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High performance of Ag/BiVO4 photocatalyst for 2,4-Dichlorophenoxyacetic acid degradation under visible light

Sánchez, Orlando A. ; Rodríguez, Julia L. ; Barrera-Andrade, José M. ; Borja-Urby, Raúl ; Valenzuela, Miguel A.

Applied catalysis. A, General, 2020-06, Vol.600, p.117625, Article 117625 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    High performance of Ag/BiVO4 photocatalyst for 2,4-Dichlorophenoxyacetic acid degradation under visible light
  • Autor: Sánchez, Orlando A. ; Rodríguez, Julia L. ; Barrera-Andrade, José M. ; Borja-Urby, Raúl ; Valenzuela, Miguel A.
  • Assuntos: 2,4-D degradation ; Bismuth oxides ; Bismuth vanadate ; Composites Ag/BiVO4 ; Dichlorophenoxyacetic acid ; Nanoparticles ; Oxalic acid ; Oxidation ; Photocatalysis ; Photodegradation ; Photoelectrons ; Raman spectroscopy ; Silver ; Spectrum analysis ; Vanadates ; Visible light ; X ray spectroscopy
  • É parte de: Applied catalysis. A, General, 2020-06, Vol.600, p.117625, Article 117625
  • Descrição: [Display omitted] •Hydrothermally synthesized BiVO4 was successfully decorated with Ag nanoparticles.•The photogenerated species (h+ and OH▪) promoted the photodegradation of 2,4-D.•Ag/BiVO4 exhibited high mineralization in 2,4-D photodegradation under visible light.•Hydrothermal synthesis leads to better materials for photocatalytic degradation. With the aim of exploring and comparing the photocatalytic degradation of 2,4-Dichlorophenoxyacetic acid (2,4-D) under visible light, BiVO4 was synthesized by using coprecipitation and hydrothermal methods and modified with silver nanoparticles (AgNP) employing a photo-deposition method. X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy were some of the characterization techniques used. A particular synergy was observed when decorating the hydrothermally prepared BiVO4 with AgNP, showing the higher degradation/mineralization of 2,4-D. According to the results, AgNP served as efficient co-catalysts of BiVO4, allowing the electron separation/transfer to generate the OH radicals required for the reaction. A parallel pathway of 2,4-D photodegradation was proposed, including 2,4-Dichlorophenol and oxalic acid as the main intermediary compounds. Active species trapping experiments demonstrated that the photogenerated holes play a fundamental role in promoting both the direct oxidation of 2,4-D and generation of OH radicals.
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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