Preparing method and application of novel compound boron nitride adsorbing material

Abstract

The invention provides a preparing method of a novel compound porous boron nitride material which has a high adsorption capacity for heavy metal and fine particulate matter in high-temperature flue gas. The preparing method is environmentally friendly and can achieve recycling. The preparing method comprises three synthesis steps that 1, melamine (a nitrogen source), boric acid (a nitrogen source)and an additive are utilized for synthesizing a precursor of porous boron nitride; 2, the compound precursor obtained in step 1 and a pore-forming agent are doped and mixed under protective atmosphere, and high-temperature thermal cracking is conducted; 3, an obtained cracking product is put into a solution containing a surfactant for washing and drying to obtain the novel compound boron nitrideadsorbing material with a high specific surface area and a high activity. By means of the method, the defect that an existing adsorbent cannot be utilized under high-temperature and special extreme conditions is overcome, and the preparing method has a good application prospect in the field of high-temperature adsorption.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a synthesis method of a novel composite boron nitride adsorption material used for adsorbing heavy metals and fine particles in high-temperature flue gas. Background technique [0002] The three common crystal structures of boron nitride are hexagonal boron nitride (h-BN), wurtzite boron nitride (w-BN), and cubic boron nitride (c-BN). The novel composite porous boron nitride in the present invention is exactly hexagonal boron nitride. Porous boron nitride is a new type of material with high specific surface area, stable chemical properties, high temperature resistance and other excellent characteristics, and the B-N bond has a local polarity that C-C bonds do not have, so that it can be used as a stable material under high temperature or extreme conditions. Highly efficient adsorbent material used. [0003] In recent years, many scholars have found that...

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Problems solved by technology

[0010] The method adopts three-step synthesis: the first step is to synthesize the precursor of porous boron nitride with melamine (nitrogen source), boric acid (nitrogen source) and additives; the second step is to combine the composite precursor obtained in the first step with the The porogen is doped and mixed under a protective atmosphere, and pyrolyzed at high temperature; in the third step, the obtained cracked product is put into a solution containing a surfactant for washing and drying to obtain a new composite boron nitride adsorption material with high specific surface area and high activity , the adsorbent prepared by the above method overcomes the defect that the existing adsorbent cannot be used under high temperature and special extreme conditions, and has a good application prospect in the field of high temperature adsorption

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