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Titolo:
AN INFRARED SPECTROSCOPIC STUDY OF CARBONATE ADSORPTION TO ZIRCONIUM DIOXIDE SOL-GEL FILMS FROM AQUEOUS-SOLUTIONS
Autore:
DOBSON KD; MCQUILLAN AJ;
Indirizzi:
UNIV OTAGO,DEPT CHEM,POB 56 DUNEDIN NEW ZEALAND UNIV OTAGO,DEPT CHEM DUNEDIN NEW ZEALAND
Titolo Testata:
Langmuir
fascicolo: 13, volume: 13, anno: 1997,
pagine: 3392 - 3396
SICI:
0743-7463(1997)13:13<3392:AISSOC>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-OXIDE SURFACES; AL2O3-COATED OPTICS; LINEAR DICHROISM; COMPLEXATION; TEMPERATURE; CHEMISTRY; ZRO2; TIO2; H-2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
K.D. Dobson e A.J. Mcquillan, "AN INFRARED SPECTROSCOPIC STUDY OF CARBONATE ADSORPTION TO ZIRCONIUM DIOXIDE SOL-GEL FILMS FROM AQUEOUS-SOLUTIONS", Langmuir, 13(13), 1997, pp. 3392-3396

Abstract

Internal reflection infrared spectroscopy has been used to investigate the formation and nature of surface carbonates on ZrO2 sol-gel films. Films prepared in atmospheres of CO2 and air exhibited an enhancement of bands in the 1600-1300 cm(-1) spectral region compared to films prepared in an Ar atmosphere. This is due to formation of surface carbonates from the reaction of atmospheric CO2 with the metal oxide film. Both bidentate carbonate and bidentate bicarbonate surface species areformed. For in situ solution adsorption studies, ZrO2 sol-gel films were pretreated with an alkaline wash to remove surface contaminants. Adsorption from dilute aqueous (HCO3-)-C-12 solutions resulted in the appearance of strong infrared absorptions at 1551 and 1349 cm(-1) as well as other absorptions at 1091, 1052, 849, and 761 cm(-1). The strongabsorptions shifted to 1505 and 1304 cm(-1) with adsorption from dilute (HCO3-)-C-13 Solutions. The adsorbed species has been assigned to abidentate carbonate from existing infrared absorption data for both zirconium carbonato complexes and previously assigned surface carbonatespecies. Adsorption isotherms were determined from in situ infrared spectral measurements of adsorbate absorbances as a function of bicarbonate solution concentration. A Langmuir isotherm analysis was used to obtain an equilibrium constant for adsorption of 2 x 10(5) M-1, indicating a strongly bound surface complex.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 14:27:16