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A kind of preparation method of graphene oxide/porphyrin composite photocatalyst

A technology of photocatalyst and porphyrin compound, which is applied in the field of photocatalysis, can solve the problems of high price of silver, limit product promotion and application, accelerate the separation of photogenerated electron pairs, achieve low cost, inhibit electron-hole recombination, and promote rapid transfer Effect

Inactive Publication Date: 2017-12-26
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Utilizing the high electrical conductivity of silver can accelerate the separation of photogenerated electron pairs, prolong the life of active components, and improve the catalytic activity of composite photocatalytic materials, but the price of silver used is relatively expensive, which limits the popularization and application of products.

Method used

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  • A kind of preparation method of graphene oxide/porphyrin composite photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 8 g of graphene oxide was added to 100 g of deionized water to obtain a graphene oxide aqueous dispersion. Then add 1g of chromium chloride hexahydrate and stir for 1h, then centrifuge. The lower precipitate obtained by centrifugation was dried in a vacuum oven at 45° C. for 6 h, then taken out and ground into powder. Graphene oxide doped with chromium ions was dispersed in 100 g of deionized water, and 5 g of tetrahydrofuran containing 4% (wt%) (5,15-diphenyl)-10,20-bis(4-pyridyl)porphyrin was added The solution was stirred for 2 hours, centrifuged and dried in a vacuum oven at 45°C to obtain a graphene oxide / porphyrin composite (GO-Cr-P) photocatalyst.

Embodiment 2

[0021] Get 20g graphene oxide and add into 200g deionized water, obtain graphene oxide dispersion liquid. Then add 1g of cobalt acetate and stir for 2h, then centrifuge. The lower precipitate obtained by centrifugation was dried in a vacuum oven at 45° C. for 6 h, then taken out and ground into powder. Graphene oxide doped with cobalt ions was dispersed in 250 g of deionized water, and 50 g of tetrahydrofuran containing 4% (wt%) (5,15-diphenyl)-10,20-bis(4-pyridyl)porphyrin was added The solution was stirred for 2 hours, centrifuged and dried in a vacuum oven at 45°C to obtain a graphene oxide / porphyrin composite (GO-Co-P) photocatalyst.

Embodiment 3

[0023] 10 g of graphene oxide was added into 100 g of deionized water to obtain a graphene oxide dispersion. Then add 0.3g potassium chloride and 0.4g zinc acetate, stir for 2h and then centrifuge. The lower precipitate obtained by centrifugation was dried in a vacuum oven at 45° C. for 6 h, then taken out and ground into powder. Graphene oxide doped with potassium ions and zinc ions was dispersed in 150 g of deionized water, and 15 g of 4% (wt%) (5,15-diphenyl)-10,20-di(4-carboxyphenyl) The tetrahydrofuran solution of porphyrin was stirred for 2 hours, centrifuged and dried in a vacuum oven at 45°C to obtain a graphene oxide / porphyrin composite (GO-K-Zn-P) photocatalyst.

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Abstract

The invention belongs to the technical field of photocatalysis, and is specifically a preparation method of a graphene oxide / porphyrin composite photocatalyst. The specific steps of the method of the present invention are as follows: (1) Disperse graphene oxide in water to obtain a graphene oxide dispersion; then add soluble metal salts thereto, then centrifuge, remove the precipitate, dry and grind to obtain powdery Metal ion-doped graphene oxide; (2) Disperse metal ion-doped graphene oxide in water, add a tetrahydrofuran solution containing a porphyrin compound, centrifuge, remove the precipitate, and dry to obtain graphene oxide / porphyrin composite materials. The invention has mild reaction conditions, simple operation and low cost; it uses metal ions as the interface connecting agent of porphyrin / graphene oxide to promote the rapid transfer of photogenerated electrons between graphene oxide and porphyrin, thereby inhibiting the rapid electron transfer of the composite material. -hole recombination, thereby improving the catalytic performance of the catalyst.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a method for preparing a graphene oxide / porphyrin composite photocatalyst. Background technique [0002] As the shortage of fossil fuels and environmental pollution problems have appeared in front of people, the development of a new energy source is the focus of people's attention nowadays. The use of solar energy to produce clean hydrogen through photocatalysis is one of the important ways. However, the photoconversion efficiency of currently studied materials is still low due to the weak absorption of light, fast electron-hole recombination, and low-stability confinement. [0003] Graphene oxide (GO) has excellent structural properties, such as large specific surface area, high electronic and thermal conductivity. In addition, abundant oxygen-containing functional groups, such as epoxy, hydroxyl, and carboxyl, make GO easier to be further modified. CN201310473878 disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22
CPCB01J31/183B01J2531/62B01J2531/845B01J2531/13B01J2531/26B01J2531/025B01J35/39
Inventor 李向清葛日月秦利霞康诗钊
Owner SHANGHAI INST OF TECH