Journal
CHEMOSPHERE
Volume 219, Issue -, Pages 100-108Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.11.194
Keywords
Ozone; Sodium percarbonate; Coumarin; Radical identification; Kinetic model
Categories
Funding
- National Natural Science Foundation of China [51608109]
- Natural Science Foundation of Jiangsu Province [BK20160675]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Fundamental Research Funds for the Central Universities
- Jiangsu Overseas Visiting Scholar Program for University Prominent Yong & Middle-aged Teachers and Presidents, Perfection Scholars Programs of Southeast University, State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF16015]
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A high-efficient, eco-friendly and applicable oxidant of percarbonate (SPC, Na2CO3 center dot 1.5H(2)O(2)) is applied as oxidant in ozonation (O-3) process. In this work, coumarin (COU) decomposition by O-3 and O-3/SPC was proposed in terms of diverse parameters, including ozone concentration, SPC dosage and pH, with regard to the pseudo-first-order kinetic model. About 96.5% of 25 mg L-1 COU was removed by 2093 mg L-1 SPC and 2.08 mg L-1 O-3 within 30 min, whereas 49.8% of COU was exhausted in O-3 system alone. High ozone concentration and pH could enhance COU removal, and overdose SPC has an inhibition effect as CO32- could react with center dot OH. Furtherly, the generation of hydroxyl radicals (center dot OH) via a chain reaction in O-3 was ascertained based on indirect alcohols quenching tests and direct electron spin resonance (ESR) spin-trapping tests, though high initial SPC concentration led to no trapping of center dot OH by 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) in O-3/SPC. According to the concentration of dissolved ozone and prior study, a fast reaction kinetic model was estimated firstly for O-3/SPC system and well fitted with different condition. The hydroxylated intermediates of 7-hydroxylcoumarin and 6,7-hydroxylcoumarin were recognized and the degradation pathways were proposed. The findings of the study can broaden the research direction of SPC and provide a new application information for SPC in environmental pollution control. (C) 2018 Elsevier Ltd. All rights reserved.
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