Synthesis of semiconductors of different compositions and their absorption capacity in the UV-A region
DOI:
https://doi.org/10.14295/bjs.v2i8.346Keywords:
photocatalysts, electrospinning, photoactivity, O2 vacancy, degradationAbstract
Photocatalysts are semiconductor solids that are characterized by converting the energy contained in photons (light) into electrochemical energy available in a chemical system, both for oxidation and for the reduction of chemical compounds or species (ions). The application of TiO2 in heterogeneous photocatalysis acquires relevance due to its efficiency in the decomposition of water and air pollutants, bacteria, cancer cells and in the degradation of toxic organic compounds. Thus, this work aimed to synthesize by electrospinning TiO2 and TiO2 fibers doped with H2WO4 or Na2WO4.2H2O. These samples were heat treated between 650 ºC and 800 ºC. Characterized as: scanning electron microscopy (SEM) morphology, X-ray diffraction (XRD) crystalline phases, and photoactivity by degradation tests of 125 mL of a 20 ppm solution of methyl orange dye. The results show that the TiO2/Na2WO4.2H2O (800 ºC) sample is more effective in dye degradation, possibly due to the existence of a synchronicity between the chemical and physical properties of titanium and tungsten oxides and the formation of O2 vacancies.
References
Bharti, B., Kumar, S., Lee, H. N., & Kumar, R. (2016). Formation of oxygen vacancies and Ti3+ state in TiO2 thin film and enhanced optical properties by air plasma treatment. Scientific Reports, 6, 1-12. https://doi.org/10.1038/srep32355 DOI: https://doi.org/10.1038/srep32355
Feltrin, J., Sartor, M. N., Bernardin, A. M., Hotza, D., & Labrincha, J. A. (2013). Photocatalytic surfaces of titania on ceramic substrates: Part I: Synthesis, structure and photoactivity. Cerâmica, 59(352), 620-632. https://doi.org/10.1590/S0366-69132013000400020 DOI: https://doi.org/10.1590/S0366-69132013000400020
Gonçalves, Í. G., & Petter, C. O. (2007). Teoria de Kubelka-Munk aplicada na indústria de minerais industriais: predição do teor de contaminantes em caolim. Revista Escola de Minas, 60(3), 491–496. https://doi.org/10.1590/S0370-44672007000300009 DOI: https://doi.org/10.1590/S0370-44672007000300009
Rahimi, N. R. A. Pax, E. G. Mac. (2016). Review of functional titanium oxides. I: TiO2 and its modifications. Progress in Solid State Chemistry, 44, 86-105. https://doi.org/10.1016/j.progsolidstchem.2016.07.002 DOI: https://doi.org/10.1016/j.progsolidstchem.2016.07.002
Silva, L. G. S. (2013). Obtenção por electrospinning e caracterização de fibras nanoestruturadas de TiO2 e sua aplicação fotocatalítica. Dissertação de Mestrado, Universidade Federal do Rio Grande do Sul.
Silva, L. G. (2018). Correlação entre as propriedades fotocrômicas e atividade fotocatalítica dos óxidos de titânio e tungstênio. Tese de Doutorado, Universidade Federal do Rio Grande do Sul.
Silva, L. G. S. (2020). In: Anais 64º Congresso Brasileiro de Cerâmica, São Paulo, 1, 561-570.
Silva, L. G. S. (2020). In: Anais 64º Congresso Brasileiro de Cerâmica, São Paulo, 1, 571-581.
Soares, L. G., Alves, A. (2018). Photocatalytic properties of TiO2 and TiO2/WO3 films applied as semiconductors in heterogeneous photocatalysis. Materials Letters, 211(15), 339-342. https://doi.org/10.1016/j.matlet.2017.10.023 DOI: https://doi.org/10.1016/j.matlet.2017.10.023
Tobaldi, D. M., Pullar, R. C., Gualtieri, A. F., Seabra, M. P., Labrincha, J. A. (2013). Sol–gel synthesis, characterisation and photocatalytic activity of pure, W-, Ag- and W/Ag co-doped TiO2 nanopowders. Chemical Engineering Journal, 214, 364–375. http://dx.doi.org/10.1016/j.cej.2012.11.018 DOI: https://doi.org/10.1016/j.cej.2012.11.018
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