Ozonation, Ozone/UV and UV/H₂O₂Degradation of Chlorophenols

A comparative study of the advanced oxidation of 2,4-dichlorophenol

“…The superiority of photo-Fenton in dechlorination may be attributed to the high attackable capacity of photo-Fenton by direct nucleophilic displacement of chloride by OH • . Trapido et al [24] reported 62% dechlorination for 97% DCP elimination, which is in agreement with the value obtained in this study. Although intermediates were not identified, the degradation of DCP into other by-products was monitored by the change in the degree of oxidation.…”

“…The data also show that adding Fe(II) to the UV/H 2 O 2 has a significant influence on the DCP oxidation rate. Trapido et al, [24] studied the degradation of chlorophenols by UV and UV/H 2 O 2 and they reported apparent rate constants for DCP degradation of the same order of magnitude as those found in the present study. Fig.…”

Phenol and substituted phenols AOPs remediation

“…Although a lot of work has been carried out focused on the oxidation of phenol-type compounds by means of AOPs [2][3][4][5][6][7][8], some drawbacks/lacks can be found in the literature. For instance, most of the related literature reports on the efficiency of the technology to remove the parent/target compound.…”

Oxidation of several chlorophenolic derivatives by UV irradiation and hydroxyl radicals

“…8 In addition, it is expected that the oxidation of organic compounds by Fenton's reagent could be enhanced by the presence of UV irradiation in the photo-Fenton system, which could produce an increased concentration of OH radicals in the solution, and thus the process would be more ef®cient in destroying refractory organics to benign products such as CO 2 9,10 and have been shown to be effective technologies to remove especially toxic and hazardous pollutants from water, such as pesticides and herbicides, organochloride derivatives, phenols and polyphenols and so forth. 11,12 Their integration with other wastewater treatment operations may serve either as tertiary polishing operations, or as initiation steps, wherein recalcitrant pollutants are partially degraded, and the decomposition of partially degraded by-products is left to a less expensive technology such as biological treatment.…”