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Visible-Light-Driven AO7 Photocatalytic Degradation and Toxicity Removal at Bi-Doped $SrTiO_{3}$
| Content Provider | MDPI |
|---|---|
| Author | Lurdes, Ciríaco Nunes, Maria João Lopes, Ana Pacheco, Maria José |
| Copyright Year | 2022 |
| Description | In this study, Bi-doped $SrTiO_{3}$ perovskites $(Sr_{1−x}Bi_{x}TiO_{3}$, 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 $L^{−1}$), when compared with the undoped $SrTiO_{3}$, with an increase in relative $Abs_{484 nm}$ decay from 3.7% to ≥67.8% after 1 h, for a powder suspension of 0.2 g $L^{−1}$. The best photocatalytic activity was exhibited by the $Sr_{0.95}Bi_{0.05}TiO_{3}$ perovskite. Reusability studies showed no significant loss in photocatalytic activity under visible light. The final solutions showed no toxicity towards D. magna, proving the efficiency of $Sr_{0.95}Bi_{0.05}TiO_{3}$ as a visible-light-driven photocatalyst to degrade both the AO7 dye as well as its toxic by-products. A degradation mechanism is proposed. |
| Starting Page | 2465 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma15072465 |
| Journal | Materials |
| Issue Number | 7 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-03-27 |
| Access Restriction | Open |
| Subject Keyword | Materials Environmental Sciences Perovskite Bi-doped Srtio3 Visible Light Photocatalysis Ao7 Toxicity |
| Content Type | Text |
| Resource Type | Article |
