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Mechanism of adsorption of long-chain alkylamines on silicates: a spectroscopic study. 1. Quartz
Luleå University of Technology.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology.
Avdelningen för oorganisk kemi, Umeå universitet.
2000 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 16, no 21, p. 8071-8084Article in journal (Refereed) Published
Abstract [en]

The mechanism of adsorption of long-chain alkylamines at pH 6-7 onto quartz was studied using FTIR and XPS spectroscopy. The spectroscopic data were correlated with ζ potential and Hallimond flotation results. For the first time it was shown that (1) amine cation in the first monolayer is H-bonded with surface silanol group and this H-bond becomes stronger after the break in the adsorption characteristics (isotherm, ζ potential, floatability); (2) at the break the origin of the adsorbed amine species changes qualitatively, and along with alkylammonium ion attached to deprotonated silanol group, molecular amine appears at the surface and, as a result, monolayer thick patches of well-oriented and densely packed adsorbed amine species form rendering the surface highly hydrophobic; and (3) at higher amine concentration, bulk precipitation of molecular amine takes place. The counterion was found to influence both these steps. A model of successive two-dimensional and three-dimensional precipitation was suggested to explain amine adsorption on a silicate surface.

Place, publisher, year, edition, pages
2000. Vol. 16, no 21, p. 8071-8084
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-5813DOI: 10.1021/la000254yISI: 000089799900029Scopus ID: 2-s2.0-0342666227Local ID: 3ff9fab0-b132-11db-bf9d-000ea68e967bOAI: oai:DiVA.org:ltu-5813DiVA, id: diva2:978689
Note
Validerad; 2000; 20070131 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Rao, K. Hanumantha

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