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] |
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| Database: | Engineering Source |
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