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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
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, Ph, Cu, and Zn by a tochilinite-like material composed of alternating layers of Fe1-xS and Fe(OH)(2). The layers are thin, being of atomic dimension. The material was produced by chemical precipitation together with some magnetite, Fe3O4, 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, 1.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.
chemisorption, heavy metals, tochilinite, adsorption-desorption sulfate-reducing bacteria, structural aspects, alpha-transition, phase, fes
959-990
Watson, J.H.P.
e4f7e9d2-6299-4626-bc44-1ee8545899e6
Ellwood, D.C.
a7dc8f2a-f392-42b4-a022-fa5a58cf6be6
Cressey, B.A.
e470ca31-bfa7-42fd-b710-76ae0fe7010e
Lidzey, R.A.
ca6f5524-2f87-4823-a0bb-9f8194a988ec
Watson, J.H.P.
e4f7e9d2-6299-4626-bc44-1ee8545899e6
Ellwood, D.C.
a7dc8f2a-f392-42b4-a022-fa5a58cf6be6
Cressey, B.A.
e470ca31-bfa7-42fd-b710-76ae0fe7010e
Lidzey, R.A.
ca6f5524-2f87-4823-a0bb-9f8194a988ec

Watson, J.H.P., Ellwood, D.C., Cressey, B.A. and Lidzey, R.A. (2005) The adsorption of heavy metals by tochilinite, an iron sulfide material produced by chemical precipitation: analysis using a simple theory of chemisorption. Separation Science and Technology, 40 (5), 959-990. (doi:10.1081/SS-200051963).

Record type: Article

Abstract

This paper describes the adsorption of heavy metals Cd, Ph, Cu, and Zn by a tochilinite-like material composed of alternating layers of Fe1-xS and Fe(OH)(2). The layers are thin, being of atomic dimension. The material was produced by chemical precipitation together with some magnetite, Fe3O4, 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, 1.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.

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More information

Published date: 2005
Keywords: chemisorption, heavy metals, tochilinite, adsorption-desorption sulfate-reducing bacteria, structural aspects, alpha-transition, phase, fes

Identifiers

Local EPrints ID: 20928
URI: http://eprints.soton.ac.uk/id/eprint/20928
PURE UUID: 2916d5b9-80cf-4a21-afb9-c774c434d0a6

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Date deposited: 01 Mar 2006
Last modified: 05 Oct 2018 12:04

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