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Metal organic frameworks (MOFs) material capable of photocatalyzing water cracking and preparation method thereof

A metal-organic framework, photocatalytic technology, applied in chemical instruments and methods, non-metallic elements, physical/chemical process catalysts, etc., can solve the problem of no discovery, and achieve the effect of simple method, universal applicability, and mild reaction conditions

Inactive Publication Date: 2017-06-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned MOFs are limited to the half-reaction of photocatalytic water splitting to produce hydrogen or oxygen. So far, no reports have been found on the use of MOFs for photocatalytic water splitting to simultaneously generate stoichiometric ratios of hydrogen and oxygen.

Method used

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  • Metal organic frameworks (MOFs) material capable of photocatalyzing water cracking and preparation method thereof
  • Metal organic frameworks (MOFs) material capable of photocatalyzing water cracking and preparation method thereof
  • Metal organic frameworks (MOFs) material capable of photocatalyzing water cracking and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Preparation of Al-ATA with photocatalytic oxygen production activity

[0039] Dissolve 1.05mmol of aluminum nitrate in 20mL of N,N-dimethylformamide, then add 1.56mmol of 2-aminoterephthalic acid, stir thoroughly for 30 minutes, and transfer to a 100mL polytetrafluoroethylene reactor. Put the reactor into an oven at 110°C for 48 hours. Naturally cooled at room temperature, the reaction product was suction-filtered, the sample was washed three times with N,N-dimethylformamide and absolute ethanol, and dried at 60°C for 12 hours. The obtained light yellow powder was Al-ATA.

Embodiment 2

[0040] Embodiment 2: the preparation of Al-ATA-Ni

[0041] Disperse 100 mg of Al-ATA prepared in Example 1 in 100 mL of water, add 0.02 mmol of nickel nitrate, stir at room temperature for 96 hours, and fully wash the physically adsorbed Ni on the surface with water. 2+ , dried at room temperature, that is.

[0042] Carry out structural characterization to the product prepared in this embodiment, such as Figure 1-Figure 3 shown. in, figure 1 It is the X-ray diffraction figure of the product obtained in this embodiment 2, as can be seen from the figure, amino complex Ni in Al-ATA 2+ After that, the XRD of the material did not change significantly, indicating that the Ni 2+ The complexation did not destroy the crystal structure of the material Al-ATA. figure 2 It is the EXAFS figure of the product obtained in this embodiment, figure 2 The figure a in the middle shows that the coordination mode of Ni in Al-ATA-Ni is the same as that of nickel nitrate and NiO, and they ar...

Embodiment 3

[0043] Example 3: Activity test of Al-ATA-Ni photocatalytic splitting water

[0044] The experiment was carried out in a sealed glass system, and the side illuminated by the light source was quartz glass to ensure sufficient passage of ultraviolet light. The light source is a 300W xenon lamp. The reaction system is connected to a gas chromatograph to ensure in-situ online detection of hydrogen and oxygen generated in the system. Photocatalyst Al-ATA-Ni 30mg, deionized water 30mL. After the reaction system is sealed, first vacuumize for half an hour to remove the gas dissolved in the system, photocatalyst adsorption and solvent.

[0045] Figure 4 It is the rate diagram of the photocatalytic water splitting of the product made in this embodiment. It can be seen from the figure that the production rate ratio of hydrogen and oxygen is 2:1. It shows that the generated hydrogen and oxygen do come from the photocatalytic cracking of water.

[0046] In summary, the present inve...

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Abstract

The invention discloses a preparation method of a metal organic frameworks (MOFs) material capable of photocatalyzing water cracking and an MOFs material prepared by the method. The technical scheme is as follows: the method comprises the following steps: dispersing amino-containing MOFs in an organic ligand into a solvent, adding a transition metal soluble salt, stirring uniformly, reacting for 90-100 hours, filtering, washing, and drying. Since the amino group contained in the organic ligand in the MOF material can be easily coordinated with metal ions, the transition metal ions with catalytic activity are introduced into the MOFs system in a monatomic dispersion mode, thereby implementing photocatalytic water cracking to simultaneously generate hydrogen and oxygen under the condition of no sacrifice agent. The preparation method is simple, has the advantages of wide reaction raw material sources and operable experimental steps, has universality and potential design study prospects, and can implement mass production.

Description

technical field [0001] The invention relates to the technical field of preparation of metal organic framework materials, in particular to a metal organic framework material capable of photocatalytically splitting water and a preparation method thereof. Background technique [0002] Hydrogen is a carbon-free, green and clean energy. In recent years, with the increasingly serious problems of energy shortage and environmental pollution, photocatalytic water splitting for hydrogen production has attracted more and more attention. But so far, most of the researches mainly focus on the half-reaction of photolysis of water to produce hydrogen or oxygen in the presence of a sacrificial agent. And most photocatalysts are composites. In general, cocatalysts are widely used in the field of photolysis of water because they can reduce the overpotential of the photocatalytic reaction and promote the separation of charge carriers during the reaction. [0003] Metal-organic frameworks (M...

Claims

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Application Information

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IPC IPC(8): B01J31/22C08G83/00C01B3/04
CPCC01B3/042C08G83/008B01J31/1691B01J31/2243B01J2531/0213B01J2531/0219B01J2531/31B01J2531/847B01J35/39Y02E60/36
Inventor 刘媛媛安阳黄柏标张晓阳秦晓燕
Owner SHANDONG UNIV
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