Aqueous phase ozonation of chlorophenols

Antibiotic removal from wastewaters: The ozonation of amoxicillin

“…Kinetic information available in the literature is dealing only with on the ozone attack to the phenolic rings [29][30][31][32] with no indication concerning the sulfur atom. The selectivity for the two pathways (a and b) cannot be thus predicted.…”

Photocatalytic oxidation of treated municipal wastewaters for the removal of phenolic compounds: optimization and modeling using response surface methodology (RSM) and artificial neural networks (ANNs)

“…9(A)), increased during the first minutes of reaction, suggesting the formation of intermediates from incomplete oxidation during the initial steps of the photocatalytic degradation which exhibited a stronger UV absorbance than the parent wastewater composition. This behavior was also observed in the photolytic degradation of phenol at λ = 268 nm, 33 photocatalytic degradation of other organic compounds 34 and other type of wastewaters such as cottonseed 35 and the ozonation of chlorophenols 36 and pharmaceutical wastewaters. 37 The oscillation of absorbance could be related with polymerization and other reactions of phenolic monomers as observed also in olive mill wastewater treatment with photo-Fenton process.…”

Toxicity measurements in aqueous solution during ozonation of mono-chlorophenols

“…2-chloro-2, 4-hexadienedioic acid was the next-step oxidant of 3-chloro-catechol through cleavage of the aromatic ring. Another study also indicated similar mechanisms in ozonation of 2-CP (Kuo and Huang, 1995). In addition, 3-chloro-catechol might be the precursor compound of the dimmer structure formed through the mechanism of oxidative coupling.…”

“…7) (Kuo and Huang, 1995). The intermediates of 4-chloro-catechol and 3-chloro-2, 4-hexadienedioic acid were the major byproducts during the ozonation of 4-CP.…”