In-situ nitrogen-doped ultra large aperture mesoporous carbon material and preparation method thereof

Abstract

The invention discloses an in-situ nitrogen-doped ultra large aperture mesoporous carbon material and a preparation method thereof. The aperture is concentrated between 17.4 and 26.8nm, the BET specific surface area is 428-984 m<2> / g, the pore volume is 0.72-2.38 cm<3> / g, the nitrogen element content is 4.17-4.63wt%, and the doping form of nitrogen atoms is pyridine nitrogen, pyrrole nitrogen or quaternary ammonium nitrogen. According to the preparation method, nitrogen-containing biopolymer chitosan is used as a carbon source, tetraethoxysilane (TEOS) is used as a silicon source, commercial surfactant F127 is used as a structure-directing agent, deionized water is used as a main solvent, the chitosan is combined with the hydrolyzed tetraethoxysilane into a high-polymerization hybrid material by using a sol-gel method, the hybrid material is assembled with the structure-directing agent F127 into a mesoporous structure via hydrogen bonding, and the mesoporous carbon material is obtained after template removal. The method is simple, the raw materials are readily available, and the aperture size can be adjusted.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an in-situ nitrogen-doped ultra-large-aperture mesoporous carbon material, and also relates to a preparation method of the in-situ nitrogen-doped ultra-large-aperture mesoporous carbon material. Background technique [0002] Ultra-large pore diameter mesoporous (10-50nm) carbon materials are a hot spot in the scientific research of nanomaterials in recent years. They have extensive applications in biosensors, adsorption and separation of macromolecules, especially protein molecules, and targeted delivery of macromolecular drug carriers Application prospect. Due to the high requirements for the biocompatibility of carbon materials in these application fields, the required ultra-large pore mesoporous carbon materials should not only have large pore diameter, pore volume and specific surface area, but also be non-toxic, harmless, high Biocompatible materials should ha...

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Problems solved by technology

[0003] Chinese Patent Publication No. CN101153051A published on April 2, 2008 an invention titled "an ordered mesoporous material with super large pore size and its preparation method", which utilizes amphiphilic PEO- The b-PS triblock copolymer is used as a structure-directing agent, and the phenolic resin is used as a carbon precursor to induce self-assembly through solvent volatilization to prepare mesoporous carbon materials with a pore size between 10-100nm. The disadvantage is that PEO-b- PS tri-block copolymers need to be synthesized through multi-step organic reactions in the laboratory, which greatly limits the application and promotion of this method, and the hydrophilicity of the prepared carbon materials needs to be improved through post-processing

(TakahitoMitome, Porous structure and pore size control of mesoporous carbons using a combination of a soft-templating method and a solvent evaporation technique, Colloids and Surfaces A: Physicochem.Eng.Aspects 494(2016)180–185), although they successfully prepared ultra-large pore size Mesoporous carbon material, but the selected carbon source is still phenolic resin as announced in the above patent, so the whole reaction process is also carried out in an organic solvent, which cannot fundamentally meet the requirements of environmental friendliness in the preparation process and biomedical materials. Requirements for harmful residues, and the problem of hydrophilicity needs to be solved through post-treatment processes, which greatly limits its application in biosensors, adsorption and separation of bioactive molecules, and targeted delivery of macromolecular drug carriers.