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Nano ZnO microsphere/graphene photocatalyst and preparation method thereof

A photocatalyst and graphene technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of unfavorable photocatalytic activity, cumbersome steps, and high cost , to achieve good photocatalytic performance and photocatalytic effect, simple steps and low cost

Inactive Publication Date: 2014-04-09
CHINA JILIANG UNIV
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Problems solved by technology

For example, some preparation methods are cumbersome and costly, and the reduced graphene is easy to reunite due to van der Waals force, which is not conducive to the improvement of photocatalytic activity.

Method used

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  • Nano ZnO microsphere/graphene photocatalyst and preparation method thereof
  • Nano ZnO microsphere/graphene photocatalyst and preparation method thereof
  • Nano ZnO microsphere/graphene photocatalyst and preparation method thereof

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Embodiment 1

[0024] Using zinc acetate as raw material, bayberry-shaped ZnO nanospheres were prepared by boiling reflux method. 0.025mol zinc acetate and 0.5mL deionized water were added to 250mL diethylene glycol, and the mixed solution was refluxed at 160°C for 1 hour. After the reaction was completed, the product was collected by centrifugal washing and dried at 80°C for 12 hours.

[0025] ZnO / graphene photocatalysts were synthesized by lyophilization. Graphite oxide was dispersed in 80 mL of deionized water, and ultrasonically treated for 0.5-1 hour to obtain a uniform graphene oxide aqueous solution of 0.5 mg / mL. 400 mg of ZnO nanosphere particles were added to 80 mL of an aqueous graphite oxide solution (0.5 mg / mL), and the obtained solution was sonicated for 20 minutes to make the gray ZnO / graphene oxide suspension uniformly mixed. Then the powder after the freeze-drying treatment of the above-mentioned suspension was placed in a hydrogen-nitrogen mixed atmosphere (H 2 :N 2 =1:9)...

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Abstract

The invention belongs to the field of photocatalysis and relates to a nano ZnO microsphere / graphene photocatalyst and a preparation method of the nano ZnO microsphere / graphene photocatalyst. The photocatalyst disclosed by the invention is a nano composite photocatalyst formed by wrapping the surface of a nano ZnO microsphere with graphene. The photocatalyst is characterized in that the nano ZnO microsphere is prepared by a solution backflow method, is waxberry-shaped and consists of small crystals with hexagonal wurtzite structures, and the diameter of the nano ZnO microsphere is about 100-400nm. The nano ZnO microsphere / graphene photocatalyst is prepared by vacuum freeze-drying, thermal reducing and the like, and the process is simple and feasible. By virtue of the introduction of the graphene, the adsorption to organic molecules is enhanced, the spectral absorption range is expanded, and effective separation and transmission of photoproduction electron-hole pairs are promoted, so that ZnO / graphene achieves high photocatalysis efficiency in a methylene blue photocatalysis degrading process. According to the method, the steps are simple, and the cost is low; the obtained ZnO microsphere / graphene photocatalyst is high in catalytic activity, has a good photocatalysis effect and is desired to be applied to photocatalysis treatment on industrial pollutants.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, in particular to a nanometer ZnO microsphere / graphene (ZnO-GE) photocatalyst and a preparation method thereof. Background technique [0002] Organic dyes and wastewater pollutants are the main sources of pollution in industries such as textiles, papermaking, and plastics. In addition to using the common TiO 2 In addition to mitigating environmental pollution through photocatalytic degradation technology, ZnO semiconductor is also an important photocatalyst. Since ZnO has high photosensitive properties, wide band gap (3.37eV) and large exciton energy (60meV), it is very beneficial to the redox process of photocatalytic degradation. [0003] However, the rapid recombination of photogenerated electron and hole pairs in ZnO will lead to a decrease in photocatalytic performance. Therefore, researchers have adopted many methods to suppress the recombination of photogenerated electr...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J35/08
Inventor 陈达王东方平广兴范美强秦来顺吕春菊舒康颖葛其胜石磊
Owner CHINA JILIANG UNIV
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