Preparation method of graphene-nano zinc oxide composite photocatalytical material for adsorbing and degrading nitrosamine

A nano-zinc oxide and composite photocatalysis technology, applied in the interdisciplinary field of disciplines, can solve problems such as outstanding achievements in applied research, and achieve the effects of low cost, good adsorption performance and simple steps

Inactive Publication Date: 2015-04-01
SHANGHAI TOBACCO GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among many pollutant control methods, photocatalytic technology has unique advantages, which can make the reactions that are difficult to achieve under many circumsta

Method used

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  • Preparation method of graphene-nano zinc oxide composite photocatalytical material for adsorbing and degrading nitrosamine
  • Preparation method of graphene-nano zinc oxide composite photocatalytical material for adsorbing and degrading nitrosamine
  • Preparation method of graphene-nano zinc oxide composite photocatalytical material for adsorbing and degrading nitrosamine

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Graphite expansion pretreatment: 3g of natural flake graphite was added to 12ml concentrated H at 80°C 2 SO 4 , 2.5g K 2 S 2 o 8 and 2.5g P 2 o 5 The mixed solution was kept at 80° C. for 4.5 hours, then the mixture was cooled to room temperature, diluted with 500 ml of deionized water and left for 12 hours. The mixture was washed with deionized water, filtered to remove residual acid, and dried at room temperature to obtain pretreated graphite.

[0042] Oxidation into graphite oxide (GO) by Hummer’s chemical method: pretreated natural graphite powder was added to 120ml of concentrated H at 0°C 2 SO 4 In, followed by 15g KMnO 4 Slowly added to the above mixed solution while stirring and continued to stir at below 35°C for 2 hours. Next, add 250ml of deionized water to dilute the mixture. Since the addition of a large amount of water will release a lot of heat, this step is performed in an ice-water bath to ensure that the temperature is lower than 50°C. After a...

Embodiment 2

[0049] The expansion treatment of graphite and the process of oxidation into graphite oxide are the same as in Example 1.

[0050] Weigh 0.1g of graphite oxide and disperse it into deionized water. Graphite oxide is relatively easy to disperse into water, and then the solution is ultrasonicated for 1 hour to peel the graphite oxide into graphene oxide sheets. % graphene oxide dispersion. Then take 10g of the above-mentioned uniformly dispersed graphene oxide dispersion liquid and mix it with 1g of nano-ZnO, stir and ultrasonically disperse the ZnO evenly, and then add 35wt% hydrazine hydrate and graphene oxide according to the mass ratio of hydrazine hydrate and graphene oxide in the system about 6:15. Hydrazine solution, and an appropriate amount of concentrated ammonia water and deionized water, so that the pH of the system is 9-10, and the water content is 98-99wt%. After stirring vigorously for a few minutes, place it in a water bath at 90°C for 2 hours. The reacted mixtur...

Embodiment 3

[0055] The pretreatment of graphite and the step that oxidation forms graphite oxide are with embodiment 1;

[0056] Weigh 0.1g of graphite oxide and disperse it into deionized water. Graphite oxide is relatively easy to disperse into water. Then the solution is ultrasonicated for 1 hour to peel the graphite oxide into graphene oxide sheets. % graphene oxide dispersion. Then take 100g of the uniformly dispersed graphene oxide dispersion prepared above and mix it with 10g of ZnO, stir and ultrasonicate for about half an hour to disperse the ZnO evenly, and then add 35wt% of hydrazine hydrate according to the mass ratio of hydrazine hydrate and GO in the system is about 6:12 solution, and an appropriate amount of concentrated ammonia water and deionized water, so that the pH of the system is 9-10, and the content of solvent water is 98-99 wt%. Dry it in a vacuum oven for 12 hours.

[0057] The electron microscope pictures of the obtained G-ZnO nanocomposites are similar to f...

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Abstract

The invention relates to a preparation method of a graphene-nano zinc oxide composite photocatalytical material for adsorbing and degrading nitrosamine (NNK). The method comprises the steps of firstly preprocessing natural graphite in an expanding manner, oxidizing the graphite to graphite oxide by adopting a Hummers chemical method, and synthesizing the graphene-nano zinc oxide composite photocatalytical material by virtue of in-situ reaction under a water-bath condition. Due to the introduction of graphene, effectiveness in separation and transmission of photo-generated electron hole pairs can be promoted, and the G-ZnO composite material has good adsorption performance and photocatalytical degrading performance in the process for photocatalytically degrading the NNK. The method is simple in step and low in cost. The prepared composite photocatalyst is high in activity and is expected to be used for the photocatalytically treatment of low-concentration high-hazard pollutants in the environment.

Description

technical field [0001] The invention relates to a preparation method of a graphene-nanometer zinc oxide composite photocatalytic material for adsorbing and degrading nitrosamines and the composite photocatalytic material prepared by the method, belonging to the interdisciplinary field of materials, chemistry, environment and other disciplines. Background technique [0002] Since the new century, cases of environmental pollution endangering health abound. In addition to strict emission control of environmental pollutants, complete degradation has become an increasingly urgent task. [0003] Smoke is an extremely complex mixture, but only 0.6% of harmful substances, of which 0.2% (more than 60 kinds) are carcinogens and suspected carcinogens. There are seven types of substances blacklisted by IRAC (International Association for Research on Cancer) (polycyclic aromatic hydrocarbons, heterocyclic aromatic hydrocarbons, N-nitrosamines, aromatic amines, aldehydes, heterogeneous o...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J20/20A62D3/176A62D101/47
Inventor 徐同广张晨郑晓曼杨振东石睿周骏
Owner SHANGHAI TOBACCO GRP CO LTD
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