Polyimide-Based Catalytic Cathodic Carbon Membrane Supporting Single Atom Catalyst and Its Application

A polyimide-based and polyimide precursor technology, applied to polyimide-based catalytic cathode carbon membranes loaded with single-atom catalysts and its application fields, can solve the problem that single-atom catalysts are prone to agglomeration and difficult to recycle for a long time , collection difficulties and other problems, to achieve the effect of solving the low utilization rate of metal atoms, reducing the resistance of electron transfer, and realizing electron transfer

Active Publication Date: 2022-05-13
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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Problems solved by technology

But it also faces a thorny problem. When the metal particles are reduced to the single-atom level, due to the sharp increase in the free energy of the metal surface, the synthesis of single-atom catalysts is prone to agglomeration.
Therefore, the stability and loading capacity of single-atom catalysts are still two major challenges to be solved in the development of single-atom catalysts.
In addition, there are few literature reports on the loading of single-atom catalysts on separation membranes. Most of the research basically focuses on the preparation of single-atom catalyst materials, and powder catalysts are prone to poor stability and easy to break down during water treatment. Problems such as loss, difficulty in collection, and difficulty in achieving long-term recycling

Method used

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  • Polyimide-Based Catalytic Cathodic Carbon Membrane Supporting Single Atom Catalyst and Its Application
  • Polyimide-Based Catalytic Cathodic Carbon Membrane Supporting Single Atom Catalyst and Its Application

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preparation example Construction

[0037] The preparation method comprises the following steps:

[0038] 1) Preparation of ZnM-BMOFs: the target metal M salt methanol solution and Zn 2+ Mix the salt methanol solution with the 2-methylimidazole organic ligand methanol solution, adjust the pH, mix and dissolve with ultrasound and stir, after drying for 4 hours, the precipitate is washed with methanol solution, and then dried at 70-80°C;

[0039] 2) Preparation of ZnM-BMOFs / carbon nanotubes / polyamic acid hybrid film: ultrasonically disperse the ZnM-BMOFs powder and carbon nanotube powder prepared in step 1) into N,N-dimethylacetamide solvent, Prepare solution A for later use; dissolve 4,4'-diaminodiphenyl ether in N,N-dimethylacetamide solvent, and stir until 4,4'-diaminodiphenyl ether is completely dissolved, and then add Add pyromellitic dianhydride to the solution several times to completely dissolve pyromellitic dianhydride to obtain prepolymer polyamic acid solution B; mix solution A and solution B evenly, s...

Embodiment 1

[0048] 1. Preparation of the target metal Co single-atom catalyst / carbon nanotube / polyimide-based catalytic carbon membrane:

[0049] 1) Take 1.86g of Zn(NO 3 ) 2 ·6H 2 O and 1.455g of Co(NO 3 ) 2 ·6H 2 Dissolve O in 50mL of methanol solution, shake to dissolve; dissolve 2.05g of 2-methylimidazole in 50mL of methanol solution, dissolve and mix well. Then add the prepared metal salt mixed solution into the organic ligand methanol solution, and ultrasonically dissolve it for 15 minutes, and stir for 12 hours; the obtained mixed solution is placed in an oven at 120 ° C for 4 hours, and the precipitate cooled to room temperature is centrifuged, and then used Wash with methanol for 3-5 times, and finally dry at 70°C for 8 hours to obtain the ZnCo-BMOFs material.

[0050] 2) Disperse 1g of ZnCo-BMOFs powder and 1g of carbon nanotube powder into 10mL of N,N-dimethylacetamide solvent, stir magnetically for 2h, and disperse ultrasonically for 2h to prepare solution A for later us...

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Abstract

The invention provides a polyimide-based catalytic cathode carbon membrane loaded with a single-atom catalyst and its application. Using the principle of MOF-based in-situ derivation of a single-atom catalyst, polyimide is used as the precursor of the carbon membrane, and the prepared Mix and disperse the MOF precursor and conductive nanomaterials in an organic solvent, then add the above solution into the polyamic acid solution, and scrape-coat the MOF polyamic acid hybrid film on a glass plate; finally, use the temperature programming method in the inert Carbonization is carried out in a gas atmosphere. During the carbonization process, the metal ions in the MOF are pyrolyzed in situ and reduced to single-atom catalysts. The polyamic acid is first converted into polyimide and then further forms a carbon film. The invention prepares a conductive cathode catalytic membrane with high mechanical properties, chemical corrosion resistance, high stability and high ORR activity. It is used in EMBR system, microbial fuel cell system, and electrocatalytic system, and is suitable for membrane treatment of high-concentration refractory organic industrial wastewater.

Description

technical field [0001] The invention belongs to the field of structure and application of high molecular polymer / single-atom catalyst functional composite material and the technical field of sewage purification and waste water resource utilization, and in particular relates to a single-atom-loaded catalyst suitable for membrane treatment of high-concentration refractory organic industrial wastewater A polyimide-based catalytic cathode carbon membrane provides a membrane electrode for improving the catalytic activity of a carbon-based microbial fuel cell and a preparation method thereof. Background technique [0002] Water is the source of all life, and it is also an indispensable and important resource for the development of the national economy. With the rapid development of my country's industrialization process, more and more organic compounds are widely used in human production or life, accompanied by a large number of toxic and harmful organic pollutants into the water,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/74B01J21/18C02F3/12C08J5/18C08L79/04C02F101/30
CPCC02F3/005C02F3/1268C08J5/18C08J2379/08C08J2487/00C02F2101/30Y02W10/10
Inventor 宋迪慧杨爽张立涛李红欣屈泽鹏刘合鑫安路阳尹健博
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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