One-step hydrothermal synthesis of N/Ti3+ co-doping multiphasic TiO2/BiOBr heterojunctions towards enhanced sonocatalytic performance
| Autor: | Xiaojiao Yuan, Mingxuan Sun, Xiaojing Lin, Yuan Yao, Yuanhua Zhu, Sambandam Anandan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Materials science Acoustics and Ultrasonics Diffuse reflectance infrared fourier transform Scanning electron microscope Organic Chemistry Doping 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Rhodamine B Chemical Engineering (miscellaneous) Environmental Chemistry Hydrothermal synthesis Radiology Nuclear Medicine and imaging 0210 nano-technology Methylene blue |
| Zdroj: | Ultrasonics Sonochemistry. 49:69-78 |
| ISSN: | 1350-4177 |
| DOI: | 10.1016/j.ultsonch.2018.07.025 |
| Popis: | N/Ti3+ co-doping multiphasic TiO2/BiOBr heterojunctions (NT-TBx) were prepared by one-step in situ hydrothermal processes. The crystal phase, morphology, component, and optical properties of the heterojunctions were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, and Ultraviolet–visible diffuse reflectance spectroscopy techniques, respectively. The as-prepared samples exhibit better sonocatalytic activity for the degradation methylene blue, Rhodamine B, and p-Nitrophenol aqueous solution compared with pristine TiO2 and N/Ti3+ co-doping multiphasic TiO2. Especially, the highest degradation ratio of methylene blue was achieved for NT-TB0.3 up to 98.2% after 50 min under ultrasonic irradiation. The high sonocatalytic activity has been kept after four cycles with the tiny decline, indicating the excellent stability of the as-prepared samples. The improvement of sonocatalytic activity could be attributed to the formation of doping level and multiphasic TiO2/BiOBr heterojunctions, which account for the absorption of long wavelength light and the electron-hole pair separation, respectively. Furthermore, superoxide radical ( O2−) was demonstrated to be the main reactive species for the degradation of methylene blue under ultrasonic irradiation. This study provides a facile fabrication procedure for N/Ti3+ co-doping multiphasic TiO2/BiOBr heterojunctions and demonstrates an efficient route to promote the application of TiO2 in addressing environment-related issues. |
| Databáze: | OpenAIRE |
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