS-200051963