Formation of brominated phenolic contaminants from natural manganese oxides-catalyzed oxidation of phenol in the presence of Br−

Add time:07/19/2019    Source:sciencedirect.com

Brominated phenolic compounds (BPCs) are a class of persistent and potentially toxic compounds ubiquitously present in the aquatic environment. However, the origin of BPCs is not clearly understood. In this study, we investigated the formation of BPCs from natural manganese oxides (MnOx)-catalyzed oxidation of phenol in the presence of Br−. Experiments at ambient temperature clearly demonstrated that BPCs were readily produced via the oxidation of phenol by MnOx in the presence of Br−. In the reaction of MnOx sand with 0.213 μmol/L phenol and 0.34 mmol/L Br− for 10 min, more than 60% of phenol and 56% of Br− were consumed to form BPCs. The yield of BPCs increased with increasing concentrations of phenol and Br−. Overall, a total of 14 BPCs including simple bromophenols (4-bromophenol, 2,4-dibromophenol, and 2,4,6-tribromophenol), hydroxylated polybrominated diphenyl ethers (OH-PBDEs), and hydroxylated polybrominated biphenyls (OH-PBBs) were identified. The production of BPCs increased with increasing concentrations of Br− or phenol. It was deduced that Br− was first oxidized to form active bromine, leading to the subsequent bromination of phenol to form bromophenols. The further oxidation of bromophenols by MnOx resulted in the formation of OH-PBDEs and OH-PBBs. In view of the ubiquity of phenol, Br−, and MnOx in the environment, MnOx-mediated oxidation may play a role on the natural production of BPCs.

We also recommend Trading Suppliers and Manufacturers of 4-(4-BROMOPHENOXY)PHENOL (cas 13320-48-4). Pls Click Website Link as below: cas 13320-48-4 suppliers

Prev:Application and limitations of the methyl imidate protection strategy of N-acetylglucosamine for glycosylations at O-4: synthesis of Lewis A and Lewis X trisaccharide analogues
Next:Multiple catalytic roles of chloroperoxidase in the transformation of phenol: Products and pathways)