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Mesoporous silicon film and one-step preparation method and application thereof

A mesoporous silicon, multi-layer porous technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as soil pollution, soil erosion, life health and ecological environment loss , to achieve a wide range of sources, the effect of saving energy

Inactive Publication Date: 2017-07-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Outdated production techniques and technologies in rare earth mining, dressing, smelting, and separation have seriously damaged surface vegetation, caused soil erosion, soil pollution, and acidification, resulting in crop yield reduction or even failure, and brought great losses to public life, health, and the ecological environment.

Method used

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  • Mesoporous silicon film and one-step preparation method and application thereof
  • Mesoporous silicon film and one-step preparation method and application thereof
  • Mesoporous silicon film and one-step preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Take 10g of commercially available cotton and place it in 150mL of sulfuric acid solution with a volume fraction of 50%, then stir and react at 35°C for 2h, then transfer to a beaker, dilute to 600mL with distilled water, then let stand overnight to separate layers, pour Remove the supernatant, centrifuge the suspension, wash with distilled water three times to remove the amorphous substance, transfer the suspension to a dialysis membrane for dialysis for 1 to 4 days, adjust the pH to 2.4, then sonicate for 10 minutes, and dilute to obtain nanocellulose crystals ( NCC) for use;

[0042] (2) Pipette 10 mL of NCC obtained in step (1), ultrasonicate for 20 min, place in a round bottom flask, add 100 mg of glucose, stir for 1 h, then add 40 μL of diethylphosphorylethyltriethoxysilane (PETES ) and 410 μL of tetraethyl silicate (TEOS), stirred and reacted at 50°C for 2 hours, poured into a watch glass and dried in a water bath at 25°C for 1 to 2 days;

[0043] (3) placin...

Embodiment 2

[0056] (1) Take 10g of commercially available cotton and place it in 40mL of sulfuric acid solution with a volume fraction of 60%, then stir and react at 45°C for 3h, then transfer it to a beaker, dilute to 600mL with distilled water, then let the layers stand overnight, pour Remove the supernatant, centrifuge the precipitate, wash with distilled water three times to remove the mixed solution attached to the precipitate, transfer the precipitate to a dialysis membrane for dialysis for 1 to 4 days, adjust the pH to 3 within half an hour, then sonicate for 20 minutes, and dilute to obtain nanofibers Plain crystal (NCC) for use;

[0057] (2) Pipette 10 mL of nanocellulose crystals (NCC) obtained in step (1) and sonicate for 20 min, place them in a round bottom flask, add 130 mg of glucose, stir for 3 h, and then add 50 μL of diethylphosphorylethyl triethyl A mixed solution of oxysilane (PETES) and 400 μL tetraethyl silicate (TEOS), stirred at 60°C for 3 hours, poured into a watch...

Embodiment 3

[0070] (1) Get 10g of commercially available cotton and place it in 150mL of 70% sulfuric acid solution by volume fraction, then stir and react at 55°C for 4 hours, then transfer it to a beaker, dilute to 600mL with distilled water, then let stand overnight to separate layers, Pour off the supernatant, centrifuge the precipitate, wash with distilled water three times to remove the mixed solution attached to the precipitate, transfer the precipitate to a dialysis membrane for dialysis for 1 to 4 days, adjust the pH to 2.4, then sonicate for 10 minutes, and dilute to obtain nanocellulose crystals (NCC) for use;

[0071] (2) Take out the NCC obtained from the treatment in step (1), pipette 10mL after ultrasonication for 20min, place it in a round bottom flask, add 200mg glucose, stir for 2h, then add 60μL diethylphosphorylethyltriethoxy A mixed solution of silane (PETES) and 390 μL tetraethyl silicate (TEOS), stirred at 70°C for 4 hours, poured into a watch glass and dried in a w...

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Abstract

The invention provides a mesoporous silicon film and a one-step preparation method and application thereof; the preparation method comprises: placing cotton in sulfuric acid solution, stirring for reaction, taking out after reaction, diluting with distilled water, and standing for layering; pouring off clear supernate, centrifugally separating lower suspension, and washing; transferring the centrifuged suspension to a dialysis membrane for dialysis, adjusting pH, ultrasonically treating to obtain nanocrystalline cellulose, and getting ready for use; ultrasonically treating the nanocrystalline cellulose, placing in a round-bottom flask, adding glucose, stirring, adding mixed liquid A of diethylphosphatoethyltriethoxysilane and tetraethyl orthosilicate, stirring, and drying to obtain mesoporous silicon film A; placing the mesoporous silicon film A in sulfuric acid solution, and removing a template to obtain mesoporous silicon film B; placing the mesoporous silicon film B in concentrated hydrochloric acid for reaction to obtain mesoporous silicon film C; flushing the mesoporous silicon film C with distilled water and absolute ethyl alcohol, and drying to obtain final mesoporous silicon film. Biomass cellulose is used as the template herein, the source range is wide, and the mesoporous silicon film is green.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous silicon membrane with high selectivity and high adsorption capacity for lanthanum. The preparation method adopts one-step synthesis and is applied to the adsorption and recovery of rare earth element lanthanum, belonging to the technical field of material preparation and separation. Background technique [0002] Rare earth is known as the "gold" of industry. Because of its excellent optical, electromagnetic and other physical properties, it can greatly improve the quality and performance of other products. Therefore, it is used to form new materials with different properties and varieties with other materials. Moreover, rare earths are lubricants for many high-tech industries such as electronics, lasers, nuclear industries, and superconductivity, and are mainly used in the manufacture of special alloy precision optical glass and high-refraction optical fiber boards. It is used as a catalyst f...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C22B59/00C22B3/24
CPCB01J20/22B01J20/24B01J20/28035B01J20/28083B01J20/3057C22B3/24C22B59/00Y02P10/20
Inventor 刘恩秀张福生郑旭东刘恩利闫永胜
Owner JIANGSU UNIV
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