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Method for synthesizing composite material of organic - inorganic bentonite

A technology of inorganic bentonite and composite materials, applied in the direction of inorganic chemistry, chemical instruments and methods, silicon compounds, etc., can solve the problems of easy falling off, weak action force, low organic carbon content, etc., and overcome the problems of easy fall off and strong action force Effect

Inactive Publication Date: 2007-07-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surfactant-modified organic bentonite has the following problems when used as an adsorbent: (1) The interlayer of bentonite is occupied by modifier molecules, the specific surface area and pore volume decrease sharply, and the adsorption effect on low-concentration adsorbates is poor and in the gas phase The adsorption speed is slow during adsorption, and the mass transfer resistance is large when adsorbing gas; (2) The organic modifier is usually loaded on the bentonite by cation exchange or physical adsorption, and the force is weak, and it is easy to absorb organic matter in water or in the regeneration process. In addition, the thermal stability depends on the decomposition temperature of the modified surfactant, and the surfactants suitable for synthesizing organobentonite are not high in thermal stability, so the thermal stability is poor (<250°C), which makes regeneration difficult
The problem with silanized organic bentonite is that the reactive hydroxyl groups in the structure of bentonite are mainly located on the outer surface, and most of the hydroxyl groups are wrapped in the silicon-oxygen tetrahedron. The aluminum hydroxyl groups are non-reactive hydroxyl groups, so the result of direct silanization of bentonite is organic carbon The content is low, and the silane group is mostly located on the surface, which has little effect on the layer, far inferior to the organic bentonite modified by cationic surfactant
It not only has the advantages of traditional organic bentonite, but also overcomes the shortcomings of its small specific surface area and pore volume and weak adsorption capacity for low-concentration adsorbates to a certain extent.
At the same time, it was also found that after bentonite was modified by polymeric metal ion pillars, the CEC dropped sharply, and some cationic surfactants entered the interlayer through physical adsorption rather than cation exchange, so the surfactant loading decreased and it was easy to fall off, and it still has not been solved. The problem of low thermal stability
[0007] Although the thermal stability of conventional inorganic pillared bentonite is better than that of organic bentonite, it obviously does not have the ability of organic bentonite to increase the adsorption capacity through high organic carbon content. However, the thermal stability is still not improved compared with organic bentonite, and the problem that the surfactant is easy to fall off is also difficult to overcome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, under the conditions of continuous stirring and a temperature of 50°C, within 2 hours, a sodium carbonate aqueous solution with a concentration of 2 mol / L was added dropwise to 3 times the volume of 0.1 mol / L AlCl 3 ·6H 2 O aqueous solution, continued to stir for 3 hours after the dropwise addition was completed, then stopped heating, left to age for 36 hours, and obtained a pillar liquid.

[0023] Heat the pillar liquid to 50°C and keep the temperature constant. According to the ratio of the mass of bentonite to the volume ratio of pillar liquid of 80g / L, under the condition of stirring, the calcium-based bentonite with montmorillonite content of 100% is gradually mixed within 1 hour. Disperse into the pillar liquid, continue to stir for 4 hours after the dispersion is completed, cool to room temperature, and stand for 36 hours; filter and separate, the solid product is washed four times with water equal to the volume of the pillar liquid and filtered to sep...

Embodiment 2

[0025] Example 2, under the conditions of continuous stirring and a temperature of 80 ° C, within 5 hours, the concentration of 0.5 mol / L sodium carbonate aqueous solution was added dropwise to 1 volume of 1 mol / L AlCl 3 ·6H 2 O aqueous solution, continued to stir for 6 hours after the dropwise addition, then stopped heating, left to age for 10 hours, and obtained a pillar liquid.

[0026] Heating the pillaring liquid to 80°C and keeping the temperature constant, according to the ratio of bentonite mass to pillaring liquid volume ratio of 20g / L, under stirring conditions, within 0.5 hours, the calcium-based bentonite with a montmorillonite content of 65% was gradually Disperse into the pillar liquid, continue to stir for 5 hours after the dispersion is completed, cool to room temperature, and stand for 12 hours; filter and separate, the solid product is washed four times with water equal to the volume of the pillar liquid and filtered to separate, and the solid product after f...

Embodiment 3

[0028] Example 3, under the conditions of continuous stirring and a temperature of 60 ° C, within 5 hours, the concentration of 0.9 mol / L sodium carbonate aqueous solution was added dropwise to 3 times the volume of 1 mol / L AlCl 3 ·6H 2 O aqueous solution, continued to stir for 6 hours after the dropwise addition, then stopped heating, left to age for 10 hours, and obtained a pillar liquid.

[0029] Heating the pillaring liquid to 60°C and keeping the temperature constant, according to the ratio of the mass of bentonite to the volume ratio of the pillaring liquid of 20g / L, under the condition of stirring, within 0.5 hours, the sodium bentonite with a montmorillonite content of 65% was gradually Disperse into the pillar liquid, continue to stir for 5 hours after the dispersion is completed, cool to room temperature, and stand for 12 hours; filter and separate, the solid product is washed four times with water equal to the volume of the pillar liquid and filtered to separate, an...

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Abstract

This invention discloses a method for synthesizing organic-inorganic bentonite composite. The method comprises: utilizing bentonite as the main material, performing inorganic modification through cation-exchange reaction by using hydroxyl aluminum aqueous solution, torrefying to obtain hydroxyl-containing aluminum-pillared bentonite with high porosity and high specific surface area, and reacting between the hydroxyls and silylation agent to graft silane groups onto aluminum-pillared bentonite and obtain organic-inorganic bentonite composite. The organic-inorganic bentonite composite has both the advantages of inorganic pillared bentonite such as high porosity and high specific surface area, and those of organic bentonite such as high organic carbon content and high hydrophobicity thus can be used to treat organic waste gases and wastewater with a good effect by surface adsorption as well as distribution.

Description

technical field [0001] The invention belongs to the field of clay mineral processing and utilization, and specifically relates to a method for synthesizing an organic-inorganic bentonite composite material, especially an organic-inorganic bentonite composite material that can be used in the fields of organic waste gas and wastewater adsorption treatment through inorganic and organic modification. and its preparation method. Background technique [0002] Bentonite is a typical 2:1 layered clay mineral composed of montmorillonite as the main mineral, and is one of the most widely used non-metallic minerals. Bentonite has good properties such as water absorption, cohesiveness, adsorption, catalytic activity, thixotropy, suspension, plasticity, lubricity and cation exchange, so it can be used as a binder, absorbent, adsorbent, filling Agents, catalysts, thixotropic agents, flocculants, detergents, stabilizers and thickeners, etc., are widely used in metallurgy, machinery, chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44
Inventor 朱利中田森林
Owner ZHEJIANG UNIV
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