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Photolytic degradation of polybromodiphenyl ethers under UV-lamp and solar irradiations.
J Hazard Mater. 2009 Jun 15; 165(1-3):34-8.JH

Abstract

Polybromodiphenyl ethers (PBDEs) are widely used flame retardant additives and have been mainly used in polymers for many plastic and electronic products. PBDEs have been found to bioaccumulate in both aquatic and terrestrial ecosystems and even human bodies. The technical product with the highest use is decabrominated diphenyl ether (BDE-209). Therefore, we chose to examine the solar and UV-lamp degradation of BDE-209. A linear increase of the photodegradation rate constant for BDE-209 was observed with the solar light intensity. The degradation reactions follow the pseudo-first-order kinetics. The photodegradation of BDE-209 produced other less brominated diphenyl ethers under ultraviolet light exposure, suggesting that the photodegradation of BDE-209 is a sequential dehalogenation mechanism. BDE-209 underwent rapid reductive debromination in these photodecomposition experiments. The formation rate constants of three nonabromodiphenyl ethers increase with the order of BDE-206, BDE-207 and BDE-208, indicating debromination mainly occurred at para>meta>ortho positions. These findings of the process properties and reductive debromination mechanism of the photolytic degradation of PBDEs can facilitate the design of remediation processes and also aid in predicting their fate in the environment.

Authors+Show Affiliations

Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung, Taiwan, ROC. yhs@nchu.edu.twNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18996643

Citation

Shih, Yang-hsin, and Chun-Kang Wang. "Photolytic Degradation of Polybromodiphenyl Ethers Under UV-lamp and Solar Irradiations." Journal of Hazardous Materials, vol. 165, no. 1-3, 2009, pp. 34-8.
Shih YH, Wang CK. Photolytic degradation of polybromodiphenyl ethers under UV-lamp and solar irradiations. J Hazard Mater. 2009;165(1-3):34-8.
Shih, Y. H., & Wang, C. K. (2009). Photolytic degradation of polybromodiphenyl ethers under UV-lamp and solar irradiations. Journal of Hazardous Materials, 165(1-3), 34-8. https://doi.org/10.1016/j.jhazmat.2008.09.103
Shih YH, Wang CK. Photolytic Degradation of Polybromodiphenyl Ethers Under UV-lamp and Solar Irradiations. J Hazard Mater. 2009 Jun 15;165(1-3):34-8. PubMed PMID: 18996643.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photolytic degradation of polybromodiphenyl ethers under UV-lamp and solar irradiations. AU - Shih,Yang-hsin, AU - Wang,Chun-Kang, Y1 - 2008/10/04/ PY - 2008/04/08/received PY - 2008/07/29/revised PY - 2008/09/19/accepted PY - 2008/11/11/pubmed PY - 2009/7/8/medline PY - 2008/11/11/entrez SP - 34 EP - 8 JF - Journal of hazardous materials JO - J Hazard Mater VL - 165 IS - 1-3 N2 - Polybromodiphenyl ethers (PBDEs) are widely used flame retardant additives and have been mainly used in polymers for many plastic and electronic products. PBDEs have been found to bioaccumulate in both aquatic and terrestrial ecosystems and even human bodies. The technical product with the highest use is decabrominated diphenyl ether (BDE-209). Therefore, we chose to examine the solar and UV-lamp degradation of BDE-209. A linear increase of the photodegradation rate constant for BDE-209 was observed with the solar light intensity. The degradation reactions follow the pseudo-first-order kinetics. The photodegradation of BDE-209 produced other less brominated diphenyl ethers under ultraviolet light exposure, suggesting that the photodegradation of BDE-209 is a sequential dehalogenation mechanism. BDE-209 underwent rapid reductive debromination in these photodecomposition experiments. The formation rate constants of three nonabromodiphenyl ethers increase with the order of BDE-206, BDE-207 and BDE-208, indicating debromination mainly occurred at para>meta>ortho positions. These findings of the process properties and reductive debromination mechanism of the photolytic degradation of PBDEs can facilitate the design of remediation processes and also aid in predicting their fate in the environment. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/18996643/Photolytic_degradation_of_polybromodiphenyl_ethers_under_UV_lamp_and_solar_irradiations_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(08)01416-7 DB - PRIME DP - Unbound Medicine ER -