Keiichi Tanaka, Wandee Luesaiwong, T. Hisanaga
Jul 18, 1997
Citations
2
Influential Citations
83
Citations
Quality indicators
Journal
Journal of Molecular Catalysis A-chemical
Abstract
Abstract Three mononitrophenol compounds (2-, 3- and 4-) 2,4-dinitrophenol and picric acid (2,4,6-trinitrophenol) were photocatalytically degraded in aqueous TiO 2 suspension. Among three mononitrophenol compounds the degradation rate of 4- and 2-nitrophenol were larger than that of 3-nitrophenol. The degradation rate decreased with the number of nitro group substituents. This reactivity follows Hammett law with regard to the effect of nitro group on phenolic functionality. Several polyhydroxylated aromatic intermediates were identified for mono- and dinitrophenol which indicated that the degradation started by the substitution of hydrogen and nitro groups by hydroxyl radical. Organic acid intermediates were identified besides aromatic compounds, among which formic and acetic acids were formed in the largest quantity. It was suggested for the transformation of nitro group that the formation ratio of NO − 3 and NH + 4 reflected the degradation mechanism of starting nitrophenolic compound.