A pretreatment method for preparing high specific surface hierarchical porous activated carbon from cotton straw

Abstract

The invention belongs to the field of activated carbon and particularly relates to a pretreatment method for preparing high-specific surface-area multi-hole activated carbon with cotton stalks. The pretreatment method includes: 1), smashing the cotton stalks into particles and screening to remove impurities; 2), rinsing materials prior to dehydrating; 3), adding the materials into an alkalescent solution for dump leaching, rubbing the materials mechanically to divide the same into threads, extruding excess fluid and performing dump leaching once more; 4), placing the materials into a closed pressure vessel, feeding high-pressure steam 1.0-2.5MPa in atmospheric pressure for 5-20 minutes, releasing the materials and the steam prior to releasing pressure to normal pressure and allowing the materials to come out; 5), rinsing with deionized water and performing dehydrating; 6), performing uniform drying. By the arrangement, natural microchannel structure of the cotton stalks can be effectively utilized and expanded, the specific surface area is increased, quality raw materials are provided for low-cost subsequent preparation of high-specific surface-area multi-hole activated carbon process, usage of activating agents in the subsequent process is low, and the pretreatment method is simple in activating process, high in sustainability and suitable for scale production.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, in particular to a pretreatment method for preparing high specific surface hierarchical porous activated carbon with cotton straw. Background technique [0002] Activated carbon material is a new type of material system developed in the 20th century. As a non-metallic porous carbon material, its notable feature is that it has a regular arrangement, adjustable size, and highly developed pore structure, so it has a high specific surface area and a large adsorption capacity. It has a wide range of applications in many fields such as macromolecular catalysis, adsorption and separation, nanomaterial assembly, and biochemistry. At present, it also shows good performance in fuel cells, electrocatalysis, hydrogen storage, photonic crystals, electric double layer capacitors, and supercapacitors. application prospects. However, its high manufacturing cost greatly limits its developmen...

AI Technical Summary

Problems solved by technology

[0008] Biomass activated carbon materials are mainly biological straw, such as cotton straw, wheat straw, corn straw, etc., which generally need to be pretreated when preparing activated carbon as a precursor material. The current pretreatment method is usually to crush the biological straw to powder. Its unique natural micro-pore structure has not been fully utilized through technological means, so the existing biomass activated carbon preparation technology only solves the problem of the utilization of cotton straw, and does not make full use of the microscopic characteristics of the tissue structure of biomass materials. Biomass Micropore Structure and Micropore Surface Area