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Adsorption of o-phthalate at the water-boehmite (gamma-AlOOH) interface: Evidence for two coordination modes

Nordin, J.; Persson, Per LU ; Laiti, E. and Sjoberg, S. (1997) In Langmuir 13. p.4085-4093
Abstract
Complexation of o-phthalate (1,2-benzenedicarboxylate) at the water-boehmite (gamma-AlOOH) interface has been studied in 0.1 N NaCl media at 298.2 K within the range 4.0 < pH < 10.0. Equilibrium measurements were performed as potentiometric titrations and adsorption measurements. Attenuated total reflectance IR spectra were recorded to obtain structural information of the phthalate surface complexes. Additional adsorption and IR spectroscopic measurements were performed as a function of ionic strength. Infrared data strongly indicated the formation of two complexes at the surface, one outer-sphere and one inner-sphere complex with a chelating bidentate structure. The relative concentrations of these complexes were shown to vary with... (More)
Complexation of o-phthalate (1,2-benzenedicarboxylate) at the water-boehmite (gamma-AlOOH) interface has been studied in 0.1 N NaCl media at 298.2 K within the range 4.0 < pH < 10.0. Equilibrium measurements were performed as potentiometric titrations and adsorption measurements. Attenuated total reflectance IR spectra were recorded to obtain structural information of the phthalate surface complexes. Additional adsorption and IR spectroscopic measurements were performed as a function of ionic strength. Infrared data strongly indicated the formation of two complexes at the surface, one outer-sphere and one inner-sphere complex with a chelating bidentate structure. The relative concentrations of these complexes were shown to vary with ionic strength and pH. The potentiometric and adsorption data were modeled using the extended constant capacitance approach to describe the electrostatics at the water-boehmite interface. Furthermore, constraints from the infrared spectroscopic results were used in the model. The surface complexation model which provided the best fit to all experimental data included the following equilibria: =AlOH + HL- <-> =AlOH2+L2- (outer sphere); =Al(OH)(2) + H+ + HL- --> =AlL + 2H(2)O (inner sphere). (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
13
pages
4085 - 4093
publisher
The American Chemical Society
external identifiers
  • scopus:0031186704
ISSN
0743-7463
DOI
10.1021/la970066g
language
English
LU publication?
no
id
1cc12053-8d01-4581-9fb2-f1eeb133f239 (old id 4332659)
date added to LUP
2014-03-04 09:42:16
date last changed
2017-01-01 04:47:19
@article{1cc12053-8d01-4581-9fb2-f1eeb133f239,
  abstract     = {Complexation of o-phthalate (1,2-benzenedicarboxylate) at the water-boehmite (gamma-AlOOH) interface has been studied in 0.1 N NaCl media at 298.2 K within the range 4.0 &lt; pH &lt; 10.0. Equilibrium measurements were performed as potentiometric titrations and adsorption measurements. Attenuated total reflectance IR spectra were recorded to obtain structural information of the phthalate surface complexes. Additional adsorption and IR spectroscopic measurements were performed as a function of ionic strength. Infrared data strongly indicated the formation of two complexes at the surface, one outer-sphere and one inner-sphere complex with a chelating bidentate structure. The relative concentrations of these complexes were shown to vary with ionic strength and pH. The potentiometric and adsorption data were modeled using the extended constant capacitance approach to describe the electrostatics at the water-boehmite interface. Furthermore, constraints from the infrared spectroscopic results were used in the model. The surface complexation model which provided the best fit to all experimental data included the following equilibria: =AlOH + HL- &lt;-&gt; =AlOH2+L2- (outer sphere); =Al(OH)(2) + H+ + HL- --&gt; =AlL + 2H(2)O (inner sphere).},
  author       = {Nordin, J. and Persson, Per and Laiti, E. and Sjoberg, S.},
  issn         = {0743-7463},
  language     = {eng},
  pages        = {4085--4093},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Adsorption of o-phthalate at the water-boehmite (gamma-AlOOH) interface: Evidence for two coordination modes},
  url          = {http://dx.doi.org/10.1021/la970066g},
  volume       = {13},
  year         = {1997},
}