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
(2000) In Langmuir 16. p.5719-5729- Abstract
- 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 (alpha-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... (More)
- 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 (alpha-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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4332614
- author
- Boily, J. F. ; Nilsson, N. ; Persson, Per LU and Sjoberg, S.
- publishing date
- 2000
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 16
- pages
- 5719 - 5729
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:0034205995
- ISSN
- 0743-7463
- DOI
- 10.1021/la991407o
- language
- English
- LU publication?
- no
- additional info
- 13
- id
- 23784379-ab6a-4a4b-b0e3-1de7555f6fa1 (old id 4332614)
- date added to LUP
- 2016-04-01 12:16:39
- date last changed
- 2022-01-27 01:23:03
@article{23784379-ab6a-4a4b-b0e3-1de7555f6fa1, abstract = {{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 (alpha-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.}}, author = {{Boily, J. F. and Nilsson, N. and Persson, Per and Sjoberg, S.}}, issn = {{0743-7463}}, language = {{eng}}, pages = {{5719--5729}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Langmuir}}, title = {{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}}, url = {{http://dx.doi.org/10.1021/la991407o}}, doi = {{10.1021/la991407o}}, volume = {{16}}, year = {{2000}}, }