Peroxydisulfate activation by LaNiO3 nanoparticles with different morphologies for the degradation of organic pollutants.
Water Sci Technol
; 85(1): 39-51, 2022 Jan.
Article
em En
| MEDLINE
| ID: mdl-35050864
A series of LaNiO3 perovskite nanoparticles with different morphologies, such as spheres, rods and cubes, were prepared through co-precipitation and hydrothermal methods, and used as the catalysts for peroxydisulfate (PDS) activation. The physical and chemical characterization of LaNiO3 perovskites was performed, including X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen isotherm absorption (BET), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS). The LaNiO3 with different shapes showed different activities in Acid Orange 7 (AO7) degradation. Sphere-like LaNiO3 exhibited the highest catalytic activity, which is probably due to the largest specific surface area, higher proportion of reductive Ni2+ and the higher electron transfer ability. The radical scavenging experiments and electron paramagnetic resonance (EPR) revealed the production of massive sulfate radicals (SO4â¢-) and hydroxyl radicals (â¢OH) during the oxidation. Finally, the possible mechanisms of PDS activation and AO7 degradation were proposed. The prepared LaNiO3 perovskites also showed excellent reusability and stability.
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1
Base de dados:
MEDLINE
Assunto principal:
Poluentes Ambientais
/
Nanopartículas
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article