Dataset Information

Black TiO₂ nanobelts/g-C₃N₄ nanosheets Laminated Heterojunctions with Efficient Visible-Light-Driven Photocatalytic Performance.

ABSTRACT: Black TiO₂ nanobelts/g-C₃N₄ nanosheets laminated heterojunctions (b-TiO₂/g-C₃N₄) as visible-light-driven photocatalysts are fabricated through a simple hydrothermal-calcination process and an in-situ solid-state chemical reduction approach, followed by the mild thermal treatment (350?°C) in argon atmosphere. The prepared samples are evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N₂ adsorption, and UV-visible diffuse reflectance spectroscopy, respectively. The results show that special laminated heterojunctions are formed between black TiO₂ nanobelts and g-C₃N₄ nanosheets, which favor the separation of photogenerated electron-hole pairs. Furthermore, the presence of Ti³⁺ and g-C₃N₄ greatly enhance the absorption of visible light. The resultant b-TiO₂/g-C₃N₄ materials exhibit higher photocatalytic activity than that of g-C₃N₄, TiO₂, b-TiO₂ and TiO₂/g-C₃N₄ for degradation of methyl orange (95%) and hydrogen evolution (555.8??mol h^-1?g^-1) under visible light irradiation. The apparent reaction rate constant (k) of b-TiO₂/g-C₃N₄ is ~9 times higher than that of pristine TiO₂. Therefore, the high-efficient laminated heterojunction composites will have potential applications in fields of environment and energy.

SUBMITTER: Shen L

PROVIDER: S-EPMC5292731 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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Black TiO2 nanobelts/g-C3N4 nanosheets Laminated Heterojunctions with Efficient Visible-Light-Driven Photocatalytic Performance.

Shen Liyan L Xing Zipeng Z Zou Jinlong J Li Zhenzi Z Wu Xiaoyan X Zhang Yuchi Y Zhu Qi Q Yang Shilin S Zhou Wei W

Scientific reports 20170206

Black TiO2 nanobelts/g-C3N4 nanosheets laminated heterojunctions (b-TiO2/g-C3N4) as visible-light-driven photocatalysts are fabricated through a simple hydrothermal-calcination process and an in-situ solid-state chemical reduction approach, followed by the mild thermal treatment (350 °C) in argon atmosphere. The prepared samples are evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning elec ...[more]

PMID: 28165021

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Project description:Graphitic carbon nitride (g-C₃N₄) and titanium dioxide (TiO₂) were chosen as a model system to investigate photocatalytic abilities of heterojunction system under UV and visible light conditions. The use of g-C₃N₄ has been shown to be effective in the reduction in recombination through the interaction between the two interfaces of TiO₂ and g-C₃N₄. A simple method of preparing g-C₃N₄ through the pyrolysis of melamine was employed, which was then added to undoped TiO₂ material to form the g-C₃N₄-TiO₂ system. These materials were then fully characterized by X-ray diffraction (XRD), Brunauer Emmett Teller (BET), and various spectroscopic techniques including Raman, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), diffuse absorbance, and photoluminescence analysis. Photocatalysis studies were conducted using the model dye, rhodamine 6G utilizing visible and UV light irradiation. Raman spectroscopy confirmed that a composite of the materials was formed as opposed to a mixture of the two. Using XPS analysis, a shift in the nitrogen peak to that indicative of substitutional nitrogen was detected for all doped samples. This is then mirrored in the diffuse absorbance results, which show a clear decrease in band gap values for these samples, showing the effective band gap alteration achieved through this preparation process. When g-C₃N₄-TiO₂ samples were analyzed under visible light irradiation, no significant improvement was observed compared that of pure TiO₂. However, under UV light irradiation conditions, the photocatalytic ability of the doped samples exhibited an increased reactivity when compared to the undoped TiO₂ (0.130 min-1), with 4% g-C₃N₄-TiO₂ (0.187 min-1), showing a 43.9% increase in reactivity. Further doping to 8% g-C₃N₄-TiO₂ lead to a decrease in reactivity against rhodamine 6G. BET analysis determined that the surface area of the 4% and 8% g-C₃N₄-TiO₂ samples were very similar, with values of 29.4 and 28.5 m²/g, respectively, suggesting that the actual surface area is not a contributing factor. This could be due to an overloading of the system with covering of the active sites resulting in a lower reaction rate. XPS analysis showed that surface hydroxyl radicals and oxygen vacancies are not being formed throughout this preparation. Therefore, it can be suggested that the increased photocatalytic reaction rates are due to successful interfacial interactions with the g-C₃N₄-doped TiO₂ systems.

Dataset Information

Black TiO₂ nanobelts/g-C₃N₄ nanosheets Laminated Heterojunctions with Efficient Visible-Light-Driven Photocatalytic Performance.

Publications

Black TiO<sub>2</sub> nanobelts/g-C<sub>3</sub>N<sub>4</sub> nanosheets Laminated Heterojunctions with Efficient Visible-Light-Driven Photocatalytic Performance.

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