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Titolo:
ATR-FTIR study of the stability trends of carboxylate complexes formed on the surface of titanium dioxide particles immersed in water
Autore:
Weisz, AD; Regazzoni, AE; Blesa, MA;
Indirizzi:
Comis Nacl Energia Atom, Unidad Act Quim, RA-1429 Buenos Aires, DF, Argentina Comis Nacl Energia Atom Buenos Aires DF Argentina RA-1429 , DF, Argentina Univ Nacl Gen San Martin, Escuela Posgrado, Buenos Aires, DF, Argentina Univ Nacl Gen San Martin Buenos Aires DF Argentina Aires, DF, Argentina
Titolo Testata:
SOLID STATE IONICS
fascicolo: 1, volume: 143, anno: 2001,
pagine: 125 - 130
SICI:
0167-2738(200106)143:1<125:ASOTST>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERFACIAL ELECTRON-TRANSFER; CHARGE-TRANSFER SENSITIZERS; METAL-OXIDE SURFACES; AQUEOUS-SOLUTIONS; TIO2; DEGRADATION; ADSORPTION; ACID; CHEMISORPTION; CATECHOL;
Keywords:
ATR-FTIR; adsorption; TiO2; carboxylic acids; surface complexation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Weisz, AD Comis Nacl Energia Atom, Unidad Act Quim, Ave Libertador 8250, RA-1429 Buenos Aires, DF, Argentina Comis Nacl Energia Atom Ave Libertador 8250 Buenos Aires DF Argentina RA-1429
Citazione:
A.D. Weisz et al., "ATR-FTIR study of the stability trends of carboxylate complexes formed on the surface of titanium dioxide particles immersed in water", SOL ST ION, 143(1), 2001, pp. 125-130

Abstract

The use of titanium dioxide slurries or powders to enact the photocatalytic destruction of contaminants in water depends on its properties as a wide gap semiconductor. The charge transfer events at the water/semiconductor interface are strongly modified by the interaction of the titanium dioxide surface with solutes present in water, In this paper, we discuss the stability trend of the surface complexes formed by a series of organic anions (chemisorbed on TiO2). The surface interaction was studied by ATR-FTIR, and the spectra obtained at different complexant concentrations and pH values were used to derive Langmuir-type stability constants. It is shown that surface complexation can be described as the dissociative chemisorption of the neutral acid, with the creation of a zwitterionic surface species. There is a linear Gibbs energy relationship (LGER) between the stability of the surfacecomplexes and the first acidity constant of the ligand, with slope of 1.8. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 07:52:53