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Preparation method for porous graphene film and application of porous graphene film to capturing of carbon dioxide

A technology of porous graphene and filtration methods, applied in separation methods, chemical instruments and methods, membranes, etc., can solve problems such as difficult to prepare large-scale, defect-free, etc., achieve good physical and chemical properties, good market prospects, manufacturing low cost effect

Active Publication Date: 2018-09-25
苏州市迈尔特材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing polymer-based membranes have been extensively studied, but due to the strong trade-off relation between the two main parameters of permeability and selectivity, separation membranes based on such material properties suffer from separation. Upper limits
It has been found that many inorganic membrane materials (such as carbon and zeolites) can overcome the separation upper limit of polymer membranes and show excellent separation performance, but it is usually difficult to prepare large-scale, defect-free membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a porous graphene membrane, comprising:

[0043] Step 1: Preparation of porous α-Al by colloidal filtration method2 o 3 Substrate:

[0044] 11) α-Al with an average particle size of 300nm 2 o 3 The powder is dispersed in an aqueous solution and stabilized with nitric acid at pH=2;

[0045] 12) The above stabilized α-Al 2 o 3 The green body is obtained by vacuum filtration technology;

[0046] 13) drying the above green embryos in the air for 24 hours;

[0047] 14) Place the dried green body in a muffle furnace, and sinter it at 950°C for 10 hours in an air atmosphere to obtain a disc-shaped ceramic substrate with a uniform surface and no defects, wherein the heating and cooling rates of the muffle furnace are 2°C / min.

[0048] The resulting porous α-Al 2 o 3 Matrix porosity ~ 35%, thickness ~ 2mm, diameter 42.5mm, pore size ~ 100nm, surface pore size ~ 40nm, surface roughness ~ 30nm;

[0049] Step 2: Preparation of Gd-doped CeO by sono...

Embodiment 2

[0059] A preparation method of a porous graphene membrane, comprising:

[0060] Step 1: Preparation of porous α-Al by colloidal filtration method 2 o 3 Substrate: refer to Example 1 for specific steps;

[0061] Step 2: Preparation of 8.5 wt% Gd-doped CeO by sonochemical precipitation 2 The nanoparticle sol precursor, specific steps with reference to embodiment 1;

[0062] Step 3: Deposit a layer of Ce on the alumina substrate by dip-pulling method 0.9 Gd 0.1 o 1.95 (GDC) precursor film, make the GDC buffer layer by drying and rapid annealing process, to improve the bonding strength of the graphene film layer and the substrate, the specific steps are with reference to embodiment 1;

[0063] Step 4: Coating the graphene oxide suspension with a concentration of 1 mg / mL on α-Al by spin-coating process 2 o 3 On the supported GDC buffer layer, then dry the graphene oxide film in an oven at 110°C;

[0064] Step 5: Using H 2 Atmospheric thermal reduction process removes func...

Embodiment 3

[0067] A preparation method of a porous graphene membrane, comprising:

[0068] Step 1: Preparation of porous α-Al by colloidal filtration method 2 o 3 Substrate: refer to Example 1 for specific steps;

[0069] Step 2: Preparation of 8.5 wt% Gd-doped CeO by sonochemical precipitation 2 The nanoparticle sol precursor, specific steps with reference to embodiment 1;

[0070] Step 3: Deposit a layer of Ce on the alumina substrate by dip-pulling method 0.9 Gd 0.1 o 1.95 (GDC) precursor film, make the GDC buffer layer by drying and rapid annealing process, to improve the bonding strength of the graphene film layer and the substrate, the specific steps are with reference to embodiment 1;

[0071] Step 4: Coating the graphene oxide suspension with a concentration of 1.5 mg / mL on α-Al by spin coating process 2 o 3 On the supported GDC buffer layer, then dry the graphene oxide film in an oven at 110°C;

[0072] Step 5: Using H 2 Atmospheric thermal reduction process removes fu...

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Abstract

The invention discloses a preparation method for a porous graphene film and application of the porous graphene film to the capturing of carbon dioxide, belonging to the field of film preparation. Thepreparation method for the porous graphene film comprises the following steps: step 1, preparing a porous alpha-Al<2>O<3> matrix by using a colloidal filtration method; step 2, preparing a Gd-doped CeO<2> nanoparticle sol precursor by using an ultrasonic chemical precipitation method; step 3, depositing a layer of Ce<0.9>Gd<0.1>O<1.95> precursor film on the porous alpha-Al<2>O<3> matrix by using adip-coating method, and carrying out drying and rapid annealing so as to obtain a GDC buffer layer; step 4, coating the alpha-Al<2>O<3> supported GDC buffer layer with graphene oxide suspensions withdifferent concentrations by using a spin coating process, and then carrying out drying in an oven to prepare a graphene oxide film; and step 5, preparing the porous graphene film by using a H<2> atmosphere thermal reduction process. The porous graphene film prepared in the invention has good separation performance, mechanical properties and chemical stability; and the preparation method is simplein preparation process, low in manufacturing cost and capable of realizing mass production of the porous graphene film, and has good market prospects.

Description

technical field [0001] The invention belongs to the field of film preparation, and in particular relates to a preparation method of a porous graphene film and its application in the separation of carbon dioxide flue gas. Background technique [0002] In recent years, with the rapid development of industry, the consumption of fossil fuels has increased sharply, and the flue gas after combustion of this fuel contains 13vol% carbon dioxide (CO 2 ), 17vol%H 2 O, 67vol% N 2 , 2vol%O 2 and other gases, making atmospheric CO 2 content increases year by year. CO 2 As a major greenhouse gas, it has a serious impact on the climate, leading to severe environmental problems such as extreme weather and sea level rise, and seriously threatening the normal production and life of human beings. For this reason, the reduction of CO 2 emissions are imperative. However, currently for CO 2 Flue gas capture technology has always had the following challenges: (1) flue gas CO 2 Gas pressu...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D53/22
CPCB01D53/228B01D67/006B01D71/021B01D2258/0283B01D2325/02Y02C20/40
Inventor 范润德燕克兰刘峣张子栋
Owner 苏州市迈尔特材料科技有限公司
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