Preparation method of calcium silicate porous ceramic membrane with adjustable pore shape

Abstract

The invention discloses a preparation method of a calcium silicate porous ceramic membrane with an adjustable pore shape. The method comprises the steps that carbon substances are uniformly dispersedin absolute ethanol to obtain the suspension of carbon; calcium nitrate is dissolved in deionized water, and tetraethoxysilane is dissolved in the absolute ethanol to be added to a calcium nitrate solution dropwisely to be uniformly mixed; the carbon suspension is added to a mixed solution and uniformly dispersed through ultrasound; the pH value is adjusted to acide, a polyethylene glycol solution(PEG) with certain concentration is slowly added and stirred to be sol; xerogel is obtained after curing and drying are conducted; the xerogel is ground into powder to be molded through mold pressing, heat preserving is conducted, organic matters are removed, isostatic pressing is conducted after the xerogel is cooled and placed into an isostatic press, sintering is conducted, and the calcium silicate porous ceramic membrane can be obtained. The calcium silicate porous ceramic membrane prepared by means of the method has the advantages that the porosity distribution is uniform, the morphologyof holes is controllable, the pore diameter is fine, the bending strength is high, and the calcium silicate porous ceramic membrane has significant application prospects in the field of sewage filtration, air purifying and the like.

Description

Technical field [0001] The invention relates to a method for preparing a porous material, in particular to a method for preparing a calcium silicate porous ceramic membrane with adjustable pore shape, and belongs to the technical field of materials science. Background technique [0002] Porous ceramics is a new type of material that has received extensive attention in recent years. Because of its unique pore structure, it can achieve a variety of functional properties, so it is also called pore functional material. Porous ceramics not only have excellent stability and high temperature corrosion resistance, but also have the advantages of large specific surface area, high porosity, high permeability, low electrical conductivity, etc., and can be used as filter materials, catalyst carriers, and thermal insulation. Thermal materials, biological functional materials, etc., have been widely used in many fields such as chemical industry, energy, metallurgy, biomedicine, environmental p...

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Problems solved by technology

[0003] At present, the pore size of porous ceramics is generally around 3-5 μm, and it is difficult to make the pore size smaller. In order to obtain a better filtering effect, the pore size must be made smaller or even reach the nanometer level

Calcium silicate is a material with excellent biological activity and dielectric properties, and has been applied to fields such as biomedicine and dielectric materials; as early as Pan (J.Mech.Behavior.Biomed.Mater.2016,55: 120-126) and others have shown that the structure of calcium silicate obtained by high temperature sintering is not dense, Lin Kaili (Journal of Inorganic Materials, 2005, 20:962) and others have successfully prepared calcium silicate biomicrospheres and used them In vitro activity and degradability research, but this porous ceramic has a large pore size, between 200 and 500 μm; there is a latest patent (Li Minghui, China Metrology Institute, ZL201610014543.8, 2018-4-20), using solid-phase method can The preparation of porous calcium silicate ceramics with a pore size of less than 100nm has greatly promoted the development of porous calcium silicate ceramics; however, porous calcium silicate membranes with smaller pore sizes are rarely reported; in addition, by adding different carbon substances to The study of adjusting the shape of the pores to obtain calcium silicate porous ceramic membranes with different pore types has not been reported

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