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001-es BibID:	BIBFORM089056
Első szerző:	Nemes Attila
Cím:	Kinetics and mechanism of the carbonate ion inhibited aqueous ozone decomposition / Attila Nemes, István Fábián, Rudi van Eldik
Dátum:	2000
ISSN:	1089-5639
Megjegyzések:	The carbonate ion inhibited aqueous decomposition of ozone was studied by the stopped-flow method at 25.0 +/- 0.1 degrees C in 0.5 M NaClO4. It was shown that the rate of decomposition sharply decreases and reaches a limiting value by increasing the carbonate ion concentration. A detailed kinetic model was developed for the interpretation of the results. The corresponding set of rate constants was calculated by simultaneously fitting kinetic traces obtained at the absorption maxima of O-3 (260 nm), O-3(-) (430 nm), and CO3- (600 nm). It was confirmed that the inhibition is mainly due to the removal of two dominant chain carrier radicals, OH and O-3(-), via the following reaction steps: CO32- + OH --> CO3- + OH-, k = (1.0 +/- 0.1) x 10(8) M-1 s(-1) and CO3- + O-3(-) --> CO32- + O-3, k = (5.5 +/- 0.5) x 10(7) M-1 s(-1). The kinetically less significant reactions of other transient species are also discussed in detail. The mechanism gives proper description of ozone decay, the formation and subsequent disappearance of ozonide ion and carbonate ion radicals, as well as the concentration change of other intermediates over the pH range 10.7-12.8. The model predicts that ozone decomposition occurs in a simple first-order process at high CO32- concentration, in agreement with the experimental data.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Journal of Physical Chemistry A. - 104 : 34 (2000), p. 7995-8000. -
További szerzők:	Fábián István (1956-) (vegyész) Eldik, Rudi, Van
Pályázati támogatás:	OTKA M 028244 OTKA OTKA T 029568 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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