Zinc oxide/carbon quantum dot composite photocatalyst, preparation method and application thereof

A technology of carbon quantum dots and zinc oxide, applied in the field of photocatalyst, zinc oxide/carbon quantum dot composite photocatalyst and its preparation, can solve the problems of poor reusability, low photocatalytic efficiency and high production cost, and achieve low cost, Good photodegradation effect, simple operation

Active Publication Date: 2019-08-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Another object of the present invention is to provide the application of a zinc oxide / carbon quantum dot (CQDs) composite photocatalyst in the photocatalytic degradation of organic pollutants, which can realize the treatment of various organic pollutants under simulated sunlight, and solve the problem of Solved the problems of low photocatalytic efficiency, poor reusability and high production cost of traditional photocatalysts in the past

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  • Zinc oxide/carbon quantum dot composite photocatalyst, preparation method and application thereof
  • Zinc oxide/carbon quantum dot composite photocatalyst, preparation method and application thereof
  • Zinc oxide/carbon quantum dot composite photocatalyst, preparation method and application thereof

Examples

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Embodiment 1

[0057] A kind of zinc oxide / carbon quantum dot composite photocatalyst is prepared according to the following method:

[0058] 1) Add 6.25mL HNO 3 (Its mass fraction is 68wt.%) and 9.00mL ethylene glycol are simultaneously added to 4.75mL deionized water and mixed to obtain a mixed solution a;

[0059] 2) Add 1.5g of L-cysteine ​​to 20mL of the mixed solution a obtained in step 1, stir at 600rpm for 10min, and obtain the mixed solution b after mixing evenly, transfer the mixed solution b to a hydrothermal reaction kettle for water Heat reaction, react at 180°C for 10h, after the reaction, cool the product to room temperature (25°C), centrifuge (10000rpm, 1h) to remove undispersed solids, and further dialyze the supernatant (MWCO 3500) to remove carbon quantum dots ( N, S-CQDs) impurities in the sample to obtain a mixed solution c, the pH of the mixed solution c is 3.80;

[0060] 3) Prepare zinc nitrate with a concentration of 0.0089 g / mL in 75 mL of deionized water, and add ...

Embodiment 2

[0067] A kind of zinc oxide / carbon quantum dot composite photocatalyst is prepared according to the following method:

[0068] 1) Add 6.25mL HNO 3 (Its mass fraction is 68wt.%) and 9.00mL ethylene glycol are simultaneously added to 4.75mL deionized water and mixed to obtain a mixed solution a;

[0069] 2) Add 1.5g of L-cysteine ​​to 20mL of the mixed solution a obtained in step 1, stir at 600rpm for 10min, and obtain the mixed solution b after mixing evenly, transfer the mixed solution b to a hydrothermal reaction kettle for water Heat reaction, react at 180°C for 10h, after the reaction, cool the product to room temperature (25°C), centrifuge (10000rpm, 1h) to remove undispersed solids, and further dialyze the supernatant (MWCO 3500) to remove carbon quantum dots ( N, S-CQDs) impurities in the sample to obtain a mixed solution c, the pH of the mixed solution c is 3.80;

[0070] 3) Prepare zinc nitrate with a concentration of 0.0089 g / mL in 75 mL of deionized water, and add ...

Embodiment 3

[0077] A kind of zinc oxide / carbon quantum dot composite photocatalyst is prepared according to the following method:

[0078] 1) Add 6.25mL HNO 3 (Its mass fraction is 68wt.%) and 9.00mL ethylene glycol are simultaneously added to 4.75mL deionized water and mixed to obtain a mixed solution a;

[0079] 2) Add 1.5g of L-cysteine ​​to 20mL of the mixed solution a obtained in step 1, stir at 600rpm for 10min, and obtain the mixed solution b after mixing evenly, transfer the mixed solution b to a hydrothermal reaction kettle for water Heat reaction, react at 180°C for 10h, after the reaction, cool the product to room temperature (25°C), centrifuge (10000rpm, 1h) to remove undispersed solids, and further dialyze the supernatant (MWCO 3500) to remove carbon quantum dots ( N, S-CQDs) impurities in the sample to obtain a mixed solution c, the pH of the mixed solution c is 3.80;

[0080] 3) Prepare zinc nitrate with a concentration of 0.0089 g / mL in 75 mL of deionized water, and add ...

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Abstract

The invention discloses a zinc oxide/carbon quantum dot composite photocatalyst, a preparation method and application thereof. Aiming at the problems existing in the zinc oxide composite photocatalystat present, the synthesis method of the zinc oxide composite photocatalyst is improved; the zinc oxide/carbon quantum dot composite photocatalyst is prepared by combining carbon quantum dots with three-dimensional zinc oxide nanoflowers synthesized by a hydrothermal method. The structure of the composite photocatalyst is a nanoflower formed by stacking nanosheets, the synthetic morphology is uniform, and the composite photocatalyst has good crystallization performance. The composite photocatalyst can be used for treating various organic pollutants under simulated sunlight, and the problems oflow photocatalytic efficiency, poor reusability, high production cost and the like of the traditional photocatalyst in the prior art are solved. Meanwhile, the preparation method is simple to operateand low in cost, and has good reusability and stability.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis and relates to a photocatalyst, in particular to a zinc oxide (ZnO) / carbon quantum dot (CQDs) composite photocatalyst and a preparation method and application thereof. Background technique [0002] With the continuous development of industrialized society, some environmental pollutants, especially antibiotic organic pollutants, have been continuously detected in pharmaceutical wastewater, domestic wastewater, factory pollutants and other systems. Some antibiotics are even found in daily drinking water, which will not only endanger human health due to antibiotic resistance, but also damage the overall human immune system, making it difficult for us to resist more serious diseases. Due to the gradual increase in the use of antibiotics, the total amount of pollutants has also continued to increase, so we need to further study a variety of effective methods to achieve the treatment of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J35/02C02F1/30C02F101/38
CPCB01J23/06B01J35/004B01J35/023C02F1/30C02F2305/10C02F2101/38
Inventor 齐崴黄仁亮屈彦宁苏荣欣
Owner TIANJIN UNIV
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