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Preparation and Photocatalytic Properties of N-Doped Graphene/TiO2Composites
- Source :
- Journal of Chemistry, Vol 2020 (2020)
- Publication Year :
- 2020
- Publisher :
- Hindawi Limited, 2020.
-
Abstract
- N-doped graphene (NG)/TiO2composites were prepared by a two-step hydrothermal method using HF as the surface etchant and urea as the nitrogen source. The morphology, structure, and bonding conditions of the NG/TiO2composites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), and photoluminescence (PL) spectroscopy. The effects of NG on the lifetime of photogenerated electron-hole pairs, adsorption capacity, and photocatalytic activity of the composite photocatalysts were also investigated. The photocatalytic activity was evaluated under ultraviolet light and sunlight irradiation. The recovery testing was completed under ultraviolet light irradiation. The results show that TiO2was uniformly loaded on the NG surface by chemical bonding. The introduction of NG effectively inhibited the recombination of photogenerated electron-hole pairs and improved both the adsorption capacity and photocatalytic activity of the composites. The 7 wt % NG/TiO2showed the best adsorption capacity of methyl orange (MO). The best photocatalytic activity occurred for 5 wt % NG/TiO2composites, and after four recovery tests, the photocatalytic degradation of MO under 60 min ultraviolet light irradiation exceeded 90%.
- Subjects :
- Article Subject
Diffuse reflectance infrared fourier transform
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Chemistry
chemistry.chemical_compound
symbols.namesake
Adsorption
X-ray photoelectron spectroscopy
chemistry
Ultraviolet light
Methyl orange
Photocatalysis
symbols
Composite material
0210 nano-technology
Spectroscopy
Raman spectroscopy
QD1-999
Subjects
Details
- ISSN :
- 20909071 and 20909063
- Volume :
- 2020
- Database :
- OpenAIRE
- Journal :
- Journal of Chemistry
- Accession number :
- edsair.doi.dedup.....160850325be420f60ffc0f26ed293410