Multi-layer macropore-mesopore-micropore polymer-derived ceramic adsorption material and preparation method thereof

Abstract

The invention provides a preparation method of a multi-layer macropore-mesopore-micropore polymer-derived ceramic adsorption material. The preparation method comprises the following steps: preparing solid polysiloxane; grinding and screening wood chips and rice husks, performing ball milling, and taking out and drying powder; performing ball milling on solid polysiloxane, wood powder and rice huskpowder uniformly after mixing; placing a uniform mixture in a tubular furnace, sintering the mixture at high temperature under the protection of inert gas, and performing heat preservation and cooling with the furnace; performing acid etching on the obtained porous SiOC ceramic powder with a hydrofluoric acid solution, washing a product with water to be neutral and then performing drying to obtain the macropore-mesopore-micropore polymer-derived ceramic adsorption material. Multi-layer porous polymer-derived ceramic with high specific surface area can be synthesized by in-situ reaction and has abundant micropores and mesopores, and larger storage space and evacuation channels can be formed; rapid transport rate of reactants and products in the sewage treatment process is increased as a result of enough large pores, and larger adsorption space and transport channels can be formed.

Description

technical field [0001] The invention relates to the technical field of porous ceramic materials, in particular to a multi-level macroporous-mesoporous-microporous polymer derived ceramic adsorption material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the dye industry, dye wastewater has the characteristics of complex components, high concentration of organic matter, difficult decolorization, many refractory substances, and strong toxicity, which seriously pollutes the water environment and endangers human health. Porous ceramics are widely used in the field of sewage purification because of their light weight, high temperature resistance, thermal shock resistance, high strength, high chemical stability and high specific surface area, which are of great significance to solve the shortage of water resources and build a harmonious environment. The traditional porous ceramics have the disadvantages of low adsorpt...

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Problems solved by technology

The porous PCDs synthesized by the above methods all show the disadvantages of single distribution of pore size, narrow pore size distribution and low specific surface area, which limit their application in the field of sewage treatment.

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