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Method of efficiently degrading water-produced hydrogen based on conjugated porous organic photocatalyst

A photocatalyst and water splitting technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low hydrogen production performance and uncertain hydrogen source. Methanol, unable to promote the separation of photogenerated electrons and holes, etc., to achieve the effect of promoting separation, improving hydrogen production performance, and promoting effective dispersion

Active Publication Date: 2019-09-27
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The commonly used co-solvent in the existing photolysis water process is methanol, but because the active protons of methanol itself are very easy to separate, the source of the produced hydrogen cannot be determined whether it comes from methanol or water, which reduces the production of organic semiconductor cracking water to a certain extent. Hydrogen Accuracy
In addition, in the photocatalytic hydrogen production experiment, a sacrificial agent is usually added to consume the holes generated by the catalyst excited by light, thereby promoting the hydrogen production performance. Although methanol can improve the dispersion of organic photocatalysts in water, it cannot promote the photogenerated electron holes. The separation of hole pairs, thus also leads to the low photocatalytic hydrogen production performance of the conjugated organic porous polymer organic photocatalyst in the methanol system

Method used

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  • Method of efficiently degrading water-produced hydrogen based on conjugated porous organic photocatalyst
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  • Method of efficiently degrading water-produced hydrogen based on conjugated porous organic photocatalyst

Examples

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Effect test

preparation example 1

[0037] Preparation Example 1 Preparation of Conjugated Porous Organic Photocatalyst P1

[0038] In a 25mL Schlenk tube, add 1,3,6,8-tetrabromopyrene (0.386mmol, 200.0mg), 5,5′-bis(trimethyltinyl)-2,2′-bithiophene (0.772mmol , 379.9mg), P(o-MeOPh) 3 (0.039mmol, 10.9mg), Pd 2 dba 3 (0.015mmol, 14.1mg) and 10ml of a mixture of toluene / DMF (19:1, v / v). The mixture was degassed under the thawing of the refrigeration pump, purged with argon, stirred at 110°C for 48h, cooled to room temperature and poured into CH 2 Cl 2 , and filtered to obtain the crude product. The resulting crude product was extracted and separated, and CH was added successively. 2 Cl 2 , methanol, NaF solution, water and methanol to purify, remove inorganic salts, unreacted raw materials and other impurities in the reactant, and vacuum-dry the resulting solid product to obtain a conjugated porous organic semiconductor material, denoted as P1.

preparation example 2

[0039] Preparation Example 2 Preparation of Conjugated Porous Organic Photocatalyst P2

[0040] In a 25 mL Schlenk tube, add 2,2′,7,7′-tetrabromospirofluorene (0.386 mmol, 243.9 mg), 5,5′-bis(trimethyltinyl)-2,2′-bithiophene (0.772 mmol, 379.9 mg), P(o-MeOPh)3 (0.039 mmol, 10.9 mg), Pd2dba3 (0.015 mmol, 14.1 mg) and 10 ml of a mixture of toluene / DMF (19:1, v / v). The mixture was degassed under the thawing of the refrigeration pump, purged with argon, stirred at 110°C for 48h, cooled to room temperature and poured into CH 2 Cl 2 , and filtered to obtain the crude product. The resulting crude product was extracted and separated, and CH was added successively. 2 Cl 2 , methanol, NaF solution, water and methanol to purify, remove inorganic salts, unreacted raw materials and other impurities in the reactant, and vacuum-dry the resulting solid product to obtain a conjugated porous organic semiconductor material, denoted as P2.

preparation example 3

[0041] Preparation Example 3 Preparation of Conjugated Porous Organic Photocatalyst P3

[0042] In a 25mL Schlenk tube, add 1,3,5-tribromobenzene (0.515mmol, 162.0mg), 5,5′-bis(trimethyltinyl)-2,2′-bithiophene (0.772mmol, 379.9 mg), a mixture of P(o-MeOPh)3 (0.039mmol, 10.9mg), Pd2dba3 (0.015mmol, 14.1mg) and 10ml of toluene / DMF (19:1, v / v). The mixture was degassed under the thawing of the refrigeration pump, purged with argon, stirred at 110°C for 48h, cooled to room temperature and poured into CH 2 Cl 2 , and filtered to obtain the crude product. The resulting crude product was extracted and separated, and CH was added successively. 2 Cl 2 , methanol, NaF solution, water and methanol purification to remove inorganic salts, unreacted raw materials and other impurities in the reactant, vacuum-dry the resulting solid product to obtain a conjugated porous organic semiconductor material, denoted as P3.

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Abstract

The invention belongs to the technical field of photocatalytically degrading water-produced hydrogen, and in particular relates to a method of efficiently degrading water-produced hydrogen based on a conjugated porous organic photocatalyst. Aprotic polar solvents such as DMSO, MMF, DMI, DMF, DMAc and NMP are introduced into a photocatalytic system as a solubilizer. With the presence of the conjugated porous organic photocatalyst, water is subjected to photocatalyzation and degraded to prepare hydrogen. Compared with a traditional methanol cosolvent hydrogen-producing system, hydrogen-producing performance of the conjugated porous organic photocatalyst is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic decomposition of water to produce hydrogen, and specifically relates to a method for efficiently decomposing water to produce hydrogen based on a conjugated porous organic photocatalyst. The method introduces DMSO, MMF, DMI, DMF, DMAc into the photocatalytic system and NMP and other aprotic polar solvents, which significantly improved the hydrogen production performance of conjugated organic photocatalysts. Background technique [0002] In recent years, with the continuous growth of global energy demand, research on finding new energy sources has attracted more and more attention. As a new secondary energy source, hydrogen energy has many advantages such as cleanness, high efficiency, safety, storability, and transportability. It has been generally considered to be the most ideal pollution-free green energy in the new century, so it has been highly valued by various countries. . [0003] ...

Claims

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Application Information

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IPC IPC(8): B01J31/06C01B3/04
CPCB01J31/06C01B3/042C01B2203/0277B01J35/39Y02E60/36
Inventor 刘诗咏
Owner JIANGXI UNIV OF SCI & TECH
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