Two-phase ozonation of chlorinated organics
Identifieur interne : 000897 ( Main/Exploration ); précédent : 000896; suivant : 000898Two-phase ozonation of chlorinated organics
Auteurs : D. Bhattacharyya [États-Unis] ; T. F. Van Dierdonck [États-Unis] ; S. D. West [États-Unis] ; A. R. Freshour [États-Unis]Source :
- Journal of Hazardous Materials [ 0304-3894 ] ; 1994.
Abstract
Although ozonation is an effective advanced oxidation process for the destruction of hazardous organic pollutants, a single-phase ozonation system is limited by low ozone solubility, low ozone stability, and a lack of selective oxidation potential. These problems may be overcome by mixing a non-polar fluorinated hydrocarbon solvent (FC40) with the aqueous solution. The primary advantages of the FC40 solvent are that it is non-toxic, reusable, has an ozone solubility 10 times that of water, and that 85% of the ozone remains in the solvent even after 2 h. This novel two-phase process has been utilized to study the rapid destruction of trichlorophenol (TCP), pentachlorophenol (PCP), 1,3-dichlorobenzene (DCB), and trichloroethylene (TCE). Our results show that 98% of a 50 mg/l solution of TCP can be degraded 30 s if a molar ratio of 12 moles ozone/mole TCP is utilized. Further studies have reported that the two-phase system is capable of degrading nearly 92% of a 10 mg/l solution of pentachlorophenol (PCP) within 1 min when a ratio of 4.3 moles ozone/mole PCP is used. Also, 80% of a 78 mg/l solution of 1,3 dichlorobenzene (1,3-DCB) is degraded within 5 min for a 21.2 molar ratio of ozone/1,3-DCB. Furthermore, these reaction rates are not altered significantly even if high concentrations of sodium bicarbonate, a free radical scavenger, are present in the aqueous phase.
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DOI: 10.1016/0304-3894(94)00095-X
Affiliations:
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These problems may be overcome by mixing a non-polar fluorinated hydrocarbon solvent (FC40) with the aqueous solution. The primary advantages of the FC40 solvent are that it is non-toxic, reusable, has an ozone solubility 10 times that of water, and that 85% of the ozone remains in the solvent even after 2 h. This novel two-phase process has been utilized to study the rapid destruction of trichlorophenol (TCP), pentachlorophenol (PCP), 1,3-dichlorobenzene (DCB), and trichloroethylene (TCE). Our results show that 98% of a 50 mg/l solution of TCP can be degraded 30 s if a molar ratio of 12 moles ozone/mole TCP is utilized. Further studies have reported that the two-phase system is capable of degrading nearly 92% of a 10 mg/l solution of pentachlorophenol (PCP) within 1 min when a ratio of 4.3 moles ozone/mole PCP is used. Also, 80% of a 78 mg/l solution of 1,3 dichlorobenzene (1,3-DCB) is degraded within 5 min for a 21.2 molar ratio of ozone/1,3-DCB. Furthermore, these reaction rates are not altered significantly even if high concentrations of sodium bicarbonate, a free radical scavenger, are present in the aqueous phase.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Kentucky</li></region></list><tree><country name="États-Unis"><region name="Kentucky"><name sortKey="Bhattacharyya, D" sort="Bhattacharyya, D" uniqKey="Bhattacharyya D" first="D." last="Bhattacharyya">D. Bhattacharyya</name></region><name sortKey="Freshour, A R" sort="Freshour, A R" uniqKey="Freshour A" first="A. R." last="Freshour">A. R. Freshour</name><name sortKey="Van Dierdonck, T F" sort="Van Dierdonck, T F" uniqKey="Van Dierdonck T" first="T. F." last="Van Dierdonck">T. F. Van Dierdonck</name><name sortKey="West, S D" sort="West, S D" uniqKey="West S" first="S. D." last="West">S. D. West</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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