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Identification of the fixed nitrogen containing species during the photo‐oxidative fixation of molecular nitrogen on UV‐illuminated TiO 2 surfaces
Author(s) -
Navio J. A.,
Real C.,
Bickley R. I.
Publication year - 1994
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740220190
Subject(s) - x ray photoelectron spectroscopy , nitrogen , photoexcitation , chemistry , ultraviolet , adsorption , titanium oxide , nitrogen fixation , ion , photochemistry , crystallite , nitrogen oxides , analytical chemistry (journal) , inorganic chemistry , crystallography , materials science , organic chemistry , chemical engineering , excited state , optoelectronics , engineering , physics , nuclear physics , waste management
Ultraviolet photoexcitation of hydroxylated TiO 2 surfaces in the presence of a mixture on N 2 /O 2 gas (air) produces some adsorbed nitrogen oxide species which were previously assigned indirectly as probably N 2 O 2 2− . Direct assignment is now reported here. From comparisons of the thermodesorption profiles and the XPS results from polycrystalline Na 2 N 2 O 2 and from the corresponding data obtained from TiO 2 surface upon which Na 2 N 2 O 2 had been allowed to adsorb with the thermodesorption profile and XPS data obtained from the photo‐induced fixation of nitrogen on TiO 2 , it can be concluded that the principal species formed during the photo‐oxidative fixation of molecular nitrogen on TiO 2 is hyponitrite anion, N 2 O 2 2− .