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Modified meerschaum, preparation method and application thereof

A sepiolite and modification technology, applied in the field of modified sepiolite and its preparation, can solve the problems of low CODcr removal rate, low ozone yield and low utilization rate of papermaking wastewater, and achieve good catalytic oxidation effect , The effect of improving the utilization rate of ozone and reducing the loss of mechanical strength

Inactive Publication Date: 2015-09-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high selectivity of the oxidation activity of ozone molecules, it is difficult to completely mineralize the refractory macromolecular organic matter in papermaking wastewater into CO in the process of water treatment. 2 and H 2 o
Moreover, the yield of ozone is not high, and the low utilization rate makes the cost of ozone oxidation treatment higher
Furthermore, the single ozone oxidation process still has the problem of low CODcr removal rate for papermaking wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of modified sepiolite of the present embodiment, concrete preparation steps are as follows:

[0037] (1) Purification: Soak the natural sepiolite ore powder in distilled water with a solid-to-liquid ratio of 1:5, stir, stand still, and layer. 80 mesh;

[0038] (2) Acid activation: Put the sepiolite purified in step (1) into the HCl solution with a concentration of 1mol / L and stir continuously for 1 hour under the condition of a constant temperature water bath at 30°C, the solid-to-liquid ratio is 1:10, pump Separated by filtration, washed until neutral, dried for use;

[0039] (3) thermal activation: the sepiolite after acid activation in step (2) was roasted for 2 hours at 200°C under nitrogen protection conditions, and pulverized to a particle size of 80 meshes after cooling;

[0040] (4) Impregnation: impregnate the activated sepiolite in step (3) in the 2+ ﹑ Fe 3+ In nitrate solution, Fe 2+ / Fe 3+ The molar ratio is 1 / 1; the ratio ...

Embodiment 2

[0044] A kind of preparation method of modified sepiolite of the present embodiment, concrete preparation steps are as follows:

[0045] (1) Purification: Soak the natural sepiolite ore powder in distilled water with a solid-to-liquid ratio of 1:10, stir, stand still, and layer. 100 mesh;

[0046] (2) Acid activation: Put the sepiolite purified in step (1) into the HCl solution with a concentration of 2mol / L and stir continuously for 2 hours under the condition of a constant temperature water bath at 40°C, the solid-to-liquid ratio is 1:20, pump Separated by filtration, washed until neutral, dried for use;

[0047] (3) thermal activation: the sepiolite after acid activation in step (2) was roasted for 2 hours at 300° C. under nitrogen protection conditions, and pulverized to a particle size of 100 mesh after cooling;

[0048] (4) Impregnation: impregnate the activated sepiolite in step (3) in the 2+ ﹑ Fe 3+ In nitrate solution, Fe 2+ / Fe 3+ The molar ratio is 1 / 2; the ra...

Embodiment 3

[0052] A kind of preparation method of modified sepiolite of the present embodiment, concrete preparation steps are as follows:

[0053] (1) Purification: Soak the natural sepiolite ore powder in distilled water with a solid-to-liquid ratio of 1:15, stir, stand still, and layer. 120 mesh;

[0054] (2) Acid activation: put the sepiolite purified in step (1) into the HCl solution with a concentration of 3mol / L and stir continuously for 3 hours under the condition of a constant temperature water bath at 40°C, the solid-to-liquid ratio is 1:30, pump Separated by filtration, washed until neutral, dried for use;

[0055] (3) thermal activation: the sepiolite after acid activation in step (2) was roasted for 3 hours at 400° C. under nitrogen protection conditions, and pulverized to a particle size of 100 mesh after cooling;

[0056] (4) Impregnation: impregnate the activated sepiolite in step (3) in the 2+ ﹑ Fe 3+ In nitrate solution, Fe 2+ / Fe 3+ The molar ratio is 1 / 3; the ra...

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Abstract

The invention discloses a modified meerschaum, a preparation method and an application thereof. The preparation method comprises the following steps: immersing meerschaum by water with solid liquid ratio being 1:5-1:15, drying and crushing; then placing the purified meerschaum in an acid solution with concentration being 1-5mol / L and continuously stirring for 1-5 hours under water-bath condition at constant temperature of 30-60 DEG C; calcinating meerschaum through acid modification for 2-6 hours under temperature condition being 200-500 DEG C, cooling and crushing to granularity being 80-120 meshes; dipping the meerschaum after heat treatment in a soluble compound solution containing metal ions, stirring for a while under condition of 20-40 DEG C; finally dropping alkali in a mixing solution for adjusting acid-base value, and then processing to obtain the modified supported meerschaum. The modified meerschaum has good effect for catalysis ozone to deeply process the pulping papermaking waste water.

Description

technical field [0001] The invention belongs to the technical field of porous material modification, and in particular relates to a modified sepiolite and its preparation method and application. Background technique [0002] Sepiolite is a fibrous hydrous magnesium silicate clay mineral with layer chain structure, the theoretical chemical formula is Mg 8 (H 2 O) 4 [Si 6 o 15 ] 2 ·(OH) 4 ·8H 2 O, in its structural unit, silicon-oxygen tetrahedron and magnesium-oxygen octahedron alternate with each other, which is abundant in our country. [0003] In the fibrous crystal structure of sepiolite, there are many tubular penetrating channels consistent with the extension direction of the fiber. This special structure makes sepiolite have a large specific surface area, high porosity, and good adsorption and catalytic properties. The specific surface area of ​​sepiolite is very large, the theoretical specific surface area is 900m 2 / g, not only shows good performance in adso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/16B01J35/10B01J20/10B01J20/28B01J20/30C02F1/28C02F1/78
Inventor 杨仁党程峥杨飞
Owner SOUTH CHINA UNIV OF TECH
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