UV-activated permanganate process for micro-organic pollutant degradation: efficiency, mechanism and influencing factors

Ultraviolet-activated permanganate (UV/PM) process is a novel advanced oxidation process (AOP), but its application potential remains to be evaluated. This work investigates the degradation of refractory organic pollutant by UV/PM in terms of efficiency, mechanism, and influencing factors. The targe...

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Bibliographic Details
Published in:Water science and technology 2021-03, Vol.83 (6), p.1278-1285
Main Authors: Ye, Miaomiao, Li, Chengzhuo, Liu, Xiaowei, Wang, Lili, Chen, Rong
Format: Article
Language:English
Subjects:
Acids
active manganese species
Benzoic acid
Bicarbonates
Chlorine
Constants
Degradation
Efficiency
Electron paramagnetic resonance
Electron spin resonance
Environmental Pollutants
Hydrogen Peroxide
hydroxyl radical
Hydroxyl radicals
Kinetics
Ligands
Manganese
Manganese Compounds
Mineralization
Optimization
Oxidation
Oxidation process
Oxidation-Reduction
Oxides
Performance degradation
permanganate
Photolysis
Pollutants
Potassium
Rate constants
Sodium
Spectrum analysis
Ultraviolet radiation
Ultraviolet Rays
uv activation
Water Pollutants, Chemical - analysis
Water Purification
Water treatment
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Summary:Ultraviolet-activated permanganate (UV/PM) process is a novel advanced oxidation process (AOP), but its application potential remains to be evaluated. This work investigates the degradation of refractory organic pollutant by UV/PM in terms of efficiency, mechanism, and influencing factors. The target compound benzoic acid (BA), which is a micro-organic pollutant and is resistant to PM and UV treatment, can be efficiently degraded by UV/PM. The electron paramagnetic resonance spectra directly supported the formation of hydroxyl radical (HO•) and superoxide radical (O ) from UV photolysis of PM. Competitive kinetics experiments verified that O acted as precursor of HO• and the good degradation performance of BA was due to the involvement of HO• and manganese(V). The rate constants of BA degradation showed a positive linear relationship with PM dosage in the range of 0.5-20 mg·L , and the degradation process was significantly influenced by solution pH and natural organic matters but insensitive to chloride and bicarbonate at environmentally relevant concentrations. Compared to the typical UV-based AOP UV/hydrogen peroxide, UV/PM is a little inferior, indicating that optimization and enhancement is needed for this process before its possible practical application.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2021.068