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Kinetics of collector adsorption on mineral surfaces
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0001-9794-8305
2005 (English)In: Centenary of flotation symposium / [ed] Graeme J. Jameson, The Australian Institute of Mining and Metallurgy , 2005, p. 433-437Conference paper, Published paper (Refereed)
Abstract [en]

In the present study infrared attenuated total reflection (IR-ATR) was used to monitor the rate of in situ adsorption of heptyl xanthate on a layer of zinc sulfide synthesised on a germanium ATR crystal. The zinc sulfide surface was characterised using x-ray photoelectron spectroscopy (XPS). The absorbance of heptyl xanthate measured increased with increasing bulk concentration of the adsorbate up to an equilibrium plateau value corresponding to a fractional coverage of the surface sites of the substrate. For the adsorption from solutions of concentrations between 10-3 and 10-5 M, the rate of adsorption increased with increasing bulk concentration. At higher concentrations the measured absorbance should be corrected for the absorbance due to the concentration of xanthate in bulk solution. The present work provides a discussion of this correction. Assuming the adsorption stage to be rate-controlling and proportional both to the concentration of the adsorbing species in solution and unreacted surface area, a rate law governing this type of transient adsorption kinetics was derived. By means of absorbance data for the concentrations 0.1 and 0.01 mM, die rate constant of adsorption was calculated. From the initial part of a Langmuir adsorption isotherm, the absorbance at monolayer coverage and the equilibrium constant of adsorption could be estimated.

Place, publisher, year, edition, pages
The Australian Institute of Mining and Metallurgy , 2005. p. 433-437
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-39165Local ID: dce14370-327f-11df-8e4b-000ea68e967bISBN: 1920806318 (print)OAI: oai:DiVA.org:ltu-39165DiVA, id: diva2:1012674
Conference
Centenary of Flotation Symposium : 06/06/2005 - 09/06/2005
Note
Godkänd; 2005; Bibliografisk uppgift: 1 CD-ROM; 20100318 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-04-05Bibliographically approved

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Fredriksson, AndreasHolmgren, AllanForsling, Willis

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