Dual-functional Z-scheme CdSe/Se/BiOBr photocatalyst: Generation of hydrogen peroxide and efficient degradation of ciprofloxacin
| Autor: | Chongfei Yu, Shizhan Wang, Haijin Liu, Jing Zhang, Zhansheng Lu, Tian Wang, Jinglan Feng, Can Zhang, Shiyu Nie, Jianhui Sun, Cuiwei Du, Shuying Dong |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Doping chemistry.chemical_element Environmental pollution Heterojunction Hydrogen Peroxide Catalysis Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Selenium Colloid and Surface Chemistry Reaction rate constant chemistry Chemical engineering Ciprofloxacin Photocatalysis Cadmium Compounds Degradation (geology) Hydrogen peroxide Selenium Compounds Bismuth |
| Zdroj: | Journal of colloid and interface science. 606(Pt 2) |
| ISSN: | 1095-7103 |
| Popis: | The major challenges of clean energy and environmental pollution have resulted in the development of photocatalysis technologies for energy conversion and the degradation of refractory pollutants. Herein, a novel CdSe/Se/BiOBr hydrangea-like photocatalyst was used to produce hydrogen peroxide (H2O2) and degrade ciprofloxacin (CIP). The Z-scheme heterojunction structure of the photocatalyst and the doping of selenium (Se) led to the efficient separation of electron-hole pairs and charge transfer. The optimized sample of 2 wt% CdSe/Se/BiOBr produced 142.15 mg·L−1 rate of H2O2, which was much higher than that produced by pure BiOBr (89.4 mg·L−1) or CdSe/Se (10.9 mg·L−1). Additionally, almost 100 % of CIP was degraded within 30 min, with a first order rate constant of nearly 5.35 times that of pure BiOBr and 81.44 times that of pure CdSe/Se. The excellent removal efficiency of CIP from natural water matrices confirmed that the composites are promising for the removal of contaminants from natural waterways. Based on trapping experiments, electron spin resonance spectra (ESR) spectroscopy, and density functional theory (DFT) calculations, the photocatalytic mechanisms of H2O2 and CIP degradation by the Z-scheme CdSe/Se/BiOBr composites were proposed. Overall, the dual-functional CdSe/Se/BiOBr composite could potentially be applied for photocatalytic production of H2O2 and treatment of organic pollutants in water. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect