Synergetic effect of photocatalysis and peroxymonosulfate activation by CoTiO3/SBA-15, NiTiO3/SBA-15 and Fe2TiO5/SBA-15 for efficient photocatalytic removal of oxytetracycline hydrochloride

Nanosized CoTiO3, NiTiO3 and Fe2TiO5 photocatalysts were synthesized by a simple sol–gel method successfully. However, they showed lower photocatalytic activity for the degradation of oxytetracycline hydrochloride under visible light irradiation. After the CoTiO3, NiTiO3 and Fe2TiO5 nanoparticles we...

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Bibliographic Details
Published inEnvironmental science water research & technology Vol. 8; no. 8; pp. 1763 - 1776
Main Authors Li, Di, Long, Mingyang, Zhao, Qianqian, Li, Hongmiao, Wen, Qi, Song, Fang
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 28.07.2022
Subjects
Analytical methods
Antibiotics
Catalytic activity
Coordination compounds
Degradation
Electron paramagnetic resonance
Electron spin
Electron spin resonance
Electron transfer
Electrons
Gels
Irradiation
Light irradiation
Metals
Nanoparticles
Nickel compounds
Oxidoreductions
Oxytetracycline
Photocatalysis
Photodegradation
Photoelectric effect
Photoelectron spectroscopy
Photoelectrons
Removal
Sol-gel processes
Spin resonance
Titanates
Transition metals
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Summary:Nanosized CoTiO3, NiTiO3 and Fe2TiO5 photocatalysts were synthesized by a simple sol–gel method successfully. However, they showed lower photocatalytic activity for the degradation of oxytetracycline hydrochloride under visible light irradiation. After the CoTiO3, NiTiO3 and Fe2TiO5 nanoparticles were loaded in the SBA-15 channels, the photocatalytic activity was enhanced obviously. In order to further enhance the removal efficiency of CoTiO3/SBA-15, NiTiO3/SBA-15 and Fe2TiO5/SBA-15, they were used to activate peroxymonosulfate under visible light irradiation. In particular, CoTiO3/SBA-15 could completely photodegrade oxytetracycline hydrochloride with the assistance of peroxymonosulfate in an hour. The influencing factors on activating peroxymonosulfate to degrade oxytetracycline hydrochloride were investigated in detail. In addition, the electron transfer and peroxymonosulfate activation mechanism for the efficient improvement in the photocatalytic performance were also proposed and proved by radical quenching experiments, electron spin resonance analysis, X-ray photoelectron spectroscopy, transient photocurrent responses and cyclic voltammetry. It was found that the combined activation effects of photogenerated electrons and transition metals on peroxymonosulfate to produce sulfate radicals could enhance the degradation efficiency obviously. This study could provide a new way for the synergetic effect of photocatalysis and peroxymonosulfate activation by transition metal to be used for efficient photocatalytic degradation in the field of antibiotic removal.
ISSN:2053-1400
2053-1419
DOI:10.1039/d2ew00060a