A kind of copper-containing zinc oxide/graphene quantum dot catalyst and preparation method thereof

A technology of graphene quantum dots and zinc oxide, applied in the field of materials, can solve the problems of reducing photocatalytic efficiency, photocorrosion, and high cost of precious metals, and achieve the effects of high photocatalytic degradation rate, preventing photocorrosion, and simple operation

Inactive Publication Date: 2017-07-18
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ZnO has the following defects in the photocatalytic reaction: first, the recombination rate of photogenerated electrons and holes is high, and the effective carrier concentration is low, which reduces the photocatalytic efficiency and limits its practical application; , the surface of ZnO is prone to photocorrosion, resulting in a decrease in the stability and catalytic activity of the catalyst, and it is difficult to achieve the expected catalytic efficiency.
Since noble metal nanoparticles can capture photo-generated electrons, the photo-generated electrons migrate to the surface of the nanoparticles, improving the separation rate of photo-generated electrons and holes, and the cost of most noble metals is relatively high.
In recent years, graphene quantum dots (GQDs), as zero-dimensional carbon nanomaterials, have been widely used in optical devices, biological imaging and The field of photocatalysis shows great application potential, and GQDs can be used as semiconductors, which can generate electron-hole pairs by themselves under the excitation of ultraviolet light, thereby providing more highly active free radicals to facilitate the degradation of organic matter, which has not yet been used in the preparation of photocatalysts. reported

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  • A kind of copper-containing zinc oxide/graphene quantum dot catalyst and preparation method thereof
  • A kind of copper-containing zinc oxide/graphene quantum dot catalyst and preparation method thereof
  • A kind of copper-containing zinc oxide/graphene quantum dot catalyst and preparation method thereof

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preparation example Construction

[0034] The invention relates to a copper-containing zinc oxide / graphene quantum dot catalyst and a preparation method thereof. The copper-containing zinc oxide / graphene quantum dot catalyst is a double semiconductor photocatalyst for degrading organic dyes, and the double semiconductor photocatalyst The chemical structure is Cu x / ZnO / GQDs, the x satisfies: 0.2≤x≤0.4. The raw materials for preparing the double semiconductor photocatalyst include high-purity graphite rods, silver / silver chloride electrodes, zinc nitrate, and copper nitrate, and the molar ratio of the copper nitrate to zinc nitrate is 0.2-0.4:1.

[0035] The preparation method of the double-semiconductor photocatalyst includes three processes, such as figure 2 As shown, first prepare a light yellow aqueous solution of graphene quantum dots, such as figure 1 As shown, the graphene quantum dot aqueous solution was prepared by electrochemical cyclic voltammetry, and the specific operation steps were as follows: ...

Embodiment approach 1

[0042] The high-purity graphite rod is used as the working electrode and the counter electrode at the same time, Ag / AgCl is used as the reference electrode, the concentration is 0.1mol / L, phosphate buffer saline (PBS) with pH=7.0 is used as the electrolyte, and the range of cyclic voltammetry voltage is -5 to 5V, scan rate 0.5 V / s, scan circles 3000. The obtained brown-yellow aqueous solution was filtered with a 220 nm water-based filter head, and then dialyzed with a dialysis bag with a molecular weight cut-off of 3500 Da. The dialysis time was 4 days, and the deionized water was changed every 6 hours.

[0043] According to the proportioning of Cu / (Cu+ZnO)=30%, take the zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 0.1464g of copper nitrate (Cu(NO 3 ) 2 ·3H 2 O), mixed and dissolved in 20 ml ethylene glycol methyl ether solvent, stirred on a magnetic stirrer for 2 hours, then aged for 2 days, to obtain a concentration of Cu that was 0.1 mol / L 0.3 / ZnO precursor sol. The glass...

Embodiment approach 2

[0048] The high-purity graphite rod is used as the working electrode and the counter electrode at the same time, Ag / AgCl is used as the reference electrode, the concentration is 0.1mol / L, phosphate buffer saline (PBS) with pH=7.0 is used as the electrolyte, and the range of cyclic voltammetry voltage is -3 to 3V, scan rate 0.5 V / s, scan circles 5000. The obtained brownish-yellow aqueous solution was filtered with a 220 nm water-based filter head, and then dialyzed with a dialysis bag with a molecular weight cut-off of 3500 Da. The dialysis time was 6 days, and the deionized water was changed every 8 hours.

[0049] Weigh 0.4808g of zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 0.0976g of copper nitrate (Cu(NO 3 ) 2 ·3H 2 O), mixed and dissolved in 20 ml ethylene glycol methyl ether solvent, stirred on a magnetic stirrer for 1 hour, then aged for 3 days, to obtain a concentration of Cu that was 0.1 mol / L 0.2 / ZnO precursor sol. The glass substrate cleaned ultrasonically with ac...

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Abstract

The invention relates to the field of materials, in particular to a copper-containing zinc oxide / graphene quantum dot catalyst and a preparation method. By preparing metal copper (Cu) nanoparticles doped ZnO composite film, the separation rate of photogenerated electrons and holes can be improved, and the photocatalytic performance can be improved. At the same time, GQDs aqueous solution is spin-coated on the surface of the composite film to prepare The copper-containing zinc oxide / graphene quantum dot dual semiconductor catalyst system can not only effectively prevent the photocorrosion of ZnO, but also use GQDs as semiconductors to generate electron-hole pairs by themselves under the excitation of ultraviolet light, thereby providing more The highly active free radicals are conducive to the degradation of organic matter.

Description

technical field [0001] The invention relates to the field of materials, in particular to a copper-containing zinc oxide / graphene quantum dot catalyst and a preparation method. Background technique [0002] With the rapid growth of industry, environmental pollution is becoming more and more serious, especially the widespread use of organic matter in papermaking, textile printing and dyeing, leather manufacturing and other industries has produced a large amount of industrial wastewater. If it is not properly treated, it will harm human health and the ecological environment. cause great harm. Therefore, it is extremely important to seek an efficient and economical treatment method for organic pollutants, which also prompts the widespread attention of photocatalytic materials and becomes a research hotspot. Photocatalysis means that when semiconductor materials are exposed to light, electrons in the valence band absorb energy and are excited to the conduction band, while holes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80C02F1/32C02F101/30
Inventor 李妍戈娟王君
Owner UNIV OF SCI & TECH BEIJING
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