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Graphene modified composite mesoporous carbon microsphere air purifying preparation

An air purifier, mesoporous carbon technology, applied in the field of air purification, to achieve the effect of improving degradation effect, strong photocatalytic properties, and broadening the range of light response

Active Publication Date: 2017-09-19
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In summary, although hollow carbon microspheres and TiO 2 The research on photocatalysts has made great progress, but there are still many problems to be explored and solved. In view of the decisive role of the morphology of nanomaterials on their properties, how to realize the preparation of carbon microspheres with mesoporous shell structure, surface mesoporous Uniform distribution, fine control of inner pore size, graphene modified nano-TiO 2 Preparation of nano-TiO by graphene under the condition of weak light source 2 Catalytic mechanism, graphene modified nano-TiO 2 The immobilization on the surface of mesoporous shell hollow carbon microspheres is worthy of in-depth research and demonstration, and then successfully developed a nano-catalytic mesoporous shell carbon microsphere purification material with controllable structure and stable performance for weak light sources in haze environments

Method used

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Embodiment 1

[0045] The invention provides a method for preparing a composite mesoporous carbon microsphere air purifier, comprising the following steps:

[0046] Step (1) Synthesis of graphene oxide (GO): Graphene oxide was prepared by the modified Hummers method. Using graphite flakes as raw materials and concentrated H2SO4 and KMnO4 as oxidants, graphite oxide is prepared first by a two-step method, and then graphene oxide is prepared by ultrasonic dispersion. Characterized by means of XRD, TEM, SEM, etc., to obtain graphene oxide with a single-layer or few-layer structure, and ensure that its surface contains a large number of oxygen-containing groups such as -OH, -COOH, C-O-C, and C=O. The dispersion of graphene oxide in aqueous solution provides a large number of active sites for the preparation of graphene-based titania nanocomposites in the later stage.

[0047] Assemble a 250mL three-necked flask in an ice-water bath, add 23mL of concentrated sulfuric acid, add a solid mixture of...

Embodiment 2

[0064] On the basis of the foregoing embodiments, this embodiment provides a method for preparing a composite mesoporous carbon microsphere air purifier, comprising the following steps:

[0065] Step 1) Synthesis of Graphene Oxide (GO)

[0066] Assemble a 250mL three-neck flask in an ice-water bath, add 40mL of concentrated sulfuric acid, add a solid mixture of 1 g of graphite powder and 1 g of sodium nitrate under stirring, then slowly add 5 g of potassium permanganate, and control the reaction temperature not to exceed 10 °C. After stirring and reacting for 40 min, raise the temperature to about 50°C, continue stirring for 3 h, then slowly add 60 mL of deionized water, continue stirring for 30 min, then raise the temperature to 90°C, and add 5 mL (mass fraction 30%) of hydrogen peroxide to reduce the residual After the reaction solution turns bright yellow, filter it while it is hot, and wash it with 5% HCl solution and deionized water until the pH of the filtrate is 6.7, wh...

Embodiment 3

[0079] On the basis of the foregoing embodiments, this embodiment provides a method for preparing a composite mesoporous carbon microsphere air purifier, comprising the following steps:

[0080] Step 1) Synthesis of Graphene Oxide (GO)

[0081] Assemble a 250mL three-necked flask in an ice-water bath, add 50mL of concentrated sulfuric acid, add a solid mixture of 1.5g of graphite powder and 1.5g of sodium nitrate under stirring, then slowly add 7g of potassium permanganate, and control the reaction temperature not to exceed 10°C. After stirring and reacting for 60 minutes, raise the temperature to about 50°C, continue stirring for 4 hours, then slowly add 80 mL of deionized water, continue stirring for 40 minutes, then raise the temperature to 90°C, and add 5 mL (mass fraction 30%) of hydrogen peroxide to reduce the residual After the reaction solution turns bright yellow, filter it while it is hot, and wash it with 5% HCl solution and deionized water until the pH of the filtr...

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Abstract

The invention provides a graphene modified composite mesoporous carbon microsphere air purifying preparation. A certain amount of beta-cyclodextrin is added to thin-layered nano-SiO2 particles covering the surfaces of obtained micro-SiO2 particles, a certain quantity of obtained RGO / TiO2 nanoparticles is added simultaneously, -OH, -COOH, C-O-C and C=O oxygen-containing functional groups rich on the surface of graphene are adsorbed by and bonded with the RGO / TiO2 nanoparticles on the basis of the molecular recognition characteristic of beta-cyclodextrin, then a certain amount of CTAB (cetyltrimethylammonium bromide) surfactant is added, CTAB serving as a micelle stabilizer can stop the RGO / TiO2 nanoparticles from further hydrolysis and growth, and finally, the novel air purifying preparation adopting RGO / TiO2 supported by carbon microspheres with a mesoporous shell structure is obtained. With adoption of the scheme, the purity is high, RGO / TiO2 supported by the carbon microspheres with the mesoporous shell structure in powder is better in bonding performance, uniform in distribution and controllable in dimension at mesopores, and the air purifying preparation can be used for purifying polluted air and removing dust in a haze environment as well as photo-catalytically degrading and separating nitric oxide, sulfide or other organic pollutants in the polluted air.

Description

technical field [0001] The invention belongs to the technical field of air purification, and in particular relates to a method for preparing a composite mesoporous carbon microsphere air purifier. Background technique [0002] Scientific research shows that: high concentration of fine particulate matter (PM2.5) pollution is the root cause of smog, PM2.5 is directly discharged into the air by primary particles (mainly including dusty particles and produced by burning plants and fossil fuels) carbon black particles) and secondary particles generated by chemical transformation of gaseous pollutants in the air. The root cause of Beijing's severe smog is the large amount of nitrogen oxides emitted by automobile exhaust, sulfur compounds emitted by power plants and steel mills around Beijing, and a small amount of carbon monoxide (CO) and nitrogen oxides emitted by burning coal for heating and natural gas for domestic use. (NOx), hydrocarbons (HC), lead (Pb), etc. These sulfur o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01D53/86B01J20/30B01J20/22B01J20/28B01D53/94B01J21/18B01J35/10
CPCB01D53/02B01D53/86B01D53/9413B01J20/103B01J20/20B01J20/22B01J20/28021B01J20/28054B01J21/18B01D2255/20707B01D2258/01B01D2257/504B01D2255/802B01D2258/06B01J35/61B01J35/60Y02C20/40
Inventor 田浩亮周子民汤智慧王长亮郭孟秋崔永静高俊国张欢欢
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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