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Crystallized mesoporous magnesium silicate powder and preparation method thereof

A technology of crystallizing mesoporous and magnesium silicate, which is applied in the direction of magnesium silicate and silicate, can solve the problems of difficult control of hydrolysis-condensation products, hard template channels, difficult recycling and reuse, etc., and reach the experimental calcination temperature Low, high crystallinity, large pore size effect

Inactive Publication Date: 2015-04-08
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These characteristics not only make it have the advantages of nanomaterials, but also overcome the shortcomings of nanomaterials, such as poor stability, easy agglomeration, difficult recycling, etc.
The traditional preparation techniques of non-silicon-based mesoporous materials mainly include soft-template-assisted method and hard-template inverse replication method. These methods show various deficiencies in the preparation of magnesium silicate, such as difficult control of hydrolysis-polycondensation products and difficulty in self-assembly. , Hard template channels are not easy to be completely filled by precursors, poor experimental repeatability, etc.

Method used

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  • Crystallized mesoporous magnesium silicate powder and preparation method thereof
  • Crystallized mesoporous magnesium silicate powder and preparation method thereof
  • Crystallized mesoporous magnesium silicate powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1, with 0.375mmol MgCl 2 ·6H 2 O with 5mmol NH 4 Cl was dissolved in 50 mL of deionized water, and then 0.5 mL of 28% NH 3 ·H 2 O stir well to make solution a. 0.0387g C@SBA-15 (containing 0.024g SiO 2 ) was dispersed in 25mL deionized water to prepare suspension b. The solution a and the suspension b were mixed and fully stirred, then transferred to a 100mL reaction kettle, and hydrothermally reacted at 140°C for 12h. The product after the hydrothermal reaction was cooled to room temperature, centrifuged and the supernatant was discarded. Wash with deionized water until pH=7. After drying at 100° C. for 4 hours, transfer to a muffle furnace, and calcining at 600° C. for 5 hours to remove C, and obtain crystallized mesoporous magnesium silicate powder. figure 1 It is a scanning electron micrograph of the prepared crystalline mesoporous magnesium silicate powder.

Embodiment 2

[0021] Embodiment 2, with 0.75mmol MgCl 2 ·6H 2 O with 10mmol NH 4 Cl was dissolved in 50 mL of deionized water, and then 1 mL of 28% NH 3 ·H 2 O stir well to make solution a. 0.0774g C@SBA-15 (containing 0.048g SiO 2 ) was dispersed in 25mL deionized water to prepare suspension b. The solution a and the suspension b were mixed and fully stirred, then transferred to a 100mL reaction kettle, and hydrothermally reacted at 140°C for 12h. The product after the hydrothermal reaction was cooled to room temperature, centrifuged and the supernatant was discarded. Wash with deionized water until pH=7. After drying at 100° C. for 4 hours, transfer to a muffle furnace, and calcining at 600° C. for 5 hours to remove C, and obtain crystallized mesoporous magnesium silicate powder. figure 2 It is the nitrogen absorption and desorption spectrum of the prepared crystalline mesoporous magnesium silicate powder.

Embodiment 3

[0022] Embodiment 3, with 1.5mmol MgCl 2 ·6H 2 O with 20mmol NH 4Dissolve Cl in 50 mL of deionized water, then add 2 mL of 28% NH 3 ·H 2 O stir well to make solution a. 0.1548g C@SBA-15 (containing 0.096g SiO 2 ) was dispersed in 25mL deionized water to prepare suspension b. The solution a and the suspension b were mixed and fully stirred, then transferred to a 100mL reaction kettle, and hydrothermally reacted at 140°C for 12h. The product after the hydrothermal reaction was cooled to room temperature, centrifuged and the supernatant was discarded. Wash with deionized water until pH=7. After drying at 100° C. for 4 hours, transfer to a muffle furnace, and calcining at 600° C. for 5 hours to remove C, and obtain crystallized mesoporous magnesium silicate powder. image 3 It is the small-angle X-ray diffraction pattern of the prepared crystalline mesoporous magnesium silicate powder.

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Abstract

The invention discloses crystallized mesoporous magnesium silicate (3MgO.4SiO2.2H2O) powder and a preparation method thereof. The crystallized mesoporous magnesium silicate (3MgO.4SiO2.2H2O) powder is of a two-dimensional hexagonal mesoporous structure, and a mesopore wall is composed of crystalline-state magnesium silicate. The preparation method of the crystallized mesoporous magnesium silicate powder comprises the following steps: by taking C-filled mesoporous silica SBA-15(C@SBA-15) as an auxiliary template and silicon source, MgCl2.6H2O as a magnesium source, and NH4Cl, NH3.H2O and deionzed water as reaction mediums, carrying out hydrothermal reaction at a certain temperature for a certain period of time, so that mesoporous magnesium silicate is obtained, wherein in a hydrothermal reaction process, SiO2 in C@SBA-15 is taken as reactant to participate in reaction, C in C@SBA-15 can be used for supporting the mesopore wall, magnesium silicate generated by reaction coats the surface of C to form a shell layer, and the magnesium silicate shell layer is taken as the mesopore wall; carrying out high-temperature calcining on the hydrothermal reaction product for removing C to form a mesoporous passage so as to finally obtain the crystallized mesoporous magnesium silicate powder. The prepared mesoporous magnesium silicate powder has high degree of order, large aperture and specific surface area, high crystallinity and good stability.

Description

technical field [0001] The invention relates to a magnesium silicate with a wide application background and a preparation method thereof, in particular to a crystalline magnesium silicate powder with an ordered mesoporous structure and a preparation method thereof. Background technique [0002] Environmental pollution is a prominent problem facing social development. Among them, heavy metal ions in water and organic pollutants in printing and dyeing wastewater seriously endanger human health. At present, the treatment methods for these pollutants mainly include: biological treatment method, chemical oxidation method, flocculation precipitation method, electrolysis method, adsorption method and so on. Among them, removal by adsorption is one of the most effective methods. The adsorption method has the advantages of simple operation, low equipment investment and treatment cost because it does not introduce new pollutants and does not require energy supply. In addition, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/22
Inventor 陆青山李强李景峰董晨浩卢锦华张晶晶初永辉
Owner INNER MONGOLIA UNIVERSITY
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