Singlet oxygen-dominated non-radical oxidation process for efficient degradation of bisphenol A under high salinity condition

The degradation of organic contaminants under high salinity condition is still a challenge for environmental remediation due to the inhibiting effect resulted from the side reactions between radicals and anions. Here, we demonstrate the non-radical oxidation process via peroxymonosulfate (PMS) activ...

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Veröffentlicht in:Water research (Oxford) Jg. 148; S. 416 - 424
Hauptverfasser: Luo, Rui, Li, Miaoqing, Wang, Chaohai, Zhang, Ming, Nasir Khan, Muhammad Abdul, Sun, Xiuyun, Shen, Jinyou, Han, Weiqing, Wang, Lianjun, Li, Jiansheng
Format: Journal Article
Sprache:Englisch
Veröffentlicht: England Elsevier Ltd 01.01.2019
Schlagworte:
Anions
bisphenol A
catalysts
catalytic activity
chlorides
electron paramagnetic resonance spectroscopy
free radicals
graphene
High salinity condition
Inhibiting effect
Non-radical
oxidation
predation
remediation
saline water
salinity
Singlet oxygen
Anions
Singlet oxygen
Non-radical
Inhibiting effect
High salinity condition
ISSN:0043-1354, 1879-2448, 1879-2448
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Zusammenfassung:The degradation of organic contaminants under high salinity condition is still a challenge for environmental remediation due to the inhibiting effect resulted from the side reactions between radicals and anions. Here, we demonstrate the non-radical oxidation process via peroxymonosulfate (PMS) activation by metal-free carbon catalyst for efficiently decomposing bisphenol A (BPA) in saline water. The nitrogen-doped graphitic carbon (NGC700) exhibits excellent catalytic activity for depredating BPA at acid and neutral pH. Based on the scavenger experiments and electron paramagnetic resonance (EPR) analyses, the mechanism of catalytic oxidation was elucidated as the non-radical pathway, and singlet oxygen was identified as the primary reactive species. Experiments on the influence of anions (5–500 mM) further show that the inhibiting effect was overcame due to the non-radical process. Interestingly, Cl− markedly facilitated the catalytic performance by generating HOCl in the catalytic process. The results highlight leveraging the non-radical pathway dominated by singlet oxygen to conquer the inhibitory effect of anions in NGC700/PMS system, which represents a crucial step towards environmental remediation under high salinity condition. [Display omitted] •The non-radical oxidation process under high salinity condition was investigated.•Excellent performance on bisphenol A degradation was achieved in saline water.•Singlet oxygen was identified as the dominated reactive species.•The inhibiting effect of anions can be suppressed by the non-radical process.
Bibliographie:ObjectType-Article-1
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ISSN:0043-1354
1879-2448
1879-2448
DOI:10.1016/j.watres.2018.10.087