Oxidation of chlorobenzene with Fenton's reagent

Abstract

The degradation of chlorobenzene and its oxidation products by hydroxyl radicals generated with Fenton's reagent was studied. In the absence of oxygen, chlorophenols, dichlorobiphenyls (DCBs), and phenolic polymers were the predominant initial products. In the presence of oxygen, DCB yields decreased markedly and chlorobenzoquinone was also formed. Chlorophenol isomers were further oxidized by OH's to form chlorinated and nonchlorinated diols. DCBs and the phenolic polymers were also oxidized. The highest yield of product formed per mole of H202 consumed was observed in the pH range of 2-3. The pH dependence and product distributions suggest that complexes of aromatic intermediate compounds with iron and oxygen may play a role in regulating reaction pathways. At pH 3.0, approximately 5 mol of H202/mol of chlorobenzene were required to remove all of the aromatic intermediate compounds from solution.

Enhanced Fenton degradation of Rhodamine B over nanoscaled Cu-doped LaTiO3 perovskite

“…), while hydrogen peroxide is a more desirable oxidant agent. The classic Fenton process (dissolved Fe(II) and H 2 O 2 ) [1] is capable of degrading organic pollutants into harmless chemicals such as CO 2 and H 2 O, but its application is limited by the narrow working pH range (<4) [2,3], separation and recovery of the iron species specially in industrial wastewater treatment [4]. For these reasons, the development of heterogeneous Fenton systems has received considerable interest and many heterogeneous Fenton-like catalysts have been reported, such as iron oxides [5][6][7][8], iron-immobilized zeolites [9], clays [10,11], and carbon materials [12].…”

Decolorization of methylene blue in layered manganese oxide suspension with H2O2

“…One of them is the classic Fenton process (dissolved Fe(II) and H 2 O 2 ) [2], which is capable of degrading organic pollutants into harmless chemicals such as CO 2 and H 2 O. However, the application of traditional Fenton reaction is limited by the narrow working pH range (<4) [3,4], separation and recovery of the iron species specially in industrial wastewater treatment [5]. To overcome these drawbacks, some efforts have been made to develop heterogeneous Fenton systems [6,7] and many heterogeneous Fenton-like catalysts have been reported, such as iron oxides [8][9][10][11][12], iron-immobilized zeolites [13], clays [14,15], and carbon materials [16,17].…”

Triclosan breakdown by Fenton-like oxidation

“…Therefore, other potential solutions need to be investigated. In this context, Fenton oxidation has been studied for chlorobenzenes [22], chlorophenols [23], chlorinated pesticides [24] and PCBs [25]. Fenton's reagent can provide in principle a feasible solution for emerging pollutants which are in general at very low concentrations provided that the total organic load of the effluent to be treated is also within a low range so that the process can be performed at reasonably low H 2 O 2 dosages.…”