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Preparation method of kaolin-based mesoporous silica material

A kaolin-based mesoporous technology, applied in the field of mesoporous materials, can solve the problem of low specific surface area and achieve the effects of simple production process, wide application prospects and low cost

Inactive Publication Date: 2015-04-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Obviously, the kaolin-based porous silica materials reported in the literature are mostly micropores (pore diameter2 / g), far inferior to the specific surface area prepared by the template method can reach 1000m 2 / g of mesoporous material

Method used

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  • Preparation method of kaolin-based mesoporous silica material
  • Preparation method of kaolin-based mesoporous silica material

Examples

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Embodiment 1

[0029] A preparation method for a kaolin-based mesoporous silicon oxide material, comprising the steps of:

[0030] (1) Calcination activation: place the kaolin in the calcination equipment and calcine it at 850°C for 2 hours, then take it out after cooling the equipment to obtain amorphous metakaolin;

[0031] (2) Hydrothermal alkali activation: Mix metakaolin obtained in step (1) with 4mol / L sodium hydroxide solution at a ratio of 1kg:20L, stir and react at 80°C for 0.5h, then filter and use Wash the obtained solid product with ionic water to neutrality, and then dry it at 110°C to remove water to obtain metakaolin after alkali activation (hydrothermal alkali activation);

[0032] (3) Acid etching: mix the alkali-activated metakaolin obtained in step (2) with 5mol / L HCl solution at a ratio of 1kg:20L, stir and react for 6h at 100°C, then filter and use The obtained solid product was washed with deionized water to neutrality, and then dried at 110° C. to remove water to obta...

Embodiment 2

[0035] A preparation method for a kaolin-based mesoporous silicon oxide material, comprising the steps of:

[0036] (1) Calcination activation: place kaolin in a calcination equipment and calcine at 600°C for 12 hours, then sample directly at high temperature to obtain amorphous metakaolin;

[0037] (2) Hydrothermal alkali activation: Mix the metakaolin obtained in step (1) with 1mol / L sodium hydroxide solution at a ratio of 1kg:50L, stir and react at 70°C for 12h, then centrifuge and deionize Wash the obtained solid product with water to neutrality, and then dry it at 110°C to remove water to obtain alkali-activated metakaolin;

[0038] (3) Acid etching: the alkali-activated metakaolin obtained in step (2) and 1mol / L of H 2 SO 4 The solution was mixed at a ratio of 1kg:50L, stirred and reacted at 40°C for 1h, then filtered and washed with deionized water until the solid product was neutral, and then dried at 110°C to remove water to obtain kaolin prepared by the template-free...

Embodiment 3

[0041] A preparation method for a kaolin-based mesoporous silicon oxide material, comprising the steps of:

[0042] (1) Calcination activation: place kaolin in a calcination equipment and calcine at 950°C for 0.5h, then take samples directly at high temperature to obtain amorphous metakaolin;

[0043] (2) Hydrothermal alkali activation: Mix the metakaolin obtained in step (1) with 9mol / L sodium hydroxide solution in a ratio of 1kg:4L and place it in an alkali-resistant container, stir and react at 80°C for 0.5 h, then filter and wash the obtained solid product with deionized water to neutrality, then dry at 110°C to remove moisture, and obtain metakaolin after alkali activation;

[0044] (3) Acid etching: the alkali-activated metakaolin obtained in step (2) was mixed with 2mol / L HNO 3 Mix with a mixed solution of 1mol / L HCl at a ratio of 1kg:4L, stir and react at 60°C for 10h, then filter and wash the obtained solid product with deionized water until neutral, and then dry at ...

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Abstract

The invention relates to the field of mesoporous materials, and in particular relates to a process for preparing a kaolin-based mesoporous silica material by employing a template-free method. A preparation method of the kaolin-based mesoporous silica material is characterized by comprising the following steps: (1) calcinations and activation, namely calcining and activating kaolin to obtain metakaolin; (2) hydrothermal alkali activation, namely activating the metakaolin in a hot solution containing OH<-> and Na<+>; and (3) acid etching, namely etching the metakaolin which is subjected to hydrothermal alkali activation in an acid solution to obtain the kaolin-based mesoporous silica material. The method is low in production cost; and the obtained kaolin-based mesoporous silica material has high specific surface area.

Description

technical field [0001] The invention relates to the field of mesoporous materials, in particular to a process for preparing kaolin-based mesoporous silicon oxide materials by a template-free method. Background technique [0002] Due to its excellent pore size distribution (2-50nm) and large specific surface area, mesoporous materials have been widely used in many aspects such as adsorption, separation, catalysis, drug embedding and delivery. [0003] At present, the preparation of mesoporous materials mainly adopts the template method. The template method refers to the use of surfactants (soft templates) or some mesoporous materials (hard templates) as pore-forming agents or skeleton structures and chemical raw materials to form intermediates, and then obtain mesoporous structures by removing template components. However, due to the use of expensive template agents or template materials and chemical raw materials, the cost of mesoporous materials prepared by the template me...

Claims

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Application Information

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IPC IPC(8): C04B38/04
Inventor 舒杼周俊李天天于冬雪陈云王焰新袁曦明
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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