Purification of seawater contaminated with undegradable aromatic ring compounds using ozonolysis followed by titanium dioxide treatment.
Treatment of aromatic ring compounds, 2,4-dichlorophenoxy acetic acid (2,4-D), 2,4,5-trichloro-phenoxy acetic acid (2,4,5-T), and bisphenol A, in the artificial seawater, i.e. Allen seawater, was carried out by ozonation and titanium dioxide (TiO2) photocatalyst treatment. Each compound was degraded and varnished within 30 min by only ozonolysis at pH 9.0 and at 20 degrees C, while the TOC value of each compound decreased gradually but reached almost constant value, i.e. about 70-80% of the initial value, at even 30 min of ozonation time. Ozonolysis (30 min of ozonation time) followed by TiO2 photocatalyst treatment (50h of reaction time) was a very effective method for decreasing the TOC values of aromatic ring compounds in the artificial seawater. In consequence, TOC values of 2,4-D, 2,4,5-T, and bisphenol A could be reduced to about 28, 21, and 34% of their initial values, respectively.
Nakamura
Yoshitoshi
Y
Department of Life System, Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima, Japan. ynakamu@bio.tokushima-u.ac.jp
Kobayashi
Fumihisa
F
Daidai
Masakazu
M
Kurosumi
Akihiro
A
D015085:2,4,5-Trichlorophenoxyacetic Acid / Q000737:chemistry; D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry; D001559:Benzhydryl Compounds; D002851:Chromatography, High Pressure Liquid; D006863:Hydrogen-Ion Concentration; D009930:Organic Chemicals / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry; D012623:Seawater / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D000098826:Bisphenol A Compounds
D015085:2,4,5-Trichlorophenoxyacetic Acid; D015084:2,4-Dichlorophenoxyacetic Acid; D001559:Benzhydryl Compounds; D009930:Organic Chemicals; D010126:Ozone; D010636:Phenols; D014025:Titanium; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C006780:bisphenol A; D000098826:Bisphenol A Compounds