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Recyclable zinc oxide/graphene aerogel photocatalyst and preparation method thereof

A graphene airgel and photocatalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of low photocatalytic efficiency, powder catalyst Loss and other problems, to achieve the effect of simple preparation process, improved photocatalytic degradation performance, and good elasticity

Active Publication Date: 2017-05-31
HENAN NORMAL UNIV
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  • 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 aerogel 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 aerogel photocatalyst and a preparation method thereof, belonging to the technical field of photocatalytic material synthesis. The technical scheme is characterized by comprising the following steps: preparing graphene oxide from the raw material graphite powder by an improved Hummers' method; making the prepared graphene oxide into a graphene oxide aqueous solution with mass concentration of 3mg / mL; adding 0.5-2.5g of zinc acetate, and performing hydrothermal reaction in a hydrothermal reaction kettle at 160 DEG C for 10h to obtain hydrogel; and performing dialysis treatment and freeze drying to obtain a zinc oxide / graphene aerogel photocatalyst. In the invention, a zinc oxide / graphene aerogel photocatalyst easy to recycle is prepared by a one-pot method; the aerogel photocatalyst has relatively high degradation efficiency against organic pollutants under natural sunlight irradiation; and the preparation technology is simple and can be repeatedly utilized.

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 Applications(China)
IPC IPC(8): B01J23/06C02F1/30C02F101/30
CPCC02F1/30B01J23/06C02F2101/308B01J35/23B01J35/39Y02W10/37
Inventor 董淑英金佳郭腾丁旭辉岳小萍赵银兰张方圆杨鹏艳
Owner HENAN NORMAL UNIV
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