LAPSE:2023.2596
Published Article
LAPSE:2023.2596
Photodegradation of Decabrominated Diphenyl Ether in Soil Suspensions: Kinetics, Mechanisms and Intermediates
February 21, 2023
Abstract
Pollution by polybrominated diphenyl ethers (PBDEs) is a major concern due to their bioaccumulation, persistence, and carcinogenicity. This study aimed to investigate the decabrominated diphenyl ether (BDE-209) photodegradation in soil suspensions. The results indicate BDE-209 can degrade in soil suspensions and its degradation follows pseudo-first-order kinetics. The light sources and intensity effects were studied and the photodegradation rates were 500 W Mercury Lamp > 300 W Mercury Lamp > 500 W Xenon Lamp > 300 W Xenon Lamp, which indicates UV light is the main reason for BDE-209 degradation. Soil particle inhibits BDE-209 photodegradation due to the light-shielding effect. BDE-209 photodegradation rates increased from 0.055 to 0.071 h−1 with pH value increasing from 3.5 to 9.5. This may be because the products are more easily produced in higher pH soil suspensions. The presence of humic acid (HA) may inhibit BDE-209 photodegradation by photo-shielding. Fe3+ and Cu2+ have an adverse effect on BDE-209 photodegradation due to the photo competition. The •OH and 1O2 were detected in soil solutions. Analysis of the photoproducts of BDE-209 by gas chromatography mass spectrometry (GC-MS) and liquid chromatography time of flight mass spectrometry (LC-TOF-MS) showed that BDE-209 was mainly debrominated to the lower-brominated BDEs and the reactive oxygen radicals may not lead to BDE-209 degradation.
Pollution by polybrominated diphenyl ethers (PBDEs) is a major concern due to their bioaccumulation, persistence, and carcinogenicity. This study aimed to investigate the decabrominated diphenyl ether (BDE-209) photodegradation in soil suspensions. The results indicate BDE-209 can degrade in soil suspensions and its degradation follows pseudo-first-order kinetics. The light sources and intensity effects were studied and the photodegradation rates were 500 W Mercury Lamp > 300 W Mercury Lamp > 500 W Xenon Lamp > 300 W Xenon Lamp, which indicates UV light is the main reason for BDE-209 degradation. Soil particle inhibits BDE-209 photodegradation due to the light-shielding effect. BDE-209 photodegradation rates increased from 0.055 to 0.071 h−1 with pH value increasing from 3.5 to 9.5. This may be because the products are more easily produced in higher pH soil suspensions. The presence of humic acid (HA) may inhibit BDE-209 photodegradation by photo-shielding. Fe3+ and Cu2+ have an adverse effect on BDE-209 photodegradation due to the photo competition. The •OH and 1O2 were detected in soil solutions. Analysis of the photoproducts of BDE-209 by gas chromatography mass spectrometry (GC-MS) and liquid chromatography time of flight mass spectrometry (LC-TOF-MS) showed that BDE-209 was mainly debrominated to the lower-brominated BDEs and the reactive oxygen radicals may not lead to BDE-209 degradation.
Record ID
Keywords
BDE-209, mechanism, photodegradation, products, soil suspension
Subject
Suggested Citation
Huang K, Lin H, Tao X, Zou M, Lu G. Photodegradation of Decabrominated Diphenyl Ether in Soil Suspensions: Kinetics, Mechanisms and Intermediates. (2023). LAPSE:2023.2596
Author Affiliations
Huang K: School of Ecology and Environment, Hainan University, Haikou 570228, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, China [ORCID]
Lin H: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Tao X: College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
Zou M: College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
Lu G: The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, China; School of Environment and Energy, South China University of Technology, Guangzhou 510006 [ORCID]
Lin H: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Tao X: College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
Zou M: College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
Lu G: The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, China; School of Environment and Energy, South China University of Technology, Guangzhou 510006 [ORCID]
Journal Name
Processes
Volume
10
Issue
4
First Page
718
Year
2022
Publication Date
2022-04-08
ISSN
2227-9717
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Original Submission
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PII: pr10040718, Publication Type: Journal Article
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LAPSE:2023.2596
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https://doi.org/10.3390/pr10040718
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Feb 21, 2023
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