Details
| Original language | English |
|---|---|
| Pages (from-to) | 4293-4303 |
| Number of pages | 11 |
| Journal | Journal of Physical Chemistry C |
| Volume | 121 |
| Issue number | 8 |
| Publication status | Published - 2 Mar 2017 |
Abstract
Herein we present a detailed report concerning the mode of surface interactions between imazapyr, 2-(4-methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl)pyridine-3-carboxylic acid, and the TiO 2 surface. Adsorption of imazapyr onto a TiO 2 film has been investigated in situ using attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The adsorption of imazapyr is pH dependent and occurs through electrostatic interactions and chemical bonding between the probe molecule and the charged TiO 2 surface involving different functional groups of imazapyr species present in solution. Based upon the ATR-FTIR spectra of imazapyr recorded at different pH values, it is concluded that the adsorption of imazapyr onto the TiO 2 surface is favored at pH values below the TiO 2's point of zero charge. Upon adsorption, the carboxylic acid group of imazapyr binds at surface Ti(IV) centers mainly as a bridging ligand at pH < pH zpc. With increasing pH values, the binding of imazapyr to the surface becomes less favorable. Furthermore, evidence is presented for additional contributions of other binding modes. Attempting to understand the influence of these interactions on the initial photocatalytic degradation rate of imazapyr, the results of this study confirm experimentally the aspects of the photocatalytic oxidation mechanism of imazapyr discussed previously on the basis of semiempirical calculations [Osajima et al. Monatshefte für Chemie - Chem. Mon. 2007, 139, 7-11, and Carrier et al. Appl. Catal. B Environ. 2006, 65, 11-20].
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- General Energy
- Chemistry(all)
- Physical and Theoretical Chemistry
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Journal of Physical Chemistry C, Vol. 121, No. 8, 02.03.2017, p. 4293-4303.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Surface Interactions between Imazapyr and the TiO2 Surface
T2 - An in Situ ATR-FTIR Study
AU - Atitar, M.F.
AU - Dillert, R.
AU - Bahnemann, D.W.
N1 - Publisher Copyright: © 2017 American Chemical Society. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/3/2
Y1 - 2017/3/2
N2 - Herein we present a detailed report concerning the mode of surface interactions between imazapyr, 2-(4-methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl)pyridine-3-carboxylic acid, and the TiO 2 surface. Adsorption of imazapyr onto a TiO 2 film has been investigated in situ using attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The adsorption of imazapyr is pH dependent and occurs through electrostatic interactions and chemical bonding between the probe molecule and the charged TiO 2 surface involving different functional groups of imazapyr species present in solution. Based upon the ATR-FTIR spectra of imazapyr recorded at different pH values, it is concluded that the adsorption of imazapyr onto the TiO 2 surface is favored at pH values below the TiO 2's point of zero charge. Upon adsorption, the carboxylic acid group of imazapyr binds at surface Ti(IV) centers mainly as a bridging ligand at pH < pH zpc. With increasing pH values, the binding of imazapyr to the surface becomes less favorable. Furthermore, evidence is presented for additional contributions of other binding modes. Attempting to understand the influence of these interactions on the initial photocatalytic degradation rate of imazapyr, the results of this study confirm experimentally the aspects of the photocatalytic oxidation mechanism of imazapyr discussed previously on the basis of semiempirical calculations [Osajima et al. Monatshefte für Chemie - Chem. Mon. 2007, 139, 7-11, and Carrier et al. Appl. Catal. B Environ. 2006, 65, 11-20].
AB - Herein we present a detailed report concerning the mode of surface interactions between imazapyr, 2-(4-methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl)pyridine-3-carboxylic acid, and the TiO 2 surface. Adsorption of imazapyr onto a TiO 2 film has been investigated in situ using attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The adsorption of imazapyr is pH dependent and occurs through electrostatic interactions and chemical bonding between the probe molecule and the charged TiO 2 surface involving different functional groups of imazapyr species present in solution. Based upon the ATR-FTIR spectra of imazapyr recorded at different pH values, it is concluded that the adsorption of imazapyr onto the TiO 2 surface is favored at pH values below the TiO 2's point of zero charge. Upon adsorption, the carboxylic acid group of imazapyr binds at surface Ti(IV) centers mainly as a bridging ligand at pH < pH zpc. With increasing pH values, the binding of imazapyr to the surface becomes less favorable. Furthermore, evidence is presented for additional contributions of other binding modes. Attempting to understand the influence of these interactions on the initial photocatalytic degradation rate of imazapyr, the results of this study confirm experimentally the aspects of the photocatalytic oxidation mechanism of imazapyr discussed previously on the basis of semiempirical calculations [Osajima et al. Monatshefte für Chemie - Chem. Mon. 2007, 139, 7-11, and Carrier et al. Appl. Catal. B Environ. 2006, 65, 11-20].
UR - http://www.scopus.com/inward/record.url?scp=85027245859&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.6b11673
DO - 10.1021/acs.jpcc.6b11673
M3 - Article
VL - 121
SP - 4293
EP - 4303
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 8
ER -