The formation and influence of hydrogen peroxide during ozonation of para-chlorophenol.
Hydrogen peroxide was detected during the ozonation of para-chlorophenol (4-CP) in aqueous solutions. Its formation and influence on the reaction mechanism were examined. Semi-batch experiments showed that hydrogen peroxide was formed during the direct reaction between molecular ozone and 4-CP. The detected hydrogen peroxide could reach 12.3% of the initial mole concentration of 4-CP. Hydrogen peroxide reacts with ozone in neutral pH and leads to the appearance of the powerful oxidant, OH* radicals. An O(3)/OH* probe compound, succinate was then developed, and also included in the 4-CP solution matrix. The disappearance of succinate with time shows the amount of OH radicals. With enough tert-butanol inhibiting the OH* radical oxidation, results showed that 4-CP was transformed to para-quinone by ozone, and subsequently destroyed to formic acid and oxalic acid. Without scavengers of inactivation the OH* radicals, 4-CP was destroyed to low molecular weight acid.
Pi
Yunzheng
Y
Laboratory of Environmental Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China.
Zhang
Lisheng
L
Wang
Jianlong
J
D002733:Chlorophenols / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D019802:Succinic Acid / Q000737:chemistry; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
D002733:Chlorophenols; D010083:Oxidants, Photochemical; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; C029107:4-chlorophenol; D010126:Ozone; D019802:Succinic Acid; D006861:Hydrogen Peroxide