The invention discloses a preparation method of a gap-variable adsorption material taking porous
ceramic as a matrix, and belongs to the field of
ceramic adsorption materials. Porous
ceramic is used as a matrix, a
phase change layer and a heat-resistant outer
coating film are formed on the surface of the matrix, and the heat-resistant outer
coating film with a high
melting point wraps the outer side of the
phase change layer with a
low melting point, thereby manufacturing the creative adsorption material having the gap-variable function. When a
heat flow (hot gas or hot water) is used for
backwashing the novel adsorption material, the
phase change layer is heated and melted and is coated between the porous ceramic and the heat-resistant outer
coating film in a fluid form, so that the heat-resistant outer coating film generates a
continuous dynamic fluctuation process under the washing force of the
heat flow; that is, the size and the shape of pores are changed, through the dynamic fluctuation process of the heat-resistant outer coating film, the heat-resistant outer coating film is more fully contacted with a
heat flow, and meanwhile, loosening and falling of impurities on the surface of the heat-resistant outer coating film are also promoted, so that a high-efficiency and high-effect
backwashing process is realized.