Platinum/zinc oxide nanoparticles: Enhanced photocatalysts degrade malachite green dye under visible light conditions
| Autor: | Mohammad W. Kadi, Wolfgang M. Sigmund, Reda M. Mohamed, David McKinney, I.A. Mkhalid |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Band gap Process Chemistry and Technology Nanoparticle chemistry.chemical_element 02 engineering and technology Zinc 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Materials Chemistry Ceramics and Composites Photocatalysis Malachite green 0210 nano-technology Platinum Visible spectrum Nuclear chemistry BET theory |
| Zdroj: | Ceramics International. 42:9375-9381 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2016.02.147 |
| Popis: | Zinc oxide nanoparticles (ZnO) were prepared via a sol–gel method, and a photo-assisted deposition method was used to prepare platinum on zinc oxide nanoparticles (Pt/ZnO). Several techniques were used to characterize these enhanced photocatalysts: XRD, TEM, UV–vis spectra, PL spectra, XPS, and BET surface area analysis. As-prepared samples’ photocatalytic performances were studied via degradation of malachite green dye under various visible-light-only irradiation scenarios. Results demonstrated the following: platinum (Pt) was well dispersed on and in ZnO's surfaces and pores; as such, Pt/ZnO had less surface area than pure ZnO due to pore blockage; however, advantages gained from enhanced electron-hole separation and decreased band gap width more than made up for this negative effect; moreover, Pt/ZnO prepared with 0.3 wt% Pt exhibited the lowest band gap and the highest photocatalytic activity of the various samples with a solids loading of 0.8 g/l; finally, such samples were recyclable, i.e., photocatalytic performance remained stable even after five uses. |
| Databáze: | OpenAIRE |
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