Advanced

Comparison of the adsorption of o-phthalate on boehmite (gamma-AlOOH), aged gamma-Al2O3, and goethite (alpha-FeOOH)

Persson, Per LU ; Nordin, J.; Rosenqvist, J.; Lovgren, L.; Ohman, L. O. and Sjoberg, S. (1998) In Journal of Colloid and Interface Science 206. p.252-266
Abstract
This work is concerned with the adsorption of o-phthalate (1,2-benzenedicarboxylate) at the water-metal (hydr)oxide interface. Previously published infrared spectroscopic, potentiometric, and adsorption data characterizing the boehmite (gamma-AlOOH) system are compared with new data collected for o-phthalate adsorption on aged gamma-Al2O3 and goethite (alpha-FeOOH). The study focuses on identifying bonding mechanisms, stoichiometries, and stabilities of the formed complexes, and comparing these among the three systems. Furthermore, the effects of ionic strength and composition of the ionic medium are investigated. The infrared spectroscopic data provided direct, molecular-level evidence for the existence of two dominating surface complexes... (More)
This work is concerned with the adsorption of o-phthalate (1,2-benzenedicarboxylate) at the water-metal (hydr)oxide interface. Previously published infrared spectroscopic, potentiometric, and adsorption data characterizing the boehmite (gamma-AlOOH) system are compared with new data collected for o-phthalate adsorption on aged gamma-Al2O3 and goethite (alpha-FeOOH). The study focuses on identifying bonding mechanisms, stoichiometries, and stabilities of the formed complexes, and comparing these among the three systems. Furthermore, the effects of ionic strength and composition of the ionic medium are investigated. The infrared spectroscopic data provided direct, molecular-level evidence for the existence of two dominating surface complexes on all three solids. One was shown to be a deprotonated outer-sphere species and the other was an inner-sphere surface complex. The inner-sphere complexes on the three solids were structurally related, and they were tentatively assigned to a mononuclear, chelating structure involving both carboxylate groups. The outer-sphere complexes were shown to increase in relative importance at high pH and low ionic strengths, while low pH and high ionic strengths favored the inner-sphere complexes. The information gained from the infrared spectroscopic investigations was used as qualitative input in the formulation of the surface complexation models. New models, based on the extended constant capacitance approach, were presented for the o-phthalate/aged gamma-Al2O3 and o-phthalate/goethite systems. (C) 1998 Academic Press. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Colloid and Interface Science
volume
206
pages
252 - 266
publisher
Elsevier
external identifiers
  • scopus:0032188737
ISSN
1095-7103
DOI
10.1006/jcis.1998.5668
language
English
LU publication?
no
id
d80424f2-8449-4641-b232-47bb2b888623 (old id 4332635)
date added to LUP
2014-03-04 09:43:45
date last changed
2017-01-01 04:59:21
@article{d80424f2-8449-4641-b232-47bb2b888623,
  abstract     = {This work is concerned with the adsorption of o-phthalate (1,2-benzenedicarboxylate) at the water-metal (hydr)oxide interface. Previously published infrared spectroscopic, potentiometric, and adsorption data characterizing the boehmite (gamma-AlOOH) system are compared with new data collected for o-phthalate adsorption on aged gamma-Al2O3 and goethite (alpha-FeOOH). The study focuses on identifying bonding mechanisms, stoichiometries, and stabilities of the formed complexes, and comparing these among the three systems. Furthermore, the effects of ionic strength and composition of the ionic medium are investigated. The infrared spectroscopic data provided direct, molecular-level evidence for the existence of two dominating surface complexes on all three solids. One was shown to be a deprotonated outer-sphere species and the other was an inner-sphere surface complex. The inner-sphere complexes on the three solids were structurally related, and they were tentatively assigned to a mononuclear, chelating structure involving both carboxylate groups. The outer-sphere complexes were shown to increase in relative importance at high pH and low ionic strengths, while low pH and high ionic strengths favored the inner-sphere complexes. The information gained from the infrared spectroscopic investigations was used as qualitative input in the formulation of the surface complexation models. New models, based on the extended constant capacitance approach, were presented for the o-phthalate/aged gamma-Al2O3 and o-phthalate/goethite systems. (C) 1998 Academic Press.},
  author       = {Persson, Per and Nordin, J. and Rosenqvist, J. and Lovgren, L. and Ohman, L. O. and Sjoberg, S.},
  issn         = {1095-7103},
  language     = {eng},
  pages        = {252--266},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {Comparison of the adsorption of o-phthalate on boehmite (gamma-AlOOH), aged gamma-Al2O3, and goethite (alpha-FeOOH)},
  url          = {http://dx.doi.org/10.1006/jcis.1998.5668},
  volume       = {206},
  year         = {1998},
}