Degradation of chlorophenols in aqueous media using UV XeBr excilamp in a flow-through reactor.
2-Chlorophenol (2-CP), 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) at initial concentrations of 10, 20, 50 and 100mg l(-1) were degraded in aqueous media by direct UV photolysis using dielectric barrier discharge XeBr( *) excilamp (283nm) in a flow-through photoreactor. The pseudo-first order rate constants were highest and half-life times were lowest for 4-CP. The rates of photolysis under the experimental conditions increased in the order: 2-CP<2,4-DCP<4-CP. The intermediates of photolysis were identified by GC-MS and HPLC. The evolution of hydroquinone and p-benzoquinone as major intermediates of 4-CP photolysis was monitored.
Matafonova
Galina
G
Baikal Institute of Nature Management, Siberian Branch of Russian Academy of Sciences, Sakhyanova 6, Ulan-Ude 670047, Russia. ngal@binm.bscnet.ru
Christofi
Nick
N
Batoev
Valeriy
V
Sosnin
Edward
E
D016227:Benzoquinones / Q000737:chemistry; D002733:Chlorophenols / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D008401:Gas Chromatography-Mass Spectrometry; D006873:Hydroquinones / Q000737:chemistry; D010782:Photolysis / Q000528:radiation effects*; D014466:Ultraviolet Rays
D016227:Benzoquinones; D002733:Chlorophenols; D006873:Hydroquinones; C004532:quinone; C031927:hydroquinone