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A preparation method of ultra-thin graphene oxide film for molecular sieving

A molecular sieve and fossil technology, applied in the field of preparation of ultra-thin graphene oxide films, can solve problems such as inability to efficiently prepare ultra-thin graphene oxide films and the like

Active Publication Date: 2018-09-25
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

[0006] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a method for preparing an ultra-thin graphene oxide film for molecular sieving, to solve the problem that the ultra-thin graphene oxide film cannot be efficiently prepared in the prior art question

Method used

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  • A preparation method of ultra-thin graphene oxide film for molecular sieving
  • A preparation method of ultra-thin graphene oxide film for molecular sieving
  • A preparation method of ultra-thin graphene oxide film for molecular sieving

Examples

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Effect test

Embodiment 1

[0042] Example 1: Using a porous stainless steel sheet as the conductive film carrier, using 0.5mg / mL graphene oxide colloidal solution as the electrophoretic fluid, the electrode spacing is 10mm, the positive and negative potential difference is 5V, and the electrophoresis time is 100s, and the graphene oxide film is prepared by electrophoresis.

[0043] 24 mg of graphene oxide and 108 mg of 1,4-benzenediboronic acid (two active molecular compounds) were added together into 45 mL of methanol solvent (the ratio of graphene oxide and 1,4-benzenediboronic acid was 1:5), at 90 ° C, The solvothermal reaction was carried out for 60 h under the condition of 1000 rpm rotation. Centrifuge at 10,000 rpm for 20 minutes at room temperature to remove the supernatant; add a certain amount of methanol to the precipitate, use a sonicator to sonicate for 10 minutes, and perform centrifugation under the same conditions as before, and cycle three times. The obtained precipitate (graphene oxide ...

Embodiment 2

[0052] Example 2: Using a porous stainless steel sheet as the conductive film carrier, using 1 mg / mL graphene oxide colloidal solution as the electrophoretic fluid, the electrode spacing is 10 mm, the positive and negative potential difference is 5 V, and the electrophoresis time is 100 s, and the graphene oxide film is prepared by electrophoresis.

[0053] The difference from Example 1 is that 1 mg / mL graphene oxide colloid solution is used as the electrophoretic fluid, and the rest of the steps are the same as in Example 1. image 3 In the surface scanning electron microscope photo of the graphene oxide film prepared by this method, it can be seen that the surface of the porous stainless steel sheet has been covered by a layer of ultra-thin graphene oxide film.

[0054] The separation test results are shown in Table 2:

[0055] Various alcohol aqueous solution pervaporation separation test results of table 2 embodiment 2

[0056]

[0057] It can be seen from Table 2 that...

Embodiment 3

[0058] Example 3: Using a porous stainless steel sheet as the conductive film carrier, using 0.5 mg / mL graphene oxide colloidal solution as the electrophoretic solution, the electrode spacing is 3mm, the positive and negative potential difference is 5V, and the electrophoresis time is 100s, and the graphene oxide film is prepared by electrophoresis.

[0059] The difference from Example 1 is that the distance between the electrophoretic electrodes is 3 mm, and the rest of the steps are the same as in Example 1. Figure 4 In the surface scanning electron microscope photo of the graphene oxide film prepared by this method, it can be seen that the surface of the porous stainless steel sheet has been covered by a layer of ultra-thin graphene oxide film.

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Abstract

The invention provides a preparation method of an ultrathingraphene oxide thin film for molecular sieving. The graphene oxide thin film is prepared with an electrophoresis method. Specifically, charged graphene oxideprecursorsmove in an aqueous solution directionally, thereby being gathered on the surface of a conductive film carrier to form a film, and the film formed through electrophoresis is cured after electrophoresis is finished. Compared with a tradition method for preparing the graphene oxide thin film, the electrophoresis method has the advantages that the ultrathingraphene oxide thin film can be prepared effectively and rapidly, the mechanical strength of the prepared graphene oxide thin film is high, and the film thickness can be controlled in a range of 20-400 nm. Meanwhile, physicochemical properties of the graphene oxide film precursors can be changed through an electrochemical reaction in an electrophoresis process when the graphene oxidethin film is prepared with the electrophoresis method, so that filtering and sieving pore channels in the graphene oxide thin film are controlled, a sieving system is controlled, and gas separation, liquid separation and ion separation can be realized by the aid of the graphene oxidethin film.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a preparation method of an ultra-thin graphene oxide film used for molecular sieving. Background technique [0002] Compared with other separation methods, membrane separation technology has many advantages such as energy saving, environmental protection, high efficiency, no phase change in the separation process and simple operation. Due to the many advantages of membrane separation technology, it has been widely used in many fields such as chemical industry, food processing, metallurgy, and water treatment. [0003] Membrane separation technology uses the chemical potential difference of a certain component on both sides of the membrane as the driving force, and the membrane can achieve selective separation by the difference in affinity and mass transfer resistance of different components in the feed liquid. Membrane separation methods are divided into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D13/02C25D13/22
CPCC25D13/02C25D13/22
Inventor 曾高峰戚本郁何晓帆张延风李桂花孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI