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TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst and preparation method thereof

A technology of graphite phase carbon nitride and compound light, which is applied in the field of photocatalysis, can solve the problems of unstable photocatalytic reaction, and achieve the effects of simple preparation process, improved chemical stability and low price

Inactive Publication Date: 2012-04-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when Domen and Wong et al. further studied graphitic carbon nitride in the visible light splitting of water to generate oxygen (Domen, J. Phys. Chem. C, 2009, 113: 4940-4947), they found that the catalyst was in the photogenerated hole Under the action, part of itself decomposes to generate N 2 , resulting in an unstable photocatalytic reaction

Method used

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  • TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst and preparation method thereof
  • TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst and preparation method thereof
  • TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst and preparation method thereof

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Embodiment 1

[0034] Add 0.56g melamine to 70mlTiO 2 The sol was stirred and dissolved, ultrasonicated for 10 minutes, then placed in a 100°C hydrothermal reaction vessel, kept at 180°C for 6h, then cooled to room temperature naturally, centrifuged and washed with distilled water for 5 times, vacuum-dried at 80°C for 12h, and then heat-treated at 550°C 4h, TiO is produced 2 Graphite phase carbon nitride heterojunction composite photocatalyst. X-ray diffraction tests showed that, if Figure 4 Shown: TiO 2 The crystal form is anatase. According to Scherrer's formula, the crystal grain is about 5nm, and the carbon nitride is graphite phase. High-resolution transmission electron microscopy results showed that Image 6 Shown: The catalyst is a core-shell structure, and the core is TiO 2 Nanoparticles, the particle size is about 5nm, the shell is carbon nitride, and the thickness is about 2nm.

Embodiment 2

[0036] Add 0.56g melamine to 70mlTiO 2 The sol was stirred and dissolved, ultrasonicated for 10 minutes, then put into a 100°C hydrothermal reaction vessel, kept at 200°C for 6h, then cooled to room temperature naturally, centrifuged and washed with distilled water for 5 times, vacuum-dried at 80°C for 12h, and then heat-treated at 550°C 4h, TiO is produced 2 Graphite phase carbon nitride heterojunction composite photocatalyst. X-ray diffraction tests showed that, if Figure 7 Shown: TiO 2The crystal form is anatase. According to Scherrer's formula, the crystal grain is about 6.2nm, and the carbon nitride is graphite phase. High-resolution transmission electron microscopy results showed that Figure 8 Shown: The catalyst is a core-shell structure, and the core is TiO 2 Nanoparticles, the particle size is about 6nm, the shell is carbon nitride, and the thickness is about 2nm. UV-Vis Diffuse Reflectance Spectroscopy ( Figure 9 ) shows that the composite photocatalyst has...

Embodiment 3

[0038] Add 0.84g melamine to 70ml TiO 2 The sol was stirred and dissolved, ultrasonicated for 10 minutes, then put into a 100°C hydrothermal reaction vessel, kept at 200°C for 6h, then cooled to room temperature naturally, centrifuged and washed with distilled water for 5 times, vacuum-dried at 80°C for 12h, and then heat-treated at 550°C 4h, TiO is produced 2 Graphite phase carbon nitride heterojunction composite photocatalyst. X-ray diffraction test shows that: TiO 2 The crystal form is anatase. According to Scherrer's formula, the crystal grain is about 5.2nm, and the carbon nitride is graphite phase. The results of high-resolution transmission electron microscopy show that the catalyst has a core-shell structure, and the core is TiO 2 Nanoparticles, the particle size is about 5nm, the shell is carbon nitride, and the thickness is about 2nm.

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Abstract

The invention discloses a TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst and a preparation method thereof. The catalyst has a structure of a core made of TiO2 nanoparticles and a shell made of a graphite phase carbon nitride layer. The preparation method comprises the following steps: a) preparing TiO2 nanoparticles coated by Melem by hydro-thermal reaction; and b), washing, separating, drying and calcining the TiO2 nanoparticles to obtain the TiO2@ graphite phase carbon nitride heterojunction composite photocatalyst. The invention has the advantages that: the method is simple, low in cost and suitable for large-scale industrial production; and the composite photocatalyst has high visible light response activity and stability and can be widely used in fields such as photocatalysis and photoelectric conversion.

Description

technical field [0001] The present invention relates to a kind of TiO 2 The invention discloses a graphite phase carbon nitride heterojunction composite photocatalyst and a preparation method thereof, belonging to the field of photocatalysis. Background technique [0002] With the continuous development of the global industrialization process, the problems of environmental pollution and energy shortage are becoming more and more serious, which have become severe challenges faced by the whole world. Solar energy is large, clean and non-polluting, inexhaustible, and it is not an ideal alternative energy recognized by the international community. Since Fujishima and Honda discovered single crystal TiO in 1972 2 Electrode photolysis of water and Carey et al successfully made TiO 2 Since it was used for photocatalytic degradation of organic pollutants in water, semiconductor photocatalytic technology has rapidly attracted the attention of researchers from all over the world be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24
Inventor 张平罗和安赵才贤龙丝曦易伟李花英罗琦伍彬尹文彪
Owner XIANGTAN UNIV
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