Building synergism through heterojunction of n-CaTiO3 with p-CaFe2O4 for upgraded photocatalytic degradation of pharmaceuticals
2022
Bilgin Simsek, Esra | Tuna, Özlem
Herein, n-type CaTiO₃ was constructed with p-type CaFe₂O₄ through in-situ growth method and the as-prepared heterostructure (CTO@CFO) was tested in photocatalytic degradation of persistent pharmaceutical under simulated sunlight. The heterojunction could harvest more visible light, suppress recombination owing to new oxygen vacancies and strong interfacial interaction. SEM and TEM images verified the attachment of tiny-rod CaFe₂O₄ around CaTiO₃ nanoplates while the CaFe₂O₄ growth was observed by XRD and HRTEM analyses. Benefiting from p-n heterojunction, the optimal CTO@CFO(0.50) catalyst displayed effective photocatalytic degradation of tetracycline antibiotic (80.81%) which was superior to that of pristine CaTiO₃ (20.8%) and CaFe₂O₄ (45.1%) catalysts. Radical scavenging tests showed that the photo-induced holes were the main active species in the reaction and the underlying degradation mechanism was discussed. This study examines a novel p-n heterojunction between titanate and ferrite type materials that contribute a scientific basis for design of efficient and cost-effective photocatalysts.
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