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Carbon nano-sieve based on pearl layer, and preparation method thereof

A technology of carbon nano and nacre, which is applied in the direction of nano carbon, can solve the problems of uneven distribution of carbon nano sieve pore size, cumbersome preparation of templates, loss of carbon, etc., and achieve clever design, low operating cost and high conductivity. Effect

Active Publication Date: 2020-04-28
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strategy of direct carbonization of layered organic-inorganic composites is very attractive, but it still suffers from tedious, time-consuming and inefficient template preparation.
Chemical etching usually results in uneven pore size distribution of carbon nanosieves, and the etching process loses part of the carbon, resulting in lower yields

Method used

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  • Carbon nano-sieve based on pearl layer, and preparation method thereof
  • Carbon nano-sieve based on pearl layer, and preparation method thereof
  • Carbon nano-sieve based on pearl layer, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0038] A method for preparing a carbon nanosieve based on nacre, comprising the steps of:

[0039] 1) Wash Hepu mother-of-pearl shells with plenty of water, and use a brush to remove surface deposits. Then use a grinding wheel to remove the shell layer and the prism layer to obtain the nacre layer.

[0040] 2) Soak the obtained pearl layer in 0.5M sulfuric acid aqueous solution, and soak for 6 days at 35°C to fully dissolve the inorganic matter, and then use clean water to filter and wash the obtained organic matter for several times (the filter membrane pore size is 450nm), until the upper layer is medium properties, suction filtered to remove excess water for later use.

[0041] 3) The above-mentioned organic fraction was redispersed in tert-butanol, ultrasonicated at 80KHz, 100W for 60min, the resulting dispersion was frozen at -26°C, and freeze-dried at -10°C.

[0042] 4) The organic powder obtained above was heated to 500° C. under an atmosphere protected by argon (gas ...

Embodiment 2

[0045] A method for preparing a carbon nanosieve based on nacre, comprising the steps of:

[0046] 1) Wash the abalone shell with plenty of water to remove the sediment on the surface. Then, the surface layer and the prism layer of the abalone shell are polished with polishing grinding head, grinding wheel and wool felt successively.

[0047] 2) Soak the obtained nacre in 1M aqueous hydrochloric acid solution for 5 days at 25°C to fully dissolve the inorganic matter, then use clean water at 5000 rpm and 10 min to centrifuge and wash the obtained organic matter several times until the supernatant is neutral. spare.

[0048] 3) The above-mentioned organic fraction was redispersed in pure water, ultrasonicated at 45KHz, 150W for 30min, and the resulting dispersion was frozen at -176°C and freeze-dried at -56°C.

[0049] 4) Heat the organic matter powder obtained in the previous step to 700° C. under a nitrogen-protected atmosphere (nitrogen flow rate: 100 mL / min, heating rate: ...

Embodiment 3

[0052] A method for preparing a carbon nanosieve based on nacre, comprising the steps of:

[0053] 1) Wash Hepu mother-of-pearl shells with plenty of water, and use a brush to remove surface deposits. Then use a grinding wheel to grind out the case layer and prism layer to obtain the pearl layer.

[0054] 2) Soak the obtained pearl layer in 3M acetic acid, soak for 8 days at 45°C to fully dissolve the inorganic matter, then use clear water to filter and wash the obtained organic matter several times (the filter membrane pore size is 220nm), until the upper layer is neutral, spare.

[0055] 3) The above-mentioned organic fraction was redispersed in dimethyl sulfoxide, ultrasonicated at 45K Hz, 200W for 45min, the resulting dispersion was frozen at -20°C, and freeze-dried at -5°C.

[0056] 4) The organic powder obtained above was heated to 800° C. under a helium-protected atmosphere (gas flow rate: 80 mL / min, heating rate: 2° C. / min). The obtained sample was soaked in 1M hydr...

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Abstract

The invention relates to a preparation method of a carbon nano-sieve material, particularly to a carbon nano-sieve based on a pearl layer, and a preparation method thereof. The preparation method comprises the following steps: obtaining a pearl layer from aquatic mollusc shells, treating with an acid solution to obtain organic matters in the pearl layer, cleaning, dispersing in a solvent, ultrasonically stripping to form organic nanosheets, and carbonizing to obtain the carbon nano-sieve. The two-dimensional carbon nano-sieve prepared by the method has the advantages of large specific surfacearea, hierarchical pore channel structure, high conductivity, solvent dispersibility and the like, and can be widely used as an electrode material, an adsorption material, a catalyst, a catalyst carrier, a hydrogen storage material, an electro-adsorption desalting electrode material and the like. The method for preparing the two-dimensional carbon nano-sieve is simple to operate, low in cost, convenient for industrial production and beneficial to relieving aquatic product solid waste pollution.

Description

technical field [0001] The invention relates to a preparation method of a carbon nano-sieve material, in particular to a nacre-based carbon nano-sieve and a preparation method thereof. Background technique [0002] How to prepare low-dimensional carbon nanomaterials on a large scale with green and efficient methods has always been a technical problem faced by materials science and nanotechnology. Especially carbon nanosieve (a two-dimensional carbon nanomaterial with in-plane through holes), which has high specific surface area and super large porosity, has shown great potential in many fields such as catalysis, separation, sensing, energy conversion and storage. potential application value. For example, the graphene carbon nanosieve (a kind of carbon nanosieve) that has attracted much attention in recent years, its common preparation techniques include mask photolithography, oxidant or catalyst local oxidation method, etc. (Carbon, 2015,86:197-206 ). Besides, graphene na...

Claims

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Application Information

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IPC IPC(8): C01B32/15
CPCC01B32/15
Inventor 李朝旭李明杰韩笑
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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