Extracellular biosynthesis of Cu2-xSe nanocrystallites with photocatalytic activity
| Autor: | Shiyue Qi, Jia Wang, Xinrui Liang, Shuhui Yang, Baoping Xin, Lei Yue |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Mechanical Engineering
Energy-dispersive X-ray spectroscopy Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Fluorescence spectroscopy 0104 chemical sciences chemistry.chemical_compound Crystallinity chemistry X-ray photoelectron spectroscopy Mechanics of Materials Photocatalysis General Materials Science 0210 nano-technology Spectroscopy Methylene blue Nuclear chemistry |
| Zdroj: | Materials Research Bulletin. 111:126-132 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2018.11.014 |
| Popis: | Semiconductor Cu2-xSe nanospheres were successfully biosynthesized based on bioreduction of SeO32− into Se2- by the selenite-reducing bacterium, Pantoea agglomerans. The Cu2-xSe nanospheres had excellent crystallinity with a face-centered cubic structure and an average diameter of 80 nm. Composition and oxidation states analysis using X-ray photoelectron spectroscopy and X-ray energy dispersive spectroscopy followed by optical characterization using ultraviolet-visible and Fourier transform infra-red spectroscopy confirmed that the biosynthesized Cu2-xSe nanospheres were capped by proteins. The extracellular proteins which mediated biosynthesis were visualized by excitation–emission matrix fluorescence spectroscopy. Sodium dodecyl sulfate-polyacrylamide gel electrophoretic analysis revealed that the molecular masses of proteins were about 110, 50, 38, 35 and 25 kDa. The biosynthesized Cu2−xSe nanospheres showed an excellent and stable photocatalytical activity under sunlight irradiation in the degradation of methylene blue for four cycles. This study put forward a green and toilless way to manufacture copper selenide nanoparticles using a biological process. |
| Databáze: | OpenAIRE |
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