Method for preparing super-long multi-walled carbon nanotube from biomass through two-step microwave treatment

A technology of multi-walled carbon nanotubes and microwave treatment, which is applied in the direction of multi-walled carbon nanotubes, carbon nanotubes, nanocarbons, etc., can solve the complex preparation process, many structural defects of carbon nanotubes, and the difficulty of separating catalysts and carbon nanotubes and other problems, to achieve the effect of low cost and simple preparation process

Active Publication Date: 2020-12-04
UNIV OF SCI & TECH LIAONING
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing ultra-long multi-walled carbon nanotubes from biomass through two-step microwave treatment, which solves the problem of using catalysts in the prior art, and the separation of catalysts and carbon nanotubes is difficult, and there are many structural defect...

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  • Method for preparing super-long multi-walled carbon nanotube from biomass through two-step microwave treatment
  • Method for preparing super-long multi-walled carbon nanotube from biomass through two-step microwave treatment
  • Method for preparing super-long multi-walled carbon nanotube from biomass through two-step microwave treatment

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention, and are all used to explain the content of the present invention within the scope of reasonable changes.

[0029] The process flow diagram for preparing ultra-long carbon nanotubes with Malaysian palm kernel shell (PKS) biomass is shown in 1, figure 2 It is the structure diagram of microwave equipment.

[0030] (1) Separation of cellulose samples from biomass by chemical pretreatment

[0031] Put the PKS sample with a particle size of 150 μm to 280 μm in a vacuum drying oven, and dry it at 105 ° C for 12 h to remove moisture; add 250 ml of NaOH (0.5 mol / L) to 10 g of the dried PKS sample, stir cont...

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Abstract

The invention discloses a method for preparing a super-long multi-walled carbon nanotube from biomass through two-step microwave treatment. The method comprises the following steps: (1) separating a cellulose sample from the biomass through a chemical pretreatment method; (2) carrying out low-temperature microwave pyrolysis on the cellulose sample to generate a biochar sample containing carbon nanotubes; and (3) carrying out high-temperature microwave pyrolysis on the biochar sample to prepare the super-long multi-walled carbon nanotube. According to the method, a thin metal (Ni, Mo, Fe, Co and the like) substrate does not need to be used, various hydrocarbons (ethane, methane, acetylene, xylene or a mixture thereof and the like) are replaced by biomass, and the super-long multi-walled carbon nanotube with high graphene crystal content (about 0.97), the length of more than or equal to 1cm and the diameter of 200-400nm is prepared by only adopting microwave heating. The method solves the problems of complex process, high cost, short carbon nanotubes, many defects and the like in the prior art for preparing the super-long multi-walled carbon nanotubes.

Description

technical field [0001] The invention uses microwaves to directly convert biomass into ultra-long multi-walled carbon nanotubes, and relates to the technical field of efficient and clean utilization of biomass resources. Background technique [0002] Carbon nanotubes are hollow "microtubes" formed by winding hexagonal grids similar to graphite structures, and are divided into single-layer tubes and multi-walled tubes. The multi-wall tube is composed of several coaxial cylindrical surfaces with a layer spacing of about 0.34 nanometers. The diameter of ordinary carbon nanotubes ranges from tens of nanometers to hundreds of nanometers, and the length is in microns, while the length of ultra-long carbon nanotubes can reach centimeters or even decimeters. Carbon nanotubes and their composite materials are widely used in many fields such as field emission, multifunctional composite materials, catalyst materials, hydrogen storage materials, sensors, biomedicine, adsorption material...

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Application Information

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IPC IPC(8): C01B32/16
CPCC01B32/16C01B2202/34C01B2202/36C01B2202/06
Inventor 窦金孝俏珍珠·欧姆田露阿加西·塔玛赛比
Owner UNIV OF SCI & TECH LIAONING
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