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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 reactions, at the same time, slow electron transfer and fast carrier recombination efficiency also hinder its development process

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
Comparison scheme
Effect test

Embodiment 1

[0026] Copper 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (14.8 mg, 0.02 mmol) and thieno[3,2-b]thiophene-2,5-dicarbaldehyde (8 mg, 0.04 mmol ) into a Pyrex tube (about 5 mL in volume, 20 cm in length, and 1 cm in diameter), add 0.925 mL of benzyl alcohol and 0.077 mL of n-butanol and sonicate for 1 minute to disperse evenly, then add 0.2 mL of 6 M acetic acid . The Pyrex tube was then frozen and thawed in liquid nitrogen, evacuated three times to bring its internal pressure to 0 mbar and flame-tight. Then the Pyrex tube was placed in an oven at 120 °C for 7 days. Wash three times with tetrahydrofuran and acetone, collect the product by suction filtration, and dry the collected purple powder in vacuum at 70° C. overnight.

[0027] Weigh 20 mg of TTD-COF-Cu, add it into a beaker filled with 20 mL of absolute ethanol, and continue to slowly add 43 μL of titanium tetra-n-butoxide and 0.5 mL of water into the beaker successively, while stirring continuously. Then the mixed solu...

Embodiment 2

[0029] Weigh 10 mg TiO 2 / TTD-COF-Cu, add 500mg sodium ascorbate and 3wt% Pt, add 50mL water, put it into a special quartz glass reactor after ultrasonication for 5 minutes. After the reactor was evacuated, a 300 W xenon lamp was used to simulate visible light (λ ≥ 420 nm) at 303–323 K. During the photocatalytic reaction, the gas composition after the photocatalytic reaction was detected by gas chromatography at intervals of 1 hour, as shown in Figure 6 As shown, pure TiO 2 The yield is 303 (μmol / g) / h, pure TTD-COF-Cu and the material after physically mixing the two in the same proportion have no catalytic activity, but the composite material TiO 2 H of / TTD-COF-Cu 2 The yield can reach 656.5 (μmol / g) / h. Therefore, it can be explained that the composite material in the present invention can effectively improve the 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
CPCB01J31/1691B01J21/063B01J37/10C01B3/042B01J2531/16B01J2531/025B01J35/39Y02E60/36
Inventor 李留义刘宇航潘鸿吉于岩
Owner FUZHOU UNIVERSITY
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