Cargando…

Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment

Tetrabromobisphenol A (TBBPA) is one of the most widely used brominated flame retardants and has attracted more and more attention. In this work, the parent TBBPA with an initial concentration of 100 mg/L was completely removed after 6 min of ozonation at pH 8.0, and alkaline conditions favored a mo...

Descripción completa

Detalles Bibliográficos
Autores principales: Qu, Ruijuan, Feng, Mingbao, Wang, Xinghao, Huang, Qingguo, Lu, Junhe, Wang, Liansheng, Wang, Zunyao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4592209/
https://www.ncbi.nlm.nih.gov/pubmed/26430733
http://dx.doi.org/10.1371/journal.pone.0139580
_version_ 1782393177830850560
author Qu, Ruijuan
Feng, Mingbao
Wang, Xinghao
Huang, Qingguo
Lu, Junhe
Wang, Liansheng
Wang, Zunyao
author_facet Qu, Ruijuan
Feng, Mingbao
Wang, Xinghao
Huang, Qingguo
Lu, Junhe
Wang, Liansheng
Wang, Zunyao
author_sort Qu, Ruijuan
collection PubMed
description Tetrabromobisphenol A (TBBPA) is one of the most widely used brominated flame retardants and has attracted more and more attention. In this work, the parent TBBPA with an initial concentration of 100 mg/L was completely removed after 6 min of ozonation at pH 8.0, and alkaline conditions favored a more rapid removal than acidic and neutral conditions. The presence of typical anions and humic acid did not significantly affect the degradation of TBBPA. The quenching test using isopropanol indicated that direct ozone oxidation played a dominant role during this process. Seventeen reaction intermediates and products were identified using an electrospray time-of-flight mass spectrometer. Notably, the generation of 2,4,6-tribromophenol was first observed in the degradation process of TBBPA. The evolution of reaction products showed that ozonation is an efficient treatment for removal of both TBBPA and intermediates. Sequential transformation of organic bromine to bromide and bromate was confirmed by ion chromatography analysis. Two primary reaction pathways that involve cleavage of central carbon atom and benzene ring cleavage concomitant with debromination were thus proposed and further justified by calculations of frontier electron densities. Furthermore, the total organic carbon data suggested a low mineralization rate, even after the complete removal of TBBPA. Meanwhile, the acute aqueous toxicity of reaction solutions to Photobacterium Phosphoreum and Daphnia magna was rapidly decreased during ozonation. In addition, no obvious difference in the attenuation of TBBPA was found by ozone oxidation using different water matrices, and the effectiveness in natural waters further demonstrates that ozonation can be adopted as a promising technique to treat TBBPA-contaminated waters.
format Online
Article
Text
id pubmed-4592209
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-45922092015-10-09 Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment Qu, Ruijuan Feng, Mingbao Wang, Xinghao Huang, Qingguo Lu, Junhe Wang, Liansheng Wang, Zunyao PLoS One Research Article Tetrabromobisphenol A (TBBPA) is one of the most widely used brominated flame retardants and has attracted more and more attention. In this work, the parent TBBPA with an initial concentration of 100 mg/L was completely removed after 6 min of ozonation at pH 8.0, and alkaline conditions favored a more rapid removal than acidic and neutral conditions. The presence of typical anions and humic acid did not significantly affect the degradation of TBBPA. The quenching test using isopropanol indicated that direct ozone oxidation played a dominant role during this process. Seventeen reaction intermediates and products were identified using an electrospray time-of-flight mass spectrometer. Notably, the generation of 2,4,6-tribromophenol was first observed in the degradation process of TBBPA. The evolution of reaction products showed that ozonation is an efficient treatment for removal of both TBBPA and intermediates. Sequential transformation of organic bromine to bromide and bromate was confirmed by ion chromatography analysis. Two primary reaction pathways that involve cleavage of central carbon atom and benzene ring cleavage concomitant with debromination were thus proposed and further justified by calculations of frontier electron densities. Furthermore, the total organic carbon data suggested a low mineralization rate, even after the complete removal of TBBPA. Meanwhile, the acute aqueous toxicity of reaction solutions to Photobacterium Phosphoreum and Daphnia magna was rapidly decreased during ozonation. In addition, no obvious difference in the attenuation of TBBPA was found by ozone oxidation using different water matrices, and the effectiveness in natural waters further demonstrates that ozonation can be adopted as a promising technique to treat TBBPA-contaminated waters. Public Library of Science 2015-10-02 /pmc/articles/PMC4592209/ /pubmed/26430733 http://dx.doi.org/10.1371/journal.pone.0139580 Text en © 2015 Qu et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Qu, Ruijuan
Feng, Mingbao
Wang, Xinghao
Huang, Qingguo
Lu, Junhe
Wang, Liansheng
Wang, Zunyao
Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment
title Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment
title_full Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment
title_fullStr Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment
title_full_unstemmed Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment
title_short Rapid Removal of Tetrabromobisphenol A by Ozonation in Water: Oxidation Products, Reaction Pathways and Toxicity Assessment
title_sort rapid removal of tetrabromobisphenol a by ozonation in water: oxidation products, reaction pathways and toxicity assessment
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4592209/
https://www.ncbi.nlm.nih.gov/pubmed/26430733
http://dx.doi.org/10.1371/journal.pone.0139580
work_keys_str_mv AT quruijuan rapidremovaloftetrabromobisphenolabyozonationinwateroxidationproductsreactionpathwaysandtoxicityassessment
AT fengmingbao rapidremovaloftetrabromobisphenolabyozonationinwateroxidationproductsreactionpathwaysandtoxicityassessment
AT wangxinghao rapidremovaloftetrabromobisphenolabyozonationinwateroxidationproductsreactionpathwaysandtoxicityassessment
AT huangqingguo rapidremovaloftetrabromobisphenolabyozonationinwateroxidationproductsreactionpathwaysandtoxicityassessment
AT lujunhe rapidremovaloftetrabromobisphenolabyozonationinwateroxidationproductsreactionpathwaysandtoxicityassessment
AT wangliansheng rapidremovaloftetrabromobisphenolabyozonationinwateroxidationproductsreactionpathwaysandtoxicityassessment
AT wangzunyao rapidremovaloftetrabromobisphenolabyozonationinwateroxidationproductsreactionpathwaysandtoxicityassessment