کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4407496 1618816 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Formation of brominated phenolic contaminants from natural manganese oxides-catalyzed oxidation of phenol in the presence of Br−
ترجمه فارسی عنوان
تشکیل فرآورده های فنولیک برومند از اکسید منگنز طبیعی - اکسیداسیون فنل در فرآورده های لبنی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


• BPCs are produced from MnOx-catalyzed oxidation of phenol in the presence of bromide.
• The formation pathways were proposed.
• BPCs production increased with increasing concentrations of Br− or phenol.
• MnOx-mediated oxidation may play a role on the natural production of BPCs.

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 155, July 2016, Pages 266–273
نویسندگان
, , , , ,