Fluorescence spectroscopic study of kinetics of gas-surface reactions between nitrogen dioxide and adsorbed pyrene

Autor:	H. Niki, Ching Hsong. Wu
Rok vydání:	1985
Předmět:	Chemistry Kinetics Fluorescence spectrometry Analytical chemistry General Chemistry Photochemistry Fluorescence Fluorescence spectroscopy Chemical kinetics Light intensity chemistry.chemical_compound Reaction rate constant Environmental Chemistry Pyrene
Zdroj:	Environmental Science & Technology. 19:1089-1094
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es00141a012
Popis:	The kinetics of reactions between gaseous NO/sub 2/ and pyrene adsorbed on silica plates was studied at 25/sup 0/C in N/sub 2/ or O/sub 2//N/sub 2/ diluent by using a fluorescence spectroscopic method. The temporal behavior of the fluorescence signal of pyrene, excited at 325 nm with a He/Cd cw laser, was monitored as a function of wavelength, excitation light intensity, and the concentrations of gaseous NO/sub 2/, O/sub 2/, and adsorbed pyrene. For monodispersed samples, the fluorescence signals followed first-order kinetics with respect to NO/sub 2/ concentrations from 0 to 180 ppm. Apparent bimolecular rate constants were determined to be (8.2 +/- 1.0) x 10/sup -3/ and (1.1 +/- 0.23) x 10/sup -3/ ppm/sup -1/ min/sup -1/ in N/sub 2/ and in air, respectively. Possible explanations for an O/sub 2/ inhibition effect were discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70779fab72e71c35c6aae6c709c49da5 https://doi.org/10.1021/es00141a012 Zobrazit plný text záznamu