Preparation method and application of a hydrogel material for visible light photolysis of water to produce hydrogen

A technology of photo-splitting water for hydrogen production and hydrogel, which is applied in the field of photocatalysis and can solve the problem of low hydrogen production efficiency and so on.

Active Publication Date: 2021-07-30
峰特(浙江)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Hydrogen production by photolysis of water has the advantages of energy saving, cleanliness, and no pollution. Since photocatalytic water decomposition includes various physical and chemical processes such as photoelectric conversion, charge separation and migration, it is difficult for a single catalyst to independently meet the requirements of each process, resulting in Hydrogen production efficiency is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a hydrogel material for visible light photolysis of water to produce hydrogen is as follows:

[0021] Step 1: Preparation of photosensitizer: add 36.0g (100mmol) of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline and 63.7g (600mmol) of Benzaldehyde, add 3.5L acetic anhydride as a solvent, heat to reflux, react for 10 hours, cool to room temperature, drop the reaction solution into deionized water, precipitate solid, filter to obtain a filter cake, recrystallize and filter with dichloromethane The cake obtained 45.6 g of the photosensitizer 2,9-distyryl-4,7-diphenyl-1,10-phenanthroline, with a yield of 85%.

[0022] Step 2: Preparation of the catalyst: under nitrogen protection, add 25.0g 2,9-distyryl-4,7-diphenyl-1,10-phenanthroline and 27.0g Xantphos to the round bottom flask, and use 250mL After tetrahydrofuran was dissolved, 2.4 g of cobalt chloride was added, and after stirring, the color changed from blue to pink, ligands were formed in situ,...

Embodiment 2

[0026] Compared with Example 1, Example 2 is different in that Step 4 is different in Example 2: In the reactor, 23g N-hydroxyethyl-3,3-dimethylindoline spiropyran-methacrylic acid Esters, 17.2g of N-isopropylacrylamide and 18.4g of methyl acrylate were mixed in 150mL of pure water, and at low temperature, 5.9g of cumene peroxide and 5.9g of tetramethylethylenediamine were added, and polymerized for 2 hours , then add 4.1 g of the catalyst prepared in step 2, stir for 30 min, heat up to room temperature and stir for 2 hours to obtain a hydrogel material.

Embodiment 3

[0028] Compared with Example 1, Example 3 is different in that Step 4 is different in Example 3: In the reactor, 23g N-hydroxyethyl-3,3-dimethylindoline spiropyran-methacrylic acid Mix ester, 20.7g N-isopropylacrylamide and 21.0g methyl acrylate in 150mL pure water, add 6.5g cumene peroxide and 6.5g tetramethylethylenediamine at low temperature, polymerize for 2 hours , and then add 6.5 g of the catalyst prepared in step 2, stir for 30 min, heat up to room temperature and stir for 2 hours to obtain a hydrogel material.

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Abstract

A hydrogel material for visible light photolysis of water to produce hydrogen, prepared by the following method: step 1: preparation of a photosensitizer; step 2: preparation of a catalyst; step 3: preparation of an optical drive compound; step 4: preparation of a gel material preparation. The present invention uses cobalt complexes of phenanthroline derivatives loaded on hydrogels as visible light photolysis water hydrogen production materials, and N-hydroxyethyl-3,3-dimethylindoline, one of the raw materials for preparing hydrogels Spiropyran-methacrylate has a photo-swelling effect. When it is exposed to light, its volume expands, making the pores of the hydrogel larger, which is conducive to the contact between water and the catalyst, and is more conducive to the photosensitizer loaded to receive light. It can make it transition from the ground state to the excited state after absorbing light energy, and it is easier to capture electrons from the electron sacrificial agent and transfer them to the hydrogen production catalyst. The photosensitizer returns to the ground state, and the hydrogen production catalyst converts the hydrogen protons in the water into hydrogen gas.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a preparation method and application of a hydrogel material for hydrogen production by photolysis of water with visible light. Background technique [0002] With the deterioration of energy consumption and environmental pollution, the development of new clean energy is an important way to deal with this crisis. Due to its abundant reserves, good combustion performance, light weight, and no pollution, hydrogen energy has become an efficient and clean energy that is most likely to replace fossil fuels. Hydrogen energy has broad application prospects in the fields of environmentally friendly vehicles, home heating, and hydrogen power generation. [0003] Hydrogen has good characteristics and is expected to become a substitute for fossil fuels: 1) High combustion value. If 0.1kg of hydrogen is completely burned, it can release 1.43×10 7 J energy, which can heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/24B01J31/22C01B3/04
CPCB01J31/183B01J31/2452B01J35/0013B01J2531/845C01B3/042C01B2203/0277C01B2203/1052Y02E60/36
Inventor 严文忠
Owner 峰特(浙江)新材料有限公司
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