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Benzenecarboxylate surface complexation at the goethite (alpha-FeOOH)/water interface: I. A mechanistic description of pyromellitate surface complexes from the combined evidence of infrared spectroscopy, potentiometry, adsorption data, and surface complexation modeling
Umeå Universitet.
Umeå Universitet.
Umeå Universitet.ORCID iD: 0000-0001-9172-3068
Umeå Universitet.
2000 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 16, no 13, p. 5719-5729Article in journal (Refereed) Published
Abstract [en]

An investigation combining IR spectroscopy, potentiometric titrations, and adsorption experiments was carried out to study pyromellitate (1,2,4,5-benzenetetracarboxylate) sorption at the goethite (α-FeOOH)/water interface. The IR spectra show evidence of outer-sphere complexation throughout the pH range from 3 to 9. Below pH 6 additional IR spectroscopic features appear, which are tentatively assigned to inner-sphere complexes. A normalized IR peak area plot for each peak indicative of inner- and of outer-sphere complexes as a function of pH provided a semiquantitative surface speciation scheme. This scheme was successfully reproduced using surface complexation theory with a multisite complexation model calibrated on potentiometric titration and on adsorption data. The surface speciation was described with a binuclear outer-sphere complex on the {110} plane of goethite and a mononuclear inner-sphere complex on the {001} plane. Furthermore, as the IR spectra also indicated partial protonation of pyromellitate complexes at low pH, a partially protonated outer-sphere species on the {110} plane was included in the model.

Place, publisher, year, edition, pages
2000. Vol. 16, no 13, p. 5719-5729
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:miun:diva-34490DOI: 10.1021/la991407oISI: 000087800300035OAI: oai:DiVA.org:miun-34490DiVA, id: diva2:1250891
Available from: 2018-09-25 Created: 2018-09-25 Last updated: 2018-09-25Bibliographically approved

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