Heterogeneous activation of H2O2/Na2S2O8 with iron ore from water distribution networks for pollutant removal

In this study, we investigated using the main composition of pipe deposits from water distribution networks as catalyst to activate dual-oxidant H2O2/Na2S2O8 system to produce radicals for perchloroethylene and chloramphenicol removal. According to the results, the degradation efficiency of perchlor...

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Bibliographic Details
Published in:Water science and technology 2022-03, Vol.85 (6), p.1813-1823
Main Authors: Zhong, Dan, He, Fu, Ma, Wencheng, Wu, Yichuan, Dong, Jiaju
Format: Article
Language:English
Subjects:
Adsorption
Catalysts
Chemicals
Chloramphenicol
Chloromycetin
Chromatography
Contamination
Degradation
Degradation products
Distribution
dual-oxidant
Electron paramagnetic resonance
Electron spin resonance
Electrons
Hydrogen peroxide
hydroxyl radical
Hydroxylamine
Hydroxylamines
Iron
Iron ores
Liquid chromatography
Mass spectrometry
Mass spectroscopy
Morphology
Oxidants
Oxidation
Oxidizing agents
Perchloroethylene
Pipes
Pollutant removal
Pollutants
Radiation
Radicals
Removal
Resource utilization
Scavenging
Sodium persulfate
Spectrum analysis
synergistic effect
Tetrachloroethylene
Water distribution
Water engineering
Water pollution
Water treatment
γ-feooh
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Summary:In this study, we investigated using the main composition of pipe deposits from water distribution networks as catalyst to activate dual-oxidant H2O2/Na2S2O8 system to produce radicals for perchloroethylene and chloramphenicol removal. According to the results, the degradation efficiency of perchloroethylene by H2O2/Na2S2O8 system was 92.05% within 8 h. Due to the slow conversion between ≡Fe3+ and ≡Fe2+, the hydroxylamine was introduced to reduce reaction time. As for the results, the degradation efficiency of chloramphenicol in the H2O2/Na2S2O8 system with hydroxylamine assistance was 73.31% within 100 min. Meanwhile, several key affecting factors and the kinetic models were investigated. The primary radicals were identified by electron paramagnetic resonance and radical scavenging tests. Eleven degradation products were confirmed by high-resolution liquid chromatography-mass spectrometry. The result of this study provided the theoretical basis for resource utilization of pipe deposits in water treatment in case of emerging contamination events.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2022.073