Titanium dioxide porphyrin-based covalent organic framework composite material as well as preparation method and application thereof

A technology of covalent organic framework and titanium dioxide, which is applied in chemical instruments and methods, catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, etc., can solve the problem of limited application, carrier recombination efficiency hindrance, slow Electron transfer and other issues, to achieve the effect of improving utilization rate, high industrial application value, and strong electron supply ability

Active Publication Date: 2021-06-25
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The wide bandgap (3.0~3.2eV), can only absorb ultraviolet light (λ2 The application of materials in photocatalytic

Method used

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  • Titanium dioxide porphyrin-based covalent organic framework composite material as well as preparation method and application thereof
  • Titanium dioxide porphyrin-based covalent organic framework composite material as well as preparation method and application thereof
  • Titanium dioxide porphyrin-based covalent organic framework composite material as well as preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0025] Example 1

[0026] 5,10,15,20- 4 (4-aminophenyl) porphyrin copper (14.8 mg, 0.02 mmol) and thiophene [3,2-b] thiophene-2,5-dimethyls (8 mg, 0.04 mmol) Placed in the Pyrex tube (by about 5 mL, length 20 cm, diameter 1 cm), add 0.925 ml of benzyl alcohol and 0.077 ml of n-butanol to dispersion uniform, then add 0.2 ml of 6 M acetic acid . Then, the PyRex tube was frozen in liquid nitrogen, vacuum three times, and the internal pressure was 0 Mbar and the flame seal was performed. Then, the PyRex tube was placed in an oven at 120 ° C for 7 days. Three times with tetrahydrofuran, acetone was washed three times, and the product was filtered, and the collected purple powder was dried overnight at 70 ° C.

[0027] It is weighed 20 mg TTD-Cu, adding 20 ml of anhydrous ethanol, and continued to slowly add 43 μl of tetra-niol titanium, 0.5 ml of water, and continuously stirred. The mixture was then transferred to 50 mL of polytetrafluoroethylene hydrothermal kettle to react in an oven...

Example Embodiment

[0028] Example 2

[0029] 10 mg Tio 2 / TTD-COF-CU was added 500 mg of sodium ascorbate and 3 wt% Pt, 50 ml of water, and it was put into special quartz glass reactor after 5 minutes. After the reactor evacuate, the visible light (λ ≥ 420 nm) was irradiated with 300 W xenon lamp in 303 to 323 k, during photocatalytic reaction, and the gas composition after gas chromatography was detected by gas chromatography, such as Figure 6 Down, pure TiO 2 The yield is 303 (μmol / g) / h, pure TTD-COF-Cu and the material after blending of the two, but the composite material TiO 2 / TTD-COF-CU h 2 The yield can reach 656.5 (μmol / g) / h. It is therefore possible to explain the composite material in the present invention effectively improve photocatalytic activity.

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Abstract

The invention discloses synthesis of a titanium dioxide porphyrin-based covalent organic framework composite material and application of the titanium dioxide porphyrin-based covalent organic framework composite material in hydrogen production by photocatalytic decomposition of water. The material has a certain benefits in the aspects of relieving energy crisis and developing sustainable clean energy as a substitute of fossil fuel. As a photocatalyst, TiO2 has the characteristics of no toxicity, low price, easiness in obtaining, proper oxidation-reduction potential, high light corrosion resistance, excellent chemical stability and the like. The covalent organic framework material is made of structurally diversified porous materials which are connected by covalent bonds and have high specific surface area, high porosity and high crystallinity, and has the characteristics of designability and easiness in functionalization. An inorganic semiconductor TiO2 and COFs with a large pi conjugated system and excellent chemical stability are combined by utilizing a post-modification strategy to form a composite catalyst, and the composite catalyst is applied to a photocatalytic water decomposition reaction and has innovative significance; and the material has great research and application potential in the field of photocatalysis.

Description

technical field [0001] The invention belongs to the field of material preparation, and specifically proposes a titanium dioxide porphyrin-based covalent organic framework composite material for photocatalytic decomposition of water to produce hydrogen. Background technique [0002] With the rapid development of industry and the improvement of people's living standards, the energy demand and environmental pollution faced by human beings are becoming more and more severe. Therefore, the development of sustainable clean energy as a substitute for fossil fuels is a new challenge for human beings. Among various renewable energy sources, hydrogen energy is considered as a substitute for fossil energy due to its advantages of environmental protection and high energy density, and photocatalytic water splitting reaction is considered to be one of the best ways to obtain hydrogen energy. Therefore, research on photocatalysts that can effectively split water by collecting inexhaustible...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J21/06B01J37/10C01B3/04
CPCB01J31/1691B01J21/063B01J35/004B01J37/10C01B3/042B01J2531/16B01J2531/025Y02E60/36
Inventor 李留义刘宇航潘鸿吉于岩
Owner FUZHOU UNIVERSITY
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