Method for preparing high specific surface area micron-scale spherical activated carbon from carboxymethyl cellulose

Abstract

The invention discloses a method for preparing high specific surface area micron-scale spherical activated carbon from carboxymethyl cellulose. The method is characterized by comprising the following steps: by taking carboxymethyl cellulose as a raw material, performing ultrasonic oscillation on carboxymethyl cellulose solutions of different concentrations, transferring into a sealed high-pressure reaction kettle that polytetrafluoroethylene is lined inside, and performing hydrothermal carbonization reaction while controlling the temperature and the time; and naturally cooling the reaction system to be the room temperature, and washing with distilled water and absolute ethyl alcohol, thereby obtaining precursor carbon spheres; putting a certain amount of the precursor carbon spheres into a tubular furnace, gradually heating in the presence of N2 while controlling the heating velocity, the activation temperature and the activation time, introducing N2 after the activation is completed, and naturally cooling to be the room temperature, thereby obtaining the micron-scale spherical activated carbon, wherein the specific surface area of the prepared micron-scale spherical activated carbon can be about 1000m<2> / g, and the average aperture of the prepared micron-scale spherical activated carbon is within 2-4nm. The method has the main characteristics that the carboxymethyl cellulose biomass material is low in price and rich in resource, the operation of hydrothermal carbonization equipment is simple, the process is green and environment-friendly, and the morphology, the particle size and the dispersity of a product can be controlled by conditioning and controlling the reaction conditions.

Description

Technical field: [0001] The invention relates to the field of carbon material preparation, in particular to a method for preparing micron-sized spherical activated carbon with high specific surface area from carboxymethyl cellulose. Background technique: [0002] Due to its regular spherical structure, good packing density, high specific surface area, and excellent electrical and thermal conductivity, carbon microspheres are widely used in the preparation of catalyst supports, electrode materials, templates, and composite materials. New carbon materials with different shapes and functions can be prepared by different reaction raw materials and preparation processes. Compared with traditional chemical raw materials, biomass-based carbon materials have attracted extensive attention from researchers because of their environmental protection and wide range of sources. [0003] Japanese patents 50-018879 and 55-113608 introduce a preparation method of spherical activated carbon,...

AI Technical Summary

Problems solved by technology

[0008] To sum up, most of the current methods for preparing spherical activated carbon use traditional chemical materials as precursors. Although the prepared carbon materials have a large specific surface area, the cost is high, the chemical activation process is intensive, and it is easy to corrode equipment and cause environmental pollution.

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