Synthesis of novel ZnO/carbon xerogel composites:Effect of carbon content and calcination temperature on their strutural and photocatalytic properties (2019)
- Authors:
- USP affiliated authors: RODRIGUES, LIANA ALVARES - EEL ; SILVA, MARIA LÚCIA CAETANO PINTO DA - EEL ; BACETTO, LETÍCIA ARAUJO - EEL ; SANTOS, GABRIELA SPIRANDELLI DOS - EEL ; MORAES, NÍCOLAS PERCIANI DE - EEL
- Unidade: EEL
- DOI: 10.1016/j.ceramint.2018.11.027
- Subjects: FOTOCATÁLISE; TANINO; AZUL DE METILENO
- Keywords: Methylene blue; Zinc oxide; Carbon xerogel
- Agências de fomento:
- Language: Inglês
- Abstract: This paper reports the development of new ZnO/carbon xerogel composites (XZn w) for photocatalytic applications. The use of black wattle tannin as a precursor to the carbon xerogel aimed at reducing costs and environmental impacts. The composites were characterized by diffuse reflectance spectroscopy (DRS), BET surface area, scanning electron microscopy (FEG-SEM), X-ray photoelectron spectroscopy (XPS), energy dispersive spectroscopy (EDS), infrared spectroscopy (IR), and X-ray diffraction (XRD). The photocatalytic performance of the materials was evaluated in the decomposition process of methylene blue, a known toxic pollutant. The impacts of the catalyst dosage and calcination temperature on the photocatalytic process were also examined systematically. The X-ray profiles of the XZn w evidenced the existence of the hexagonal structure of the zinc oxide (wurtzite) in the composites. The XPS and XRD analyses confirmed the incorporation of carbon in the zinc oxide crystalline structure. The higher carbon content resulted in a larger surface area. All composites presented the ability to absorb radiation in less energetic wavelengths, contrary to pure zinc oxide that only absorbs radiation of wavelengths below 420 nm. The optimal dosage and calcination temperature were found to be 0.2 g L−1 and 300 °C. All the developed composites displayed significant photocatalytic activities in the decomposition of methylene blue under both visible and solar light. The composites had superior photocatalytic efficiency under visible light when compared to pure zinc oxide. The XZn 0.5 presented the best degradation efficiency under visible radiation. All materials presented similar photocatalytic responses under solar light, evidencing the synergy between the carbon xerogel and the zinc oxide.The photocatalytic mechanism was evaluated by trapping experiments to be mainly controlled by the electron vacancies that are generated during the photoexcitation of the composites.
- Imprenta:
- Source:
- Título do periódico: Ceramics international
- ISSN: 02728842
- Volume/Número/Paginação/Ano: v., n. , p.3657-3667, 2019
- Este periódico é de assinatura
- Este artigo NÃO é de acesso aberto
- Cor do Acesso Aberto: closed
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ABNT
MORAES, Nicolas Perciani et al. Synthesis of novel ZnO/carbon xerogel composites:Effect of carbon content and calcination temperature on their strutural and photocatalytic properties. Ceramics international, n. , p. 3657-3667, 2019Tradução . . Disponível em: https://doi.org/10.1016/j.ceramint.2018.11.027. Acesso em: 06 jun. 2024. -
APA
Moraes, N. P., Bacetto, L. A., Santos, G. S. dos, Silva, M. L. C. P. da, Machado, J. P. B., Campos, T. M. B., et al. (2019). Synthesis of novel ZnO/carbon xerogel composites:Effect of carbon content and calcination temperature on their strutural and photocatalytic properties. Ceramics international, ( ), 3657-3667. doi:10.1016/j.ceramint.2018.11.027 -
NLM
Moraes NP, Bacetto LA, Santos GS dos, Silva MLCP da, Machado JPB, Campos TMB, Thim GP, Rodrigues LA. Synthesis of novel ZnO/carbon xerogel composites:Effect of carbon content and calcination temperature on their strutural and photocatalytic properties [Internet]. Ceramics international. 2019 ;( ): 3657-3667.[citado 2024 jun. 06 ] Available from: https://doi.org/10.1016/j.ceramint.2018.11.027 -
Vancouver
Moraes NP, Bacetto LA, Santos GS dos, Silva MLCP da, Machado JPB, Campos TMB, Thim GP, Rodrigues LA. Synthesis of novel ZnO/carbon xerogel composites:Effect of carbon content and calcination temperature on their strutural and photocatalytic properties [Internet]. Ceramics international. 2019 ;( ): 3657-3667.[citado 2024 jun. 06 ] Available from: https://doi.org/10.1016/j.ceramint.2018.11.027 - Synthesis of novel ZnO/carbon xerogel composites: Effect of carbon content and calcination temperature on their structural and photocatalytic properties
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Informações sobre o DOI: 10.1016/j.ceramint.2018.11.027 (Fonte: oaDOI API)
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