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Recyclable zinc oxide/graphene airgel photocatalyst and preparation method thereof

A graphene aerogel, photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of easy loss of powder catalysts and photocatalytic efficiency. It can improve the photocatalytic degradation performance, the preparation process is simple, and the elasticity is good.

Active Publication Date: 2020-02-04
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

ZnO has the same 2 The approximate band gap is 3.2eV. In some organic degradation studies, it was found that ZnO has higher electron mobility and exhibits higher electron mobility than TiO 2 Higher photocatalytic activity, but due to the rapid recombination of photogenerated electron-hole pairs in single-phase semiconductor materials, the photocatalytic efficiency is still very low, and the powder catalyst is easy to lose

Method used

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  • Recyclable zinc oxide/graphene airgel photocatalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Graphene oxide was prepared from graphite powder by modified Hummers’ method (S. Y. Dong, J. Y. Sun, Y. K. Li, C. F. Yu, Y. H. Li, J. H. Sun, ZnSnO 3 hollow nanospheres / reduced graphene oxide nanocomposites as high-performance photocatalysts fordegradation of metronidazole, Appl. Catal. B Environ. 144 (2014) 386-393), and then the obtained graphene oxide was formulated into a graphene oxide aqueous solution with a mass concentration of 3mg / mL, and 2.5g of zinc acetate was added, and then transferred to a closed polytetrafluoroethylene reactor at 160 ℃ hydrothermal reaction for 10 h to obtain a hydrogel, which was subjected to dialysis and then freeze-dried to obtain a zinc oxide / graphene airgel photocatalyst. After 6 hours of natural sunlight irradiation, the zinc oxide / graphene airgel photocatalyst has a removal rate of 97.04% for methylene blue in methylene blue dye wastewater. However, the airgel photocatalyst is easily broken by water flow impact during photocata...

Embodiment 2

[0016] Adopt improved Hummers'method to prepare graphene oxide with graphite powder as raw material, then the graphene oxide that makes is formulated into the graphene oxide aqueous solution that mass concentration is 3mg / mL, adds 2g zinc acetate, transfers to polytetrafluoroethylene then Hydrothermal reaction at 160°C for 10 h in a closed reactor to obtain a hydrogel, which was subjected to dialysis and then freeze-dried to obtain a zinc oxide / graphene airgel photocatalyst. After 6 hours of natural sunlight irradiation, the zinc oxide / graphene airgel photocatalyst has a removal rate of 99.65% for methylene blue in methylene blue dye wastewater. broken, the mechanical stability needs to be further improved.

Embodiment 3

[0018] Adopt improved Hummers'method to prepare graphene oxide with graphite powder as raw material, then the graphene oxide prepared is formulated into the graphene oxide aqueous solution that mass concentration is 3mg / mL, adds 1.5g zinc acetate, then transfers to polytetrafluoroethylene Hydrothermal reaction at 160°C for 10 h in an ethylene airtight reactor to obtain a hydrogel, which was subjected to dialysis and then freeze-dried to obtain a zinc oxide / graphene airgel photocatalyst. After 6 hours of natural sunlight irradiation, the ZnO / graphene airgel photocatalyst has a removal rate of 99.89% for methylene blue in methylene blue dye wastewater. The airgel photocatalyst will not change under the impact of water flow during the photocatalytic degradation process, has good mechanical stability, and can eliminate interstitial water by extrusion, which is convenient for repeated recycling of the airgel photocatalyst.

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Abstract

The invention discloses a recyclable zinc oxide / graphene airgel photocatalyst and a preparation method thereof, and belongs to the technical field of synthesis of photocatalytic materials. The key points of the technical solution of the present invention are: first, use the improved Hummers' method to prepare graphene oxide using graphite powder as raw material, and then prepare the prepared graphene oxide into a graphene oxide aqueous solution with a mass concentration of 3 mg / mL, and add 0.5- 2.5g of zinc acetate was then placed in a hydrothermal reactor for hydrothermal reaction at 160°C for 10 hours to obtain a hydrogel, which was then subjected to dialysis treatment and then freeze-dried to obtain a zinc oxide / graphene aerogel photocatalyst. The present invention uses a one-pot method to prepare a zinc oxide / graphene airgel photocatalyst that is easy to recycle. The airgel photocatalyst has the characteristics of high efficiency in degrading organic pollutants under natural sunlight, and is prepared The process is simple and can be recycled repeatedly.

Description

technical field [0001] The invention belongs to the technical field of synthesis of photocatalytic materials, in particular to a recyclable zinc oxide / graphene airgel photocatalyst and a preparation method thereof. Background technique [0002] Nano-semiconductor photocatalyst is a semiconductor material that is excited to generate photogenerated electrons and holes under light irradiation, and the photoelectrons generated are usually used to degrade dyes or pollutants. However, in the process of photocatalytic degradation, there are three aspects that need to be paid attention to: (1) the effective transfer of photogenerated electrons can effectively prevent the recombination of photogenerated electrons and holes; (2) the catalyst has a good adsorption capacity for dyes or pollutants ; (3) The catalyst is loaded on a suitable carrier. [0003] In view of the above three aspects, graphene is an ideal carrier that can meet the above requirements. Due to the excellent conduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06C02F1/30C02F101/30
CPCC02F1/30B01J23/06C02F2101/308B01J35/23B01J35/39Y02W10/37
Inventor 董淑英赵银兰张方圆郭腾丁旭辉岳小萍杨鹏艳金佳
Owner HENAN NORMAL UNIV
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