Synergistic Mechanism of Photocatalysis and Photo-Fenton by Manganese Ferrite and Graphene Nanocomposite Supported on Wood Ash with Real Sunlight Irradiation
The present research aimed to evaluate the photocatalytic activity of reduced graphene oxide and manganese ferrite nanocomposite supported on eucalyptus wood ash waste (WA) from industrial boilers, for the decolorization of methylene blue (MB) solutions, using sunlight as an irradiation source. For...
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| Veröffentlicht in: | Catalysts 2022-07, Vol.12 (7), p.745 |
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| creator | Ferreira, Maria Eliana Camargo Soletti, Lara de Souza Bernardino, Eduarda Gameleira Quesada, Heloise Beatriz Gasparotto, Francielli Bergamasco, Rosângela Yamaguchi, Natália Ueda |
| description | The present research aimed to evaluate the photocatalytic activity of reduced graphene oxide and manganese ferrite nanocomposite supported on eucalyptus wood ash waste (WA) from industrial boilers, for the decolorization of methylene blue (MB) solutions, using sunlight as an irradiation source. For this, the photocatalyst named MnFe2O4-G@WA was synthesized by a solvothermal method and characterized by analyzes of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller and zeta potential. Firstly, the photocatalyst was evaluated for photocatalytic decolorization of MB under different reaction conditions. Then, the influence of pH, photocatalyst dose and H2O2 was evaluated. MnFe2O4-G@WA showed 94% of efficiency for photocatalytic decolorization of MB under operating conditions of solar irradiation, 0.25 g/L of catalyst, 300 mg/L of H2O2. The proposed degradation reaction mechanism suggested that the photodegradation of MB was through a synergistic mechanism of photocatalysis and photo-Fenton reactions, with the combined action of the three materials used. The data adjusted to the first order kinetics from the Langmuir–Hinshelwood model. In addition, MnFe2O4-G@WA showed high stability, maintaining its efficiency above 90% after 5 cycles. The results indicated that the nanophotocatalyst is a potential technology for the decolorization of MB solutions. |
| doi_str_mv | 10.3390/catal12070745 |
| format | Article |
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For this, the photocatalyst named MnFe2O4-G@WA was synthesized by a solvothermal method and characterized by analyzes of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller and zeta potential. Firstly, the photocatalyst was evaluated for photocatalytic decolorization of MB under different reaction conditions. Then, the influence of pH, photocatalyst dose and H2O2 was evaluated. MnFe2O4-G@WA showed 94% of efficiency for photocatalytic decolorization of MB under operating conditions of solar irradiation, 0.25 g/L of catalyst, 300 mg/L of H2O2. The proposed degradation reaction mechanism suggested that the photodegradation of MB was through a synergistic mechanism of photocatalysis and photo-Fenton reactions, with the combined action of the three materials used. The data adjusted to the first order kinetics from the Langmuir–Hinshelwood model. In addition, MnFe2O4-G@WA showed high stability, maintaining its efficiency above 90% after 5 cycles. The results indicated that the nanophotocatalyst is a potential technology for the decolorization of MB solutions.</description><identifier>ISSN: 2073-4344</identifier><identifier>EISSN: 2073-4344</identifier><identifier>DOI: 10.3390/catal12070745</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Adsorption ; Ashes ; Catalysts ; Catalytic activity ; Chemical reactions ; Decoloring ; Dyes ; Efficiency ; Electron microscopy ; Eucalyptus ; Ferrites ; Fourier transforms ; Graphene ; Graphite ; Hydrogen peroxide ; Irradiation ; Manganese ; Methylene blue ; Microscopy ; Nanocomposites ; Nanoparticles ; Oxidation ; Photocatalysis ; Photocatalysts ; Photodegradation ; Pollutants ; Potassium ; Radiation ; Reaction mechanisms ; Semiconductors ; Solar radiation ; Sunlight ; Zeta potential</subject><ispartof>Catalysts, 2022-07, Vol.12 (7), p.745</ispartof><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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For this, the photocatalyst named MnFe2O4-G@WA was synthesized by a solvothermal method and characterized by analyzes of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller and zeta potential. Firstly, the photocatalyst was evaluated for photocatalytic decolorization of MB under different reaction conditions. Then, the influence of pH, photocatalyst dose and H2O2 was evaluated. MnFe2O4-G@WA showed 94% of efficiency for photocatalytic decolorization of MB under operating conditions of solar irradiation, 0.25 g/L of catalyst, 300 mg/L of H2O2. The proposed degradation reaction mechanism suggested that the photodegradation of MB was through a synergistic mechanism of photocatalysis and photo-Fenton reactions, with the combined action of the three materials used. The data adjusted to the first order kinetics from the Langmuir–Hinshelwood model. In addition, MnFe2O4-G@WA showed high stability, maintaining its efficiency above 90% after 5 cycles. The results indicated that the nanophotocatalyst is a potential technology for the decolorization of MB solutions.