A titanium dioxide porphyrin-based covalent organic framework composite material and its preparation method and application

A technology of covalent organic framework and titanium dioxide, applied in chemical instruments and methods, catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, etc., can solve slow electron transfer, limited application, carrier recombination Efficiency barriers and other issues, to achieve the effect of strong electron feeding ability, improved utilization rate, and high industrial application value

Active Publication Date: 2021-12-28
FUZHOU UNIV
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  • 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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  • A titanium dioxide porphyrin-based covalent organic framework composite material and its preparation method and application
  • A titanium dioxide porphyrin-based covalent organic framework composite material and its preparation method and application
  • A titanium dioxide porphyrin-based covalent organic framework composite material and its preparation method and application

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

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 the synthesis of a titanium dioxide porphyrin-based covalent organic framework composite material and its application in photocatalytic decomposition of water to produce hydrogen. It is helpful in alleviating the energy crisis and developing sustainable clean energy as a substitute for fossil fuels. TiO 2 As a photocatalyst, it has the characteristics of non-toxicity, low price and easy availability, suitable oxidation-reduction potential, high photocorrosion resistance, and excellent chemical stability. Covalent organic framework materials are a class of structurally diverse porous materials linked by covalent bonds with high specific surface area, high porosity, and high crystallinity, and have the characteristics of designability and easy functionalization. The present invention uses the post-modification strategy to convert the inorganic semiconductor TiO 2 Combining with COFs with large π-conjugated systems and excellent chemical stability to form composite catalysts for photocatalytic water splitting reactions is of innovative significance. It 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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Patent Type & Authority Patents(China)
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 UNIV
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