Composite soft template-assisted construction of a flower-like β-Bi2O3/Bi2O2CO3 heterojunction photocatalyst for the enhanced simulated sunlight photocatalytic degradation of tetracycline
| Autor: | Yufeng Yao, Ming Shen, Hui Zhou, Songtao Zhong |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Radical Composite number Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Catalysis Chemical engineering law 0103 physical sciences Materials Chemistry Ceramics and Composites Photocatalysis Copolymer Degradation (geology) Calcination 0210 nano-technology |
| Zdroj: | Ceramics International. 45:15036-15047 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2019.04.240 |
| Popis: | A three-dimensional (3D) flower-like β-Bi2O3/Bi2O2CO3 heterojunction photocatalyst was synthesized via decomposition of the precursor fabricated using a composite soft template, which was constructed from dl -aspartic acid and nonionic amphiphilic triblock copolymer (Pluronic F127). The morphology, phase structure, composition, effect of reactant concentration, and possible formation mechanism were systematically studied. The results showed that dl -aspartic acid was chosen as the coordination- and structure-directing agent, while F127 was used as the capping agent during preparation of the precursor. The as-prepared flower-like β-Bi2O3/Bi2O2CO3 heterojunction obtained after calcination of the self-sacrificing precursor at 290 °C showed excellent photocatalytic performance in the degradation of the refractory colorless antibiotic agent tetracycline (TC) under simulated sunlight irradiation, with 98.79% TC degradation being achieved within 60 min of irradiation. This excellent photocatalytic performance was attributed to the narrow band gap, heterojunction structure, and 3D hierarchical structure. The results further revealed that photogenerated holes (h+) and hydroxyl radicals (•OH) dominated the photocatalytic process. Furthermore, the β-Bi2O3/Bi2O2CO3 heterojunction catalyst was not photocorroded after six consecutive cycles, suggesting an excellent photostability. |
| Databáze: | OpenAIRE |
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