</description><subject>Adsorption</subject><subject>Ashes</subject><subject>Catalysts</subject><subject>Catalytic activity</subject><subject>Chemical reactions</subject><subject>Decoloring</subject><subject>Dyes</subject><subject>Efficiency</subject><subject>Electron microscopy</subject><subject>Eucalyptus</subject><subject>Ferrites</subject><subject>Fourier transforms</subject><subject>Graphene</subject><subject>Graphite</subject><subject>Hydrogen peroxide</subject><subject>Irradiation</subject><subject>Manganese</subject><subject>Methylene blue</subject><subject>Microscopy</subject><subject>Nanocomposites</subject><subject>Nanoparticles</subject><subject>Oxidation</subject><subject>Photocatalysis</subject><subject>Photocatalysts</subject><subject>Photodegradation</subject><subject>Pollutants</subject><subject>Potassium</subject><subject>Radiation</subject><subject>Reaction mechanisms</subject><subject>Semiconductors</subject><subject>Solar radiation</subject><subject>Sunlight</subject><subject>Zeta potential</subject><issn>2073-4344</issn><issn>2073-4344</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpVUcFOAjEQ3RhNJMrRexPPq-22y-4eCREkATWi8bgZ2ilbAu3alhg-xn91AQ86l3kz782bw0uSG0bvOK_ovYQIG5bRghYiP0t6HeKp4EKc_8GXST-ENe2qYrxkeS_5Xuwt-pUJ0UgyR9mANWFLnCYvjYvu6LoPJhCw6rRKx2ijs2S5J3OwK7AYkIzRexPxqJp4aBu0SJ7AOum2rQsHarFrW-cjKtIdfzinyDA05MvEhrwibDrebsyqiWTqPSgD0Th7nVxo2ATs__ar5H388DZ6TGfPk-loOEslpyKmWVEpphgOmNQc8wJyVgktSt4NgKAqnekyU5JpVQi61JTTfMn4gFVQoOQlv0puT76td587DLFeu5233cs6G1S8GpQi450qPamkdyF41HXrzRb8vma0PoRQ_wuB_wAj-n2a</recordid><startdate>20220701</startdate><enddate>20220701</enddate><creator>Ferreira, Maria Eliana Camargo</creator><creator>Soletti, Lara de Souza</creator><creator>Bernardino, Eduarda Gameleira</creator><creator>Quesada, Heloise Beatriz</creator><creator>Gasparotto, Francielli</creator><creator>Bergamasco, Rosângela</creator><creator>Yamaguchi, Natália Ueda</creator><general>MDPI AG</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><orcidid>https://orcid.org/0000-0002-8806-2454</orcidid></search><sort><creationdate>20220701</creationdate><title>Synergistic Mechanism of Photocatalysis and Photo-Fenton by Manganese Ferrite and Graphene Nanocomposite Supported on Wood Ash with Real Sunlight Irradiation</title><author>Ferreira, Maria Eliana Camargo ; 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For this, the photocatalyst named MnFe2O4-G@WA was synthesized by a solvothermal method and characterized by analyzes of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, Brunauer–Emmett–Teller and zeta potential. Firstly, the photocatalyst was evaluated for photocatalytic decolorization of MB under different reaction conditions. Then, the influence of pH, photocatalyst dose and H2O2 was evaluated. MnFe2O4-G@WA showed 94% of efficiency for photocatalytic decolorization of MB under operating conditions of solar irradiation, 0.25 g/L of catalyst, 300 mg/L of H2O2. The proposed degradation reaction mechanism suggested that the photodegradation of MB was through a synergistic mechanism of photocatalysis and photo-Fenton reactions, with the combined action of the three materials used. The data adjusted to the first order kinetics from the Langmuir–Hinshelwood model. In addition, MnFe2O4-G@WA showed high stability, maintaining its efficiency above 90% after 5 cycles. The results indicated that the nanophotocatalyst is a potential technology for the decolorization of MB solutions.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/catal12070745</doi><orcidid>https://orcid.org/0000-0002-8806-2454</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Adsorption Ashes Catalysts Catalytic activity Chemical reactions Decoloring Dyes Efficiency Electron microscopy Eucalyptus Ferrites Fourier transforms Graphene Graphite Hydrogen peroxide Irradiation Manganese Methylene blue Microscopy Nanocomposites Nanoparticles Oxidation Photocatalysis Photocatalysts Photodegradation Pollutants Potassium Radiation Reaction mechanisms Semiconductors Solar radiation Sunlight Zeta potential |
| title | Synergistic Mechanism of Photocatalysis and Photo-Fenton by Manganese Ferrite and Graphene Nanocomposite Supported on Wood Ash with Real Sunlight Irradiation |
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