%0 Journal Article
%@nexthigherunit 8JMKD3MGPCW/3ESR3H2
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%@resumeid 8JMKD3MGP5W/3C9JHER
%N 3
%@secondarytype PRE PI
%@usergroup simone
%P 3657-3667
%4 sid.inpe.br/mtc-m21c/2019/01.03.10.51
%X 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.
%8 Feb.
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%@group LABAS-COCTE-INPE-MCTIC-GOV-BR
%3 moraes_synthesis.pdf
%@secondarymark A1_INTERDISCIPLINAR A1_ENGENHARIAS_III A1_ENGENHARIAS_II A1_ENGENHARIAS_I A2_MATERIAIS A2_ENGENHARIAS_IV A2_CIÊNCIAS_AGRÁRIAS_I B1_GEOCIÊNCIAS B1_ARQUITETURA_E_URBANISMO B2_QUÍMICA B2_ODONTOLOGIA B2_ENSINO B2_BIOTECNOLOGIA B3_ASTRONOMIA_/_FÍSICA B5_CIÊNCIAS_AMBIENTAIS
%@issn 0272-8842
%@affiliation Universidade de São Paulo (USP)
%@affiliation Universidade de São Paulo (USP)
%@affiliation Universidade de São Paulo (USP)
%@affiliation Universidade de São Paulo (USP)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Tecnológico de Aeronáutica (ITA)
%@affiliation Instituto Tecnológico de Aeronáutica (ITA)
%@affiliation Universidade de São Paulo (USP)
%D 2019
%A Moraes, Nicolas Perciani,
%A Bacetto, Letícia Araujo,
%A Santos, Gabriela Spirandelli dos,
%A Silva, Maria Lucia Caetano Pinto da,
%A Machado, João Paulo Barros,
%A Campos, Tiago Moreira Bastos,
%A Thim, Gilmar Patrocínio,
%A Rodrigues, Liana Alvares,
%@area FISMAT
%9 journal article
%T Synthesis of novel ZnO/carbon xerogel composites: Effect of carbon content and calcination temperature on their structural and photocatalytic properties
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress joao.machado@inpe.br
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress liana.r@usp.br
%B Ceramics International
%@versiontype publisher
%V 45
%@dissemination WEBSCI; PORTALCAPES; COMPENDEX.
%K Zinc oxide, Photocatalysis, Carbon xerogel, Tannin, Methylene blue.
%2 sid.inpe.br/mtc-m21c/2019/01.03.10.51.44
%@documentstage not transferred
%@doi 10.1016/j.ceramint.2018.11.027
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}