A kind of ordered mesoporous silicon nanomaterial with mcm-41 molecular sieve structure and its preparation method

A MCM-41, nanomaterial technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as unfavorable product pore size and structure, use of toxic reagents, and cumbersome preparation process, Achieve higher output, simple operation and good repeatability

Inactive Publication Date: 2014-10-22
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few studies on mesoporous elemental silicon, and the preparation methods mainly include electrochemical corrosion of single crystal silicon, ultrasonic, etc. These methods are not conducive to effectively controlling the pore size and structure of the product, the preparation process is cumbersome and toxic reagents are used, and the product yield is extremely high. inferior

Method used

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  • A kind of ordered mesoporous silicon nanomaterial with mcm-41 molecular sieve structure and its preparation method
  • A kind of ordered mesoporous silicon nanomaterial with mcm-41 molecular sieve structure and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Under stirring conditions, add 1 g of cationic surfactant CTAB into a narrow bottle filled with 3.5 ml NaOH (2 M) and 480 ml ultrapure water, and keep stirring for 30 min;

[0023] (2) Add 5 ml TEOS dropwise to the above solution, raise the temperature to 80 °C and continue stirring for 30 min to obtain a white translucent gel;

[0024] (3) The white gel-like substance obtained above was directly washed and dried with deionized water, dried at 90 oC overnight, then put into a muffle furnace, heated to 500 oC at a heating rate of 2 oC / min, and roasted for 5 h to obtain particles MCM-41 mesoporous silica molecular sieve;

[0025] (4) At room temperature, the obtained MCM-4 mesoporous silica molecular sieve and Mg powder were put into a tube furnace at a molar ratio of 1:2.5, and after a period of nitrogen gas, the temperature was raised to 650 °C at a certain heating rate and kept for 3 h , then down to room temperature;

[0026] (5) The obtained reduction product w...

Embodiment 2

[0028] (1) Under stirring conditions, add 2 g cationic surfactant CTAB into a narrow bottle containing 7 ml NaOH (2 M) and 480 ml ultrapure water, and keep stirring for 30 min;

[0029] (2) Add 9 ml TEOS dropwise to the above solution, raise the temperature to 80 °C and continue stirring for 30 min to obtain a white translucent gel;

[0030] (3) The white gel-like substance obtained above was directly washed with deionized water and drained, dried at 90 oC overnight, then put into a muffle furnace, heated to 550 oC at a heating rate of 2 oC / min, and roasted for 5 h to obtain particles MCM-41 mesoporous silica molecular sieve;

[0031] (4) At room temperature, the obtained MCM-4 mesoporous silica molecular sieve and Mg powder were put into a tube furnace at a molar ratio of 1:2.5, and after a period of nitrogen gas, the temperature was raised to 650 °C at a certain heating rate and kept for 3 h , then down to room temperature;

[0032] (5) The obtained reduction product was s...

Embodiment 3

[0034] (1) Under stirring conditions, add 1 g of cationic surfactant CTAB into a narrow bottle filled with 3.5 ml NaOH (2 M) and 480 ml ultrapure water, and keep stirring for 30 min;

[0035] (2) Add 5 ml TEOS dropwise to the above solution, raise the temperature to 80 °C and continue stirring for 30 min to obtain a white translucent gel;

[0036] (3) The white gel-like substance obtained above was directly washed with deionized water and drained, dried at 90 oC overnight, then put into a muffle furnace, heated to 550 oC at a heating rate of 2 oC / min, and roasted for 5 h to obtain particles MCM-41 mesoporous silica molecular sieve;

[0037] (4) At room temperature, the obtained MCM-4 mesoporous silica molecular sieve and Mg powder were put into a tube furnace at a molar ratio of 1:4, and after passing nitrogen for a period of time, the temperature was raised to 650 °C at a certain heating rate and kept for 3 h , then down to room temperature;

[0038] (5) The obtained reduct...

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Abstract

The invention relates to an ordered mesopore silicon nano material with an MCM-41 molecular sieve structure and a preparation method, which belongs to the technical field of an inorganic nano material. Magnesium heat reduction reaction is adopted, the silicon dioxide-based MCM-41 mesoporous moledular sieve with a regular porous structure is used as precursor, and the mesopore monatomic silicon material is produced under a low temperature. Since the temperature of the magnesium heat reduction process is low, a microstructure of the molecular sieve is reserved in the reaction process, the mesopore silicon produced through the method is a mesopore silicon nano material with the MCM-41 molecular sieve strcutre and has characteristics of uniformity in appearance, continuity and orderliness in porous structure, uniformity in porous walls, high specific surface area and obvious photoluminescence properties. The ordered mesopore silicon nano material has wide application prospect in the fields such as lithium-ion batteries, photoelectric materials and gas sensors. Due to the adoption of the ordered mesopore silicon nano material with the MCM-41 molecular sieve structure and the preparation method, a novel through is provided for preparing the porous silicon nano material with a special shape and ordered porous structure.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and specifically relates to an ordered mesoporous silicon nanometer material with an MCM-41 type molecular sieve structure and a preparation method thereof. Background technique [0002] MCM-41 mesoporous molecular sieve is a typical representative of the new molecular sieve M41S system prepared by Beck et al. of Mobil Company in the United States in the early 1990s. It has a one-dimensional hexagonal orderly arranged pore structure with uniform pore size. The difference between 1.5 and 10 nm varies, and the pore size, microscopic morphology, strength and even surface acidity of the material can be finely tuned and controlled by simply changing the synthesis conditions. Due to the existence of the regular mesoporous structure, the material has a high specific surface area (> 1000 m 2 / g) and pore volume (> 0.7 cm 3 / g), the larger pores break through the limit of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C01B33/021B82Y30/00
Inventor 张艳华杨宏涛邓莹程江陈慧叶小舟郑舒涂铭旌
Owner CHONGQING UNIV OF ARTS & SCI
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