Eosin based metal-organic framework for hydrogen production driven by visible light and preparation method thereof

An organic framework and visible light technology, applied in the field of photocatalytic materials, can solve the problems of low visible light utilization rate, high price, toxicity, etc., and achieve the effect of excellent luminescence stability, low price and low cost

Active Publication Date: 2018-11-27
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Most metal-organic dyes based on Ru, Pt and Ir complexes are expensive, toxic, and poorly recyclable;
[0005] 2. Traditional MOFs as photocatalysts generally have low visible light utilization efficiency, high cost and low activity, and photocatalytically active MOFs in the visible light spectral region are still relatively few

Method used

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  • Eosin based metal-organic framework for hydrogen production driven by visible light and preparation method thereof
  • Eosin based metal-organic framework for hydrogen production driven by visible light and preparation method thereof
  • Eosin based metal-organic framework for hydrogen production driven by visible light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 18.7mg of eosin, 4.2mg of 4,4'-bipyridine and 10.8mg of Cd(NO 3 ) 2 4H 2 0, be placed in the glass sample vial of 10mL, add the mixed solvent of 5mL water and methanol (volume ratio is 1:1), then glass sample vial is placed in hydrothermal synthesis reactor, then hydrothermal synthesis reactor is placed In an electric blast drying oven at a constant temperature of 80°C, react for 24 hours. After the reaction, cool to obtain red blocky crystals, filter, wash, and dry at 100°C for 5 hours to obtain a metal-organic framework. Its crystal structure is as figure 1 It can be seen from the figure that the eosin unit is evenly distributed and has a large pore channel, which lays the foundation for the research on its photo-splitting water hydrogen production performance.

[0037] Stability testing of materials

[0038] Weigh 2 parts of the material Cd-EY in Example 1, add them to the aqueous solutions with pH values ​​of 5.6 and 10.5 respectively, stir for 24 hours, f...

Embodiment 2

[0046] Weigh 18.7mg of eosin, 4.2mg of 4,4'-bipyridine and 12.5mg of Cd(NO 3 ) 2 4H 2 0, be placed in the glass sample vial of 10mL, add the mixed solvent of 7mL water and methanol (volume ratio is 1:1), then glass sample vial is placed in the hydrothermal synthesis reactor, then the hydrothermal synthesis reactor is placed In an electric blast drying oven at a constant temperature of 75°C, react for 24 hours. After the reaction, cool to obtain red blocky crystals, filter, wash, and dry at 90°C for 6 hours to obtain a metal-organic framework.

Embodiment 3

[0048] Weigh 22.4mg of eosin, 4.2mg of 4,4'-bipyridine and 10.8mg of Cd(NO 3 ) 2 4H 2 0, be placed in the glass sample vial of 10mL, add the mixed solvent of 10mL water and methanol (volume ratio is 1:1), then glass sample vial is placed in hydrothermal synthesis reactor, then hydrothermal synthesis reactor is placed In an electric blast drying oven at a constant temperature of 75°C, react for 26 hours. After the reaction, cool to obtain red blocky crystals, filter, wash, and dry at 100°C for 6 hours to obtain a metal-organic framework.

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Abstract

The invention discloses an eosin based metal-organic framework for hydrogen production driven by visible light and a preparation method thereof. The metal-organic framework is prepared by a hydrothermal reaction with a soluble salt of cadmium by taking eosin as a main ligand and 4,4'-bipyridine as an auxiliary ligand. The chemical formula of the metal-organic framework is [Mm(L1)n(L2)b(H2O).(H2O)q], wherein, the L1 is the eosin, the L2 is the 4,4'-bipyridine, the M is a metal ion Cd<2+>, m=1, n=1, b=0.5, and q=4. The metal-organic framework provided by the invention has excellent luminescent stability, high chemical resistance and high catalytic performance, and can be used for visible light-driven photolysis of water to produce hydrogen. The preparation process is simple, environmentallyfriendly, low in cost, and easy in large-scale preparation.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and relates to a metal-organic framework material for visible light catalysis, in particular to a metal-organic framework material based on eosin-based visible light-driven hydrogen production and a preparation method thereof. Background technique [0002] Hydrogen is a sustainable and clean energy that can replace fossil fuels. Hydrogen production by photolysis of water is considered as a feasible hydrogen production technology, aiming to convert the earth's abundant solar energy into chemical fuel energy. However, most photocatalysts react under ultraviolet irradiation, which accounts for only 3%-5% of the solar spectrum. Therefore, efficient photocatalysts should be developed to maximize the utilization of visible light. [0003] However, designing and synthesizing photocatalytic materials with high light utilization efficiency for hydrogen production is a very challenging subject. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C09K11/06B01J31/22
CPCB01J31/1691B01J35/004B01J2531/27C08G83/008C09K11/06C09K2211/188
Inventor 武鹏彦刘艳红张凤杰邓超凡王健
Owner XUZHOU NORMAL UNIVERSITY
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