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Graphene oxide film, preparation method and applications thereof

A graphene membrane and graphene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve high water permeation selectivity and permeation flux, and the effects of economic and technical means and environmental protection technical means

Active Publication Date: 2015-09-02
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem faced by most polymer and polymer / inorganic particle hybrid membranes is that they can only achieve better performance in one of the two aspects of selectivity and flux.

Method used

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  • Graphene oxide film, preparation method and applications thereof
  • Graphene oxide film, preparation method and applications thereof
  • Graphene oxide film, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Preparation of graphene oxide membrane on a tubular ceramic carrier for separating a mixture of water and ethanol

[0038] Step 1: Add 100g of deionized water to 1g of graphite oxide and sonicate for 4h at room temperature; centrifuge at 9000rpm for 20min, take the supernatant; add deionized water to the precipitate, sonicate for 20min, and centrifuge under the same conditions. Cycle three times. The obtained clear liquid was centrifuged at 15000 rpm for 60 min, and the precipitate was dissolved in deionized water to form a 2 mg / ml graphene oxide hydrosol.

[0039] Step 2: Select a porous ceramic tube as the carrier. The inner and outer diameters of the porous ceramic tube are 10mm and 7mm, respectively, and the average pore diameter of the inner surface is 100nm. The two ends of the carrier are sealed with glaze, and the effective membrane length is 35mm. After washing, drying, roasting at 500℃ for 1h. The outer surface is sealed with PTFE tape.

[0040] Step 3: ...

Embodiment 2

[0047] Example 2 Preparation of graphene oxide membrane on a ceramic hollow fiber support for separating a mixture of water and isopropanol

[0048] The difference from Example 1 is: in step 1, the concentration of graphene oxide hydrosol is 5mg / ml; in step 2, ceramic hollow fiber is selected as the carrier, the outer side is the selective layer, and the inner and outer diameters are 1.8mm respectively And 1.4mm, the average pore diameter of the inner surface is 50nm, the two ends of the carrier are sealed with glaze, the effective membrane length is 70mm, after washing and drying, roasting at 500℃ for 1h; Step 4, use pervaporation separation process to separate the mixture of water and isopropanol, operation The temperature is 70°C, the system pressure is 0.1MPa, and the feed mass concentrations of isopropanol:water are 90:10, 85:15, and 80:20 respectively. The remaining steps are the same as in Example 1. The separation test results are shown in Table 2:

[0049] Table 2 Test r...

Embodiment 3

[0052] Example 3 Preparation of graphene oxide membrane on a tubular ceramic carrier for separating a mixture of water and o-xylene

[0053] The difference from Example 1 is that in step 1, the concentration of the graphene oxide hydrosol is 0.05 mg / ml; in step 3, pressure assisted deposition is used to install the ceramic tube into the permeation component, and the graphite oxide is introduced from the inside of the membrane tube Alkene hydrosol, with a certain pressure of nitrogen as the driving force, the pressure range is 1-10bar; step 5 adopts the pervaporation separation process to separate water and o-xylene mixture, the operating temperature is 70℃, the system pressure is 0.1MPa, and the feed mass concentration is close to Xylene: water is 90:10, 85:15, 80:20 respectively. The remaining steps are the same as in Example 1. The separation test results are shown in Table 3:

[0054] Table 3 Example 3 o-xylene and water vapor phase permeation separation test results

[0055] ...

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Abstract

The present invention discloses a graphene oxide film preparation method, which comprises: 1) carrying out an oxidation treatment on graphite powder to obtain a graphite oxide, and peeling to form graphene oxide; 2) dissolving the graphene oxide in water to form a clarified graphene oxide sol; 3) carrying out washing and surface treatment on a porous carrier; and 4) forming the graphene oxide film on the porous carrier surface. The present invention further discloses the graphene oxide film prepared according to the method, and applications of the graphene oxide film in water-containing azeotrope separation. According to the present invention, the inexpensive graphite material is used to prepare the graphene oxide composite film, and the prepared graphene oxide composite film has characteristics of high water permeation selectivity and high permeation flux and can effectively separate the water-containing azeotrope so as to provide an efficient, environmentally friendly and economical way for the water-containing azeotrope separation.

Description

Technical field [0001] The invention relates to the technical field of chemical separation, in particular to a graphene oxide composite membrane, its preparation method, and its application in the separation and purification of water-containing azeotropes. Background technique [0002] Short-chain low-boiling point alcohols can easily form azeotropes with different ratios to water, such as C2-C6 alcohols. Similarly, benzene, toluene, xylene, chloroform, carbon tetrachloride, dichloroethane, formic acid, ethyl acetate, pyridine and tetrahydrofuran, etc., can also easily form azeotropes with different ratios with water. The commonly used separation methods in the industry are pressure swing distillation and extractive distillation, but these methods have many disadvantages, such as high energy consumption, expensive equipment, the need to add entrainers and complex operations. Therefore, finding an efficient, inexpensive and convenient separation method for the separation of azeot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00B01D61/00
Inventor 孙予罕曾高峰张延风张建明刘家鹏李猛胡登
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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