Fabrication of La<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> Heterojunction with Enhanced Photocatalytic Performance of Tetracycline Hydrochloride
In this study, La<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunction photocatalysts doped with different dosages of La<sub>2</sub>O<sub>3</sub> were constructed by a facile ultrasound-assisted calcination appro...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/5b2ad3f4038f49019ef13885d9b9375b |
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| Sumario: | In this study, La<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunction photocatalysts doped with different dosages of La<sub>2</sub>O<sub>3</sub> were constructed by a facile ultrasound-assisted calcination approach. The as-prepared photocatalysts were characterized by XRD, FTIR, FESEM, TEM, XPS, PL and DRS to verify the composite photocatalysts’ purity and to investigate their structural, morphological and elemental composition, and their energy band. According to the results, a type of pure rod–sheet-shaped, heterostructured nanoparticle was successfully obtained. Decorated with 10% La<sub>2</sub>O<sub>3</sub>, 2 g/L of the composite sample had a 93% degradation rate for 20 mg/L tetracycline hydrochloride within 2 h under visible light at a pH of 7. After four successive photocatalytic runs, satisfactory stability and reusability was exhibited, with 70% of the tetracycline hydrochloride being removed in the final experiment. Electrons (e<sup>−</sup>), photogenerated holes (h<sup>+</sup>), superoxide radical anions (·O<sub>2</sub><sup>−</sup>) and hydroxyl radicals (·OH) were the fundamental active species during the photocatalytic process and were investigated via quenching experiments. Furthermore, possible photocatalytic mechanisms were analyzed in this work. |
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