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Synthesis and characterization of TiO2 and TiO2/Ag for use in photodegradation of methylviologen, with kinetic study by laser flash photolysis

  • Advanced Oxidation Technologies: Advances and Challenges in IberoAmerican Countries
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Abstract

This paper reports the synthesis, characterization, and application of TiO2 and TiO2/Ag nanoparticles for use in photocatalysis, employing the herbicide methylviologen (MV) as a substrate for photocatalytic activity testing. At suitable metal to oxide ratios, increases in silver surface coating on TiO2 enhanced the efficiency of heterogeneous photocatalysis by increasing the electron transfer constant. The sol–gel method was used for TiO2 synthesis. P25 TiO2 was the control material. Both oxides were subjected to the same silver incorporation process. The materials were characterized by conventional spectroscopy, SEM micrography, X-ray diffraction, calculation of surface area per mass of catalyst, and thermogravimetry. Also, electron transfers between TiO2 or TiO2/Ag and MV in the absence and presence of sodium formate were investigated using laser flash photolysis. Oxides synthesized with 2.0 % silver exhibited superior photocatalytic activity for MV degradation.

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Acknowledgments

The authors wish to thank the Brazilian funding agencies CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), and FUNDECT (Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul) for their financial support. A.M.Jr. is associated with NAP-PhotoTech, the USP Research Consortium for Photochemical Technology, and INCT-EMA (Instituto Nacional de Ciência e Tecnologia de Estudos do Meio Ambiente).

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal de Mato Grosso do Sul, Av. Senador Filinto Muller, 1555, CP 549, Campo Grande, MS, 79074-460, Brazil

    Dayana Doffinger Ramos, Paula C. S. Bezerra, Gleison A. Casagrande, Silvio C. Oliveira, Márcio R. S. Oliveira, Lincoln C. S. Oliveira, Valdir S. Ferreira & Amilcar Machulek Jr.

  2. Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, CP 26077, São Paulo, SP, 05513-970, Brazil

    Frank H. Quina

  3. Departament d’Enginyeria Química, Universitat de Barcelona, Martí i Franquès, 1, 08028, Barcelona, Spain

    Renato F. Dantas

  4. Instituto de Física, Universidade Federal de Mato Grosso do Sul, Av. Senador Filinto Muller, 1555, CP 549, Campo Grande, MS, 79074-460, Brazil

    Samuel L. Oliveira

Authors
  1. Dayana Doffinger Ramos
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  2. Paula C. S. Bezerra
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  3. Frank H. Quina
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  4. Renato F. Dantas
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  5. Gleison A. Casagrande
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  6. Silvio C. Oliveira
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  7. Márcio R. S. Oliveira
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  8. Lincoln C. S. Oliveira
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  9. Valdir S. Ferreira
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  10. Samuel L. Oliveira
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  11. Amilcar Machulek Jr.
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Correspondence to Amilcar Machulek Jr..

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Responsible editor: Philippe Garrigues

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Ramos, D.D., Bezerra, P.C.S., Quina, F.H. et al. Synthesis and characterization of TiO2 and TiO2/Ag for use in photodegradation of methylviologen, with kinetic study by laser flash photolysis. Environ Sci Pollut Res 22, 774–783 (2015). https://doi.org/10.1007/s11356-014-2678-1

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  • DOI: https://doi.org/10.1007/s11356-014-2678-1

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