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Titolo:
Photooxidation mechanism of nitrogen-containing compounds at TiO2/H2O interfaces: an experimental and theoretical examination of hydrazine derivatives
Autore:
Waki, K; Zhao, JC; Horikoshi, S; Watanabe, N; Hidaka, H;
Indirizzi:
Iwaki Meisei Univ, Frontier Res Ctr Global Environm Protect, Hino, Tokyo 1918506, Japan Iwaki Meisei Univ Hino Tokyo Japan 1918506 ct, Hino, Tokyo 1918506, Japan Chinese Acad Sci, Inst Photog Chem, Beijing 100101, Peoples R China Chinese Acad Sci Beijing Peoples R China 100101 100101, Peoples R China Toyo Univ, Dept Appl Chem, Fac Engn, Kawagoe, Saitama 3500815, Japan Toyo Univ Kawagoe Saitama Japan 3500815 , Kawagoe, Saitama 3500815, Japan
Titolo Testata:
CHEMOSPHERE
fascicolo: 3, volume: 41, anno: 2000,
pagine: 337 - 343
SICI:
0045-6535(200008)41:3<337:PMONCA>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOCATALYTIC DEGRADATION; ORGANIC-COMPOUNDS; TITANIUM-DIOXIDE; WATER INTERFACE; NO3 IONS; OXIDATION; MINERALIZATION; AMMONIUM; NITRATE; NH4+;
Keywords:
photooxidation; photodegradation; hydrazine; photocatalysis; titanium dioxide; gas-generating agent;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Hidaka, H Iwaki Meisei Univ, Frontier Res Ctr Global Environm Protect, Hino, Tokyo 1918506, Japan Iwaki Meisei Univ Hino Tokyo Japan 1918506 Tokyo 1918506, Japan
Citazione:
K. Waki et al., "Photooxidation mechanism of nitrogen-containing compounds at TiO2/H2O interfaces: an experimental and theoretical examination of hydrazine derivatives", CHEMOSPHERE, 41(3), 2000, pp. 337-343

Abstract

The photocatalytic oxidation of oxalyldihydrazide, N, N'-bis(hydrazocarbonyl)hydrazide, N, N'-bis(ethoxycarbonyl)hydrazide, malonyldihydrazide, N-malonyl-bis[(N'-ethoxycarbonyl)hydrazide] was examined in aqueous TiO2 dispersions under UV illumination. The photomineralization of nitrogen and carbon atoms in the substrates into N-2 gas, NH4+ (and/or NO3-) ions, and CO2 gas was determined by HPLC and GC analysis. The formation of carboxylic acid intermediates also occurred in the photooxidation process. The photocatalyticmechanism is discussed on the basis of the experimental results, and with molecular orbital (MO) simulation of frontier electron density and point charge. Substrate carbonyl groups readily adsorb on the TiO2 surface, and thebonds between carbonyl group carbon atoms and adjacent hydrate group nitrogen atoms are cleaved predominantly in the initial photooxidation process. The hydrate groups were photoconverted mainly into N-2 gas (in mineralization yields above 70%) and partially to NH4+ ions (below 10%). The formation of NO3- ions was scarcely recognized. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 00:06:34