Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub>
In this study, Bi-doped SrTiO<sub>3</sub> perovskites (Sr<sub>1−x</sub>Bi<sub>x</sub>TiO<sub>3</sub>, x = 0, 0.03, 0.05, 0.07 and 0.1) were synthesized using the solid-state method, characterized, and tested as photocatalysts in the degradation of the...
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MDPI AG
2022-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/7/2465 |
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| author | Maria João Nunes Ana Lopes Maria José Pacheco Lurdes Ciríaco |
| author_facet | Maria João Nunes Ana Lopes Maria José Pacheco Lurdes Ciríaco |
| author_sort | Maria João Nunes |
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| description | In this study, Bi-doped SrTiO<sub>3</sub> perovskites (Sr<sub>1−x</sub>Bi<sub>x</sub>TiO<sub>3</sub>, x = 0, 0.03, 0.05, 0.07 and 0.1) were synthesized using the solid-state method, characterized, and tested as photocatalysts in the degradation of the azo dye acid orange 7 (AO7) under visible light. The perovskites were successfully synthesized, and XRD data showed a predominant, well-crystallized phase, belonging to the cubic perovskite symmetry. For the doped samples, a minority phase, identified as bismuth titanate, was detected. All doped samples exhibited improved photocatalytic activity under visible light, on the degradation of AO7 (10 mg L<sup>−1</sup>), when compared with the undoped SrTiO<sub>3</sub>, with an increase in relative Abs<sub>484 nm</sub> decay from 3.7% to ≥67.8% after 1 h, for a powder suspension of 0.2 g L<sup>−1</sup>. The best photocatalytic activity was exhibited by the Sr<sub>0.95</sub>Bi<sub>0.05</sub>TiO<sub>3</sub> perovskite. Reusability studies showed no significant loss in photocatalytic activity under visible light. The final solutions showed no toxicity towards <i>D. magna</i>, proving the efficiency of Sr<sub>0.95</sub>Bi<sub>0.05</sub>TiO<sub>3</sub> as a visible-light-driven photocatalyst to degrade both the AO7 dye as well as its toxic by-products. A degradation mechanism is proposed. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:41:56Z |
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| spelling | doaj.art-eabbd65925a249eba7fd29251cab4ccb2023-11-30T23:32:31ZengMDPI AGMaterials1996-19442022-03-01157246510.3390/ma15072465Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub>Maria João Nunes0Ana Lopes1Maria José Pacheco2Lurdes Ciríaco3Fiber Materials and Environmental Technologies (FibEnTech-UBI), Universidade da Beira Interior, R. Marquês de D’Ávila e Bolama, 6200-001 Covilhã, PortugalFiber Materials and Environmental Technologies (FibEnTech-UBI), Universidade da Beira Interior, R. Marquês de D’Ávila e Bolama, 6200-001 Covilhã, PortugalFiber Materials and Environmental Technologies (FibEnTech-UBI), Universidade da Beira Interior, R. Marquês de D’Ávila e Bolama, 6200-001 Covilhã, PortugalFiber Materials and Environmental Technologies (FibEnTech-UBI), Universidade da Beira Interior, R. Marquês de D’Ávila e Bolama, 6200-001 Covilhã, PortugalIn this study, Bi-doped SrTiO<sub>3</sub> perovskites (Sr<sub>1−x</sub>Bi<sub>x</sub>TiO<sub>3</sub>, x = 0, 0.03, 0.05, 0.07 and 0.1) were synthesized using the solid-state method, characterized, and tested as photocatalysts in the degradation of the azo dye acid orange 7 (AO7) under visible light. The perovskites were successfully synthesized, and XRD data showed a predominant, well-crystallized phase, belonging to the cubic perovskite symmetry. For the doped samples, a minority phase, identified as bismuth titanate, was detected. All doped samples exhibited improved photocatalytic activity under visible light, on the degradation of AO7 (10 mg L<sup>−1</sup>), when compared with the undoped SrTiO<sub>3</sub>, with an increase in relative Abs<sub>484 nm</sub> decay from 3.7% to ≥67.8% after 1 h, for a powder suspension of 0.2 g L<sup>−1</sup>. The best photocatalytic activity was exhibited by the Sr<sub>0.95</sub>Bi<sub>0.05</sub>TiO<sub>3</sub> perovskite. Reusability studies showed no significant loss in photocatalytic activity under visible light. The final solutions showed no toxicity towards <i>D. magna</i>, proving the efficiency of Sr<sub>0.95</sub>Bi<sub>0.05</sub>TiO<sub>3</sub> as a visible-light-driven photocatalyst to degrade both the AO7 dye as well as its toxic by-products. A degradation mechanism is proposed.https://www.mdpi.com/1996-1944/15/7/2465perovskiteBi-doped SrTiO<sub>3</sub>visible light photocatalysisAO7toxicity |
| spellingShingle | Maria João Nunes Ana Lopes Maria José Pacheco Lurdes Ciríaco Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub> Materials perovskite Bi-doped SrTiO<sub>3</sub> visible light photocatalysis AO7 toxicity |
| title | Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub> |
| title_full | Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub> |
| title_fullStr | Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub> |
| title_full_unstemmed | Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub> |
| title_short | Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped SrTiO<sub>3</sub> |
| title_sort | visible light driven ao7 photocatalytic degradation and toxicity removal at bi doped srtio sub 3 sub |
| topic | perovskite Bi-doped SrTiO<sub>3</sub> visible light photocatalysis AO7 toxicity |
| url | https://www.mdpi.com/1996-1944/15/7/2465 |
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