Mesoporous carbon material high in specific surface area and rich in oxygen surface functional groups, and preparation method thereof

Abstract

The invention discloses a mesoporous carbon material high in specific surface area and rich in oxygen surface functional groups. The mesoporous carbon material has a specific surface area of 940-1365 m<2> / g, an average pore diameter of 3.1-3.8 nm, and a pore volume of 0.9-1.2 cc / g, and two or three of -COOH, -C-OH and -C=O are modified on the mesoporous carbon material. A preparation method of the mesoporous carbon material disclosed by the invention comprises the following steps of: heating a polysiloxane precursor and then enabling the polysiloxane precursor to perform a cross-linking reaction, then performing crushing, pyrolysis and ball-milling to obtain a porous carbon precursor; then performing chlorination etching on the porous carbon precursor by a method of deriving carbon from carbides, so as to obtain a mesoporous carbon material with Cl; finally performing aftertreatment by ammonia gas or hydrogen, so as to obtain a mesoporous carbon material without Cl. The mesoporous carbon material disclosed by the invention has the advantages of being low in raw material cost, simple and convenient in process steps, low in preparation temperature, good in product performance, and the like.

Description

technical field [0001] The invention relates to a carbon material and its preparation, in particular to a micro-mesoporous carbon material and its preparation method. Background technique [0002] Porous carbon materials not only have the characteristics of low density, high strength, good biocompatibility, chemical stability (non-oxidative environment), excellent electrical conductivity and strong processability of carbonaceous materials, but also have high specific surface area and pore volume. Porous properties such as large size and rich pore structure. Among them, one of the main applications of micro-mesoporous carbon materials is adsorption, and adsorption not only requires high specific surface area to enhance physical adsorption performance, but also often requires some surface functional groups to improve chemical adsorption capacity. [0003] At present, the methods used to prepare porous carbon mainly include activation method (including physical method and chem...

AI Technical Summary

Problems solved by technology

However, due to the thermal cracking of carbon precursors or the condensation of hydroxyl groups in the carbonization process, the loss of O and H, or the use of raw materials containing less (or no) O and H as carbon precursors, this makes the final porous carbon material It is difficult to obtain high specific surface area and surface functional groups rich in COOH, C-OH, C=O, etc. At this time, it is often necessary to perform subsequent activation treatment on porous carbon materials (such as physical CO 2 activation, chemical KOH activation), surface modification treatment (such as low-temperature air oxidation, pickling, etc.), in order to achieve high specific surface area and the simultaneous acquisition of oxygen-rich surface functional groups

However, the subsequent activation treatment operation or surface modification treatment operation will increase the difficulty of process operation, prolong the process and increase the cost, which is not conducive to the application and promotion of porous carbon materials

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