Graphene oxide/titania photocatalytic ozonation of primidone in a visible LED photoreactor.
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| Title: | Graphene oxide/titania photocatalytic ozonation of primidone in a visible LED photoreactor. |
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| Authors: | Checa, M.1 (AUTHOR), Figueredo, M.1 (AUTHOR), Aguinaco, A.2 (AUTHOR), Beltrán, F.J.1 (AUTHOR) fbeltran@unex.es |
| Source: | Journal of Hazardous Materials. 5/5/2019, Vol. 369, p70-78. 9p. |
| Subjects: | Graphene oxide, Ozonization, Visible spectra, Reflectance spectroscopy, Hydroxyl group |
| Abstract: | Graphical abstract Highlights • GO-TiO 2 catalysts were synthetized and tested for photocatalytic ozonation. • Ozone processes completely remove Primidone from water in minutes. • TiO 2 becomes a visible active catalyst with GO and ozone. • Combination of ozone, GO-TiO 2 and visible light is needed for mineralization. • Catalyst reusability test shows high mineralization after 3 runs. Abstract A graphene oxide-titania (GO/TiO 2) composite was synthesized via sol-gel method, and studied in aqueous Primidone mineralization with ozone and LED visible light. The photocatalyst was characterized by different techniques (XRD, TEM, SBET, TGA, UV–vis diffuse reflectance spectroscopy). The band gap value decrease from 3.14 eV for bare TiO 2 samples to 2.5 eV in GO/TiO 2 composites clearly shows the interaction of GO with TiO 2 structure. Approximately 20 mg L−1 of Primidone was removed in less than 20 min if ozone was applied, regardless of the presence or absence of light and catalyst. However, reactivity tests show a synergism effect between photocatalysis and ozonation for mineralization purposes. The combination of ozone and GO improved the activation of TiO 2 under visible light. Process optimization led us to select a catalyst dosage of 0.25 g L−1, a light radiance of 359 W m−2 and a GO loading in the catalyst around 0.75%. At these conditions, with photocatalytic ozonation, the presence of GO in the catalyst improved mineralization up to 82% in 2 h compared to 70% reached with bare TiO 2. Catalyst reusability shows no decrease of photocatalytic activity. Scavenger tests point to hydroxyl radicals as the main species responsible for Primidone removal. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Hazardous Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 135660489 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Graphene oxide/titania photocatalytic ozonation of primidone in a visible LED photoreactor. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Checa%2C+M%2E%22">Checa, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Figueredo%2C+M%2E%22">Figueredo, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aguinaco%2C+A%2E%22">Aguinaco, A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Beltrán%2C+F%2EJ%2E%22">Beltrán, F.J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fbeltran@unex.es</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Hazardous+Materials%22">Journal of Hazardous Materials</searchLink>. 5/5/2019, Vol. 369, p70-78. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Graphene+oxide%22">Graphene oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Ozonization%22">Ozonization</searchLink><br /><searchLink fieldCode="DE" term="%22Visible+spectra%22">Visible spectra</searchLink><br /><searchLink fieldCode="DE" term="%22Reflectance+spectroscopy%22">Reflectance spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Hydroxyl+group%22">Hydroxyl group</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Graphical abstract Highlights • GO-TiO 2 catalysts were synthetized and tested for photocatalytic ozonation. • Ozone processes completely remove Primidone from water in minutes. • TiO 2 becomes a visible active catalyst with GO and ozone. • Combination of ozone, GO-TiO 2 and visible light is needed for mineralization. • Catalyst reusability test shows high mineralization after 3 runs. Abstract A graphene oxide-titania (GO/TiO 2) composite was synthesized via sol-gel method, and studied in aqueous Primidone mineralization with ozone and LED visible light. The photocatalyst was characterized by different techniques (XRD, TEM, SBET, TGA, UV–vis diffuse reflectance spectroscopy). The band gap value decrease from 3.14 eV for bare TiO 2 samples to 2.5 eV in GO/TiO 2 composites clearly shows the interaction of GO with TiO 2 structure. Approximately 20 mg L−1 of Primidone was removed in less than 20 min if ozone was applied, regardless of the presence or absence of light and catalyst. However, reactivity tests show a synergism effect between photocatalysis and ozonation for mineralization purposes. The combination of ozone and GO improved the activation of TiO 2 under visible light. Process optimization led us to select a catalyst dosage of 0.25 g L−1, a light radiance of 359 W m−2 and a GO loading in the catalyst around 0.75%. At these conditions, with photocatalytic ozonation, the presence of GO in the catalyst improved mineralization up to 82% in 2 h compared to 70% reached with bare TiO 2. Catalyst reusability shows no decrease of photocatalytic activity. Scavenger tests point to hydroxyl radicals as the main species responsible for Primidone removal. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Hazardous Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jhazmat.2019.02.025 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 70 Subjects: – SubjectFull: Graphene oxide Type: general – SubjectFull: Ozonization Type: general – SubjectFull: Visible spectra Type: general – SubjectFull: Reflectance spectroscopy Type: general – SubjectFull: Hydroxyl group Type: general Titles: – TitleFull: Graphene oxide/titania photocatalytic ozonation of primidone in a visible LED photoreactor. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Checa, M. – PersonEntity: Name: NameFull: Figueredo, M. – PersonEntity: Name: NameFull: Aguinaco, A. – PersonEntity: Name: NameFull: Beltrán, F.J. IsPartOfRelationships: – BibEntity: Dates: – D: 05 M: 05 Text: 5/5/2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 03043894 Numbering: – Type: volume Value: 369 Titles: – TitleFull: Journal of Hazardous Materials Type: main |
| ResultId | 1 |
