Ultrafine-size metal-PAN-based carbon fiber and preparation method thereof

Abstract

The invention relates to an ultrafine-size metal-PAN-based carbon fiber and a preparation method thereof. The preparation method comprises the steps that amine-oxime modified polyacrylonitrile fibersand a metal salt are subjected to a self-assembling reaction under a hydrothermal condition and then calcined under a reducing atmosphere to obtain ultrafine-size metal-PAN-based carbon fibers. The prepared ultrafine-size metal-PAN-based carbon fibers are composed of PAN-based carbon fibers, carbon nanotubes and metal nanoparticles with the surfaces coated with graphite layers; the carbon nanotubes are dispersed on the surfaces of the PAN-based carbon fibers, and the carbon nanotubes are staggered with each other to form a nano-mesoscopic-sized pore structure; and the metal nanoparticles of the surfaces coated with the graphite layers are limited in the ends of the carbon nanotubes, the metal nanoparticles are in a monodisperse state, are uniformly dispersed and are uniform in size, and the average particle size of the metal nanoparticle ranges from 5 nm to 20 nm. The ultrafine-size metal-PAN-based carbon fiber has strong adsorption performance, and the limiting effect of the carbon nanotubes on the metal nanoparticles avoids agglomeration among the metal nanoparticles.

Description

technical field [0001] The invention belongs to the technical field of inorganic nano synthesis, and relates to an ultrafine size metal-PAN-based carbon fiber and a preparation method thereof. Background technique [0002] Carbon fiber (carbon fiber) is generally converted from organic fibers through a series of heat treatments. It is a special fiber composed of carbon elements. Carbon fiber also takes into account the inherent advantages of carbon materials such as low density, light weight, good electrical conductivity, corrosion resistance, and good compatibility with other materials, as well as the good flexibility and designability of fiber materials. advantage. Therefore, carbon fiber is often regarded as an ideal carrier material and is widely used in the preparation of composite materials. [0003] Patent (CN109295442A) discloses a method for colloidal copper activated carbon fiber and one-step preparation of electroless copper-nickel double metal layer. The core s...

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Problems solved by technology

The patent (CN111005047A) discloses a method for preparing a uniform electroplated copper layer on carbon fibers. The preparation process uses electroplating technology to uniformly load micron-sized copper particles on the surface of carbon fibers, but the uniformity within the control range is poor and dense. high degree

Patent (CN110970628A) discloses a nano-carbon fiber and metal composite electrode and its application. The composite material is obtained by electrospinning in one step. Although the obtained metal nanoparticles are small in size (20nm), the particle dispersion is poor and cannot be controlled.

Therefore, the current problem in the preparation of metal / carbon fiber hybrid materials is that it is difficult to prepare metal / carbon fiber hybrid materials with small metal particle size, uniform size and uniform dispersion.

However, in the above studies, in order to increase the adsorption capacity of metal ions, as many amidoxime groups as possible were grafted on the surface of carbon materials to increase the adsorption sites of metal ions, so the distribution of metal ions was relatively dense. Agglomeration easily occurs during the preparation of metal elemental particles by ion reduction

In addition, in the process of reusing the adsorbed metal ions, the electric reduction or thermal reduction method with relatively extensive condition control is often used, and the obtained metal particles are mostly in the micron size, or obviously agglomerated, and the dispersion degree It is also poor, which greatly affects the catalytic performance

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