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New insight into the mechanism of peroxymonosulfate activation by nanoscaled lead-based spinel for organic matters degradation: A singlet oxygen-dominated oxidation process
- Source :
- Journal of colloid and interface science. 572
- Publication Year :
- 2020
-
Abstract
- Crystalline iron-based nanoparticles with spinel structure have received great attention for catalyzing peroxymonosulfate (PMS). This study introduces lead ferrite (PbFe2O4) as a novel, simple, and efficient catalyst to activate PMS for the degradation of organic contaminants in aqueous solution. The results indicated that, under pH 9.0, nearly 100% of 10 μM thionine was removed in 20 min. Operation factors, including pH, oxidant concentrations, catalyst dosage, and coexisting ions, were investigated and found to be influential for the thionine removal. PbFe2O4 showed higher catalytic activity and lower ions leaching than well-crystallized lead oxide (PbO) and ferric oxide (Fe2O3). The results from the characterization of the PbFe2O4 with X-ray diffraction (XRD) before and after reaction suggested that the structure and properties of the catalyst kept stable, and the recovered catalyst exhibited good catalytic performance during the recycling batch experiments. Free radical quenching experiments and electron paramagnetic resonance (EPR) spectra revealed that singlet-oxygen (1O2) is the dominant active oxygen species rather than sulfate radical for thionine degradation in PbFe2O4/PMS system. Meanwhile, the possible pathways of 1O2 generation were proposed: the redox reaction between Pb(Ⅳ)/Pb(II) and PMS may play an key role in PMS activation. This study provides an interesting insight in PMS activation by the high-efficient non-radical process, and the PbFe2O4 could be as efficient and recyclable heterogeneous catalyst for organic degradation.
- Subjects :
- Singlet oxygen
Inorganic chemistry
Oxide
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Heterogeneous catalysis
01 natural sciences
Redox
Thionine
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Catalysis
Biomaterials
chemistry.chemical_compound
Colloid and Surface Chemistry
chemistry
medicine
Ferric
0210 nano-technology
medicine.drug
Lead oxide
Subjects
Details
- ISSN :
- 10957103
- Volume :
- 572
- Database :
- OpenAIRE
- Journal :
- Journal of colloid and interface science
- Accession number :
- edsair.doi.dedup.....7a365bf8549ef4dbc94516feca5c5790