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Mesoporous material preparation method using fly ash

A technology of mesoporous materials and fly ash, which is applied in the field of waste recycling, can solve the problems of restricting large-scale production and increasing costs, and achieve the effects of saving costs, eliminating harm to the environment, and excellent performance

Inactive Publication Date: 2014-06-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the same material increases, limiting the possibility of mass production

Method used

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  • Mesoporous material preparation method using fly ash
  • Mesoporous material preparation method using fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) First, mix fly ash and NaOH (mass ratio 1:1) and melt at 500°C for 1 hour, then cool to obtain the mixture;

[0025] (2) Then, add distilled water to the mixture to dissolve, filter and take the supernatant for use, wherein the supernatant is aluminosilicate solution;

[0026] (3) Dissolve the surfactant P123 in distilled water, add 2M HCl until the pH is 0.9, and the molar ratio of each substance in the mixed precursor solution is 1Si:0.016P123:5.4HCl:200H 2 O, fully stirred at 35~40°C; after aging in an oven at 95°C for 24 hours, filter, wash, and dry;

[0027] (4) Finally, the dried material was calcined at 550°C for 5 hours, the heating rate was 1°C / min, and the powdered mesoporous material was obtained after cooling.

Embodiment 2

[0029] (1) First, mix fly ash and NaOH (mass ratio 1:1.2) and melt at 550°C for 1.5h, then cool to obtain the mixture;

[0030] (2) Then, add distilled water to the mixture to dissolve, filter and take the supernatant for use, wherein the supernatant is aluminosilicate solution;

[0031] (3) Dissolve the surfactant P123 in distilled water, add 2M HCl until the pH is 0.6, and the molar ratio of each substance in the mixed precursor solution is 1Si:0.016P123:17.3HCl:200H 2 O, fully stirred at 35~40°C; after aging in an oven at 95°C for 24 hours, filter, wash, and dry;

[0032] (4) Finally, the dried material was calcined at 550°C for 5 hours, the heating rate was 1°C / min, and the powdered mesoporous material was obtained after cooling.

Embodiment 3

[0034] (1) First, mix fly ash and NaOH (mass ratio 1:1.3) and melt at 600°C for 2 hours, cool to obtain the mixture; (2) Then, add distilled water to the mixture to dissolve, filter to get the supernatant The liquid is ready for use, wherein the supernatant is an aluminosilicate solution;

[0035] (3) Dissolve the surfactant P123 in distilled water, add 2M HCl until the pH is 0.3, and the molar ratio of each substance in the mixed precursor solution is 1Si:0.016P123:24.5HCl:200H 2 O, fully stirred at 35~40°C; after aging in an oven at 95°C for 24 hours, filter, wash, and dry;

[0036] (4) Finally, the dried material was calcined at 550°C for 5 hours, the heating rate was 1°C / min, and the powdered mesoporous material was obtained after cooling.

[0037] figure 1 It is the SEM photo of SBA-15-CFA in Example 3, where picture (a) is a low magnification (10K) SEM picture, and picture b is a high magnification (80K) SEM picture. figure 2 It is a TEM photo of the adsorption mater...

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Abstract

The invention belongs to the field of waste reutilization, and relates to a preparation method of fly-ash-based SBA-15, and the preparation method comprises the following steps: firstly, mixing fly ash and an alkali, then melting, and cooling to obtain a mixture; then adding distilled water into the mixture for dissolving, filtering to take supernatant for standby use, wherein the supernatant is an aluminosilicate solution; then, dissolving surfactant P123 in the distilled water, regulating the pH to acidic, fully stirring; then aging, filtering, washing, drying, roasting and cooling to obtain the powder-like mesoporous material fly-ash-based SBA-15. The fly-ash-based SBA-15 prepared by the method has a regular two-dimensional hexagonal structure, has a pore volume of 0.6-0.9cm<3> / g, a specific surface area as high as 800m<2> / g, and a pore diameter of 5-8nm. The method is simple, and is less in environment pollution due to use of effective components in waste as a silicon source.

Description

technical field [0001] The invention belongs to the field of waste recycling and relates to a method for preparing fly ash-based SBA-15. Background technique [0002] Coal fly ash (CFA) mainly comes from the fine particle dispersed residues after pulverized coal combustion in coal-fired power plants. Using fly ash as raw material to prepare porous materials is one of the important ways to develop high value-added products using fly ash at home and abroad in recent years. Porous materials prepared by using fly ash include activated carbon, zeolite, etc. For example, the Chinese patent application "New Technology for Preparing Activated Carbon from Fly Ash" with application number 200810143173.3 proposes to separate carbon from fly ash by means of flotation separation. Particles, and then through a variety of subsequent treatment processes to obtain activated carbon. However, the disadvantages of this method, such as complex and cumbersome process, high energy consumption an...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30B09B3/00
Inventor 范建伟姜序闵弘扬李丹丹
Owner TONGJI UNIV
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