Chemically-modified attapulgite-clay-based porous ceramic and preparation method thereof

Abstract

The invention relates to a chemically-modified attapulgite-clay-based porous ceramic and a preparation method thereof. The preparation method of the ceramic comprises the following specific steps thatfirstly, attapulgite clay is prepared into an attapulgite-clay-based porous ceramic by using organic foam; secondly, the attapulgite-clay-based porous ceramic is hydroxylated by using alkali; finally, the hydroxylated attapulgite-clay-based porous ceramic is chemically modified to obtain the chemically-modified attapulgite-clay-based porous ceramic. The ceramic has the advantages that the ceramichas a fixed shape, recycling is easy, the porosity is high, pores are communicated with one another, the distribution uniformity of the pores is high, the strength is high, the adsorption and complexation performance is excellent, the enrichment degree of waste liquid and waste gas is high, the ceramic can be recycled, and the cost is low; the ceramic can be widely applied to precise filtration and separation of various mediums, high-pressure gas exhaust, sound attenuation, electrolytic diaphragms, wastewater purification, bioceramics, ceramic separation membranes, ceramic sensors and other fields.

Description

technical field [0001] The invention relates to the field of preparation of ceramics, in particular to a preparation method of chemically modified attapulgite-based porous ceramics. Background technique [0002] Ceramics are materials and various products made of clay as the main raw material and various natural minerals through pulverization, mixing, molding and calcination. Porous ceramics have the advantages of high temperature resistance, high pressure, acid, alkali and organic medium corrosion resistance, good biological inertness, controllable pore structure and high opening porosity, long service life, good product regeneration performance, etc., and can be applied to various Precision filtration and separation of media, high-pressure gas exhaust silencer, gas distribution and electrolytic diaphragm and other fields. In order to further improve the performance of porous ceramics, the surface of porous ceramics can be modified, so that they can be used in the fields o...

AI Technical Summary

Problems solved by technology

Chinese patent CN104072090B prepared porous ceramics with binder and waste ceramics. This invention has the following disadvantages: ① No pore-forming agent, organic foam and other materials are added for porous treatment, and the binder and waste ceramics have no developed pores, so the material The porosity is very low and the adsorption performance is poor; ② Without calcination, the strength of the material is limited; ③ Without modification, ceramics cannot be used in special fields such as biocompatibility, selective adsorption, functional separation, sensors, etc.

This invention has the following disadvantages: 1. the porosity of the porous ceramics prepared by the pore-forming agent is not high, the uniformity of the pore distribution is poor, and the pores of the silicate or oxide ceramics are not developed, so the performance of the porous ceramics obtained is limited; 2. without modification Ceramics cannot be used in special fields such as biocompatibility, selective adsorption, functional separation, sensors, etc.

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