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Method for preparing porous nano silicon dioxide pellets under neutral condition

A technology of nano-silica and neutral conditions, applied in the direction of silica, silicon oxide, nanotechnology, etc., can solve problems such as difficult to obtain porous silica, achieve high mechanical strength, uniform dispersion, and increase material strength Effect

Active Publication Date: 2021-11-09
赣江中药创新中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, under neutral conditions, conventional porous silica is easy to control at the micron level, and it is difficult to obtain nanoscale porous silica

Method used

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  • Method for preparing porous nano silicon dioxide pellets under neutral condition
  • Method for preparing porous nano silicon dioxide pellets under neutral condition
  • Method for preparing porous nano silicon dioxide pellets under neutral condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Formation of imidazolium ionic liquid micelles: Weigh 1.720g of 1-dodecyl-3-methylimidazolium chloride salt (concentration about 40mM) and add it to 150mL water and stir to make it self-assemble to form micelles. The schematic diagram is as follows figure 1 shown;

[0037] Weigh 0.123g trisodium phosphate (concentration about 5mM) into the above solution, add an appropriate amount of phosphoric acid to adjust the pH of the solution to 7.0; Stirring and reacting for 120 minutes, a white precipitate precipitated out, centrifuged at 8000 rpm, and the product was dried in an oven at 80°C, and then calcined in a muffle furnace at 600°C for 4 hours to obtain porous silica pellets.

[0038] The interaction between the imidazole group and the phosphate radical can make silica grow on the micelles formed by the imidazole ionic liquid, and the uniformly dispersed bead size of the preparation is about 60nm ( figure 2 ), BET experiments show that the pore diameter is about 0.38nm...

Embodiment 2

[0040] Formation of imidazolium ionic liquid micelles: Weigh 1.720g of 1-dodecyl-3-methylimidazolium chloride salt (concentration about 40mM) into 150mL water and stir to make it self-assemble to form micelles;

[0041] Weigh 0.246g trisodium phosphate (concentration about 10mM) into the above solution, add an appropriate amount of phosphoric acid to adjust the pH of the solution to 7.0; slowly add 3.3mL tetraethyl orthosilicate into the solution, 60°C, 150rpm Stirring and reacting for 120 minutes, a white precipitate precipitated out, centrifuged at 8000 rpm, and the product was dried in an oven at 80°C, and then calcined in a muffle furnace at 600°C for 4 hours to obtain porous silica pellets.

[0042] The interaction between the imidazole group and the phosphate radical can make silica grow on the micelles formed by the imidazole ionic liquid, and the uniformly dispersed bead size of the preparation is about 260nm ( Figure 4 ), BET experiments show that the pore diameter is ...

Embodiment 3

[0044] Formation of imidazolium ionic liquid micelles: Weigh 1.720g of 1-dodecyl-3-methylimidazolium chloride salt (concentration about 40mM) into 150mL water and stir to make it self-assemble to form micelles;

[0045] Weigh 0.246g of trisodium phosphate (concentration about 10mM) in the above solution, add an appropriate amount of phosphoric acid to adjust the pH of the solution to 7.0; add 3.3mL of tetraethyl orthosilicate to the solution in equal amounts in 2 steps (per Add 1.1mL in 2h, 3 times in total), 95°C, 150rpm stirring reaction for 120min, a white precipitate precipitated, 8000rpm centrifuge, the product was dried in an oven at 80°C, and then calcined in a muffle furnace at 600°C for 4h to obtain porous silica pellets .

[0046] The interaction between the imidazole group and the phosphate radical can make silica grow on the micelles formed by the imidazole ionic liquid, and the uniformly dispersed bead size of the preparation is about 550nm ( Figure 6 ), BET exp...

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Abstract

The invention relates to the technical field of inorganic material synthesis, and provides a method for preparing porous nano silicon dioxide pellets under a neutral condition, which comprises the following three steps: formation of imidazole ionic liquid micelle, deposition of silicon dioxide and calcination of silicon pellets. Compared with a traditional sol-gel method, the method has the advantages that a catalytic system of imidazole ionic liquid and polybasic weak acid radicals is used, the porous nano silicon dioxide pellets are prepared in a neutral water phase system, and the method has the advantages of being efficient, simple, green and low in consumption. By adopting the method disclosed by the invention, the porous nano silicon dioxide spheres which are relatively uniform in dispersion, high in mechanical strength, controllable in particle size and adjustable in specific surface area are obtained.

Description

technical field [0001] The invention relates to the technical field of inorganic material synthesis, in particular to a method for preparing porous nano-silica spheres under neutral conditions. Background technique [0002] Due to the advantages of high specific surface area, large pore size and easy surface functionalization, mesoporous silica nanospheres (MSNs) have attracted more and more attention, and are widely used in catalyst supports, separation materials, biomedicine, etc. Many fields. For example, MSNs can be loaded with catalysts or enzymes, which can be used to solve the problem of multiple recycling of catalysts or enzymes in the chemical production process. MSNs also have excellent biocompatibility, chemical inertness, and diffusion-controlled drug release mechanism, which can be used to develop new drug release systems. The surface of silica is rich in silanol, which can be used as a stationary phase support for high performance liquid chromatography after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18B82Y30/00B82Y40/00
CPCC01B33/18B82Y30/00B82Y40/00C01P2004/32C01P2004/64C01P2004/60C01P2006/16C01P2006/12C01P2004/03C01P2004/62
Inventor 梁鑫淼孟凡栋郭志谋叶贤龙谌望孙
Owner 赣江中药创新中心
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