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Preparation method for aerogel for adsorbing nitrocompound

A nitro compound, aerogel technology, applied in silicon compounds, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of difficult regeneration, limited use range of activated carbon, short service life, etc., and achieve good hydrophobic performance. , the experimental environment is not complicated, the effect of good hydrophobic performance

Inactive Publication Date: 2012-06-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most commonly used adsorbent is activated carbon. Although activated carbon is cheap and easy to obtain, its service life is short and it is not easy to regenerate. In this respect, the scope of use of activated carbon is limited.

Method used

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  • Preparation method for aerogel for adsorbing nitrocompound
  • Preparation method for aerogel for adsorbing nitrocompound
  • Preparation method for aerogel for adsorbing nitrocompound

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] 14.7ml of tetramethyl orthosilicate, 7.2ml of deionized water, 68ml of absolute ethanol and 2ml, 4ml, 6ml, 8ml, 10ml, 12ml, 14ml, 16ml of methyltriethoxysilane (MTES) and A mixed solution of 0.3ml of hydrochloric acid (1mol / L) was heated at 40°C with constant stirring, and after 60min, aqueous ammonia was added to adjust the pH to 7.5. Continue to stir for 60 min to make it undergo polycondensation reaction, and finally leave it to stand to form a wet gel. The wet gel was replaced with absolute ethanol for solvent replacement every 24 hours for a total of 3 times. Finally, after drying, the hydrophobic SiO 2 airgel.

[0026] figure 1 middle For the influence of different molar ratios of MTES / TMOS on the gel time in the hydrophobic airgel prepared in Example 1, it can be seen from the figure that the larger the molar ratio, the longer the gel time.

example 2

[0028] Mix 14.7ml tetramethyl orthosilicate, 14.4ml deionized water, 93ml absolute ethanol and 2.4ml, 4.8ml, 7.2ml, 9.6ml, 12ml, 14.4ml, 16.8ml, 19.2ml of phenyltriethyl A mixed solution of oxysilane (PTES) and 0.3ml of nitric acid (1mol / L) was heated at 50°C with constant stirring, and after 40min, sodium hydroxide was added to adjust the pH to 7.5. Continue to stir for 70min to make it undergo polycondensation reaction, and finally let it stand to form a wet gel. The wet gel was replaced with absolute ethanol for solvent replacement every 12 hours for a total of 4 replacements. Finally, after drying, the hydrophobic SiO 2 airgel.

[0029] figure 1 middle For the influence of different molar ratios of PTES / TMOS in the hydrophobic airgel prepared in Example 2 on the gel time, it can be seen from the figure that the larger the molar ratio, the longer the gel time.

example 3

[0031] Mix 14.7ml tetramethyl orthosilicate, 7.2ml deionized water, 68ml absolute ethanol and 1.53ml, 3.06ml, 4.59ml, 6.12ml, 7.65ml, 9.18ml, 10.71ml, 12.24ml of vinyl tri The mixed solution of ethoxysilane (VTES) and 0.8ml acetic acid was heated at 50°C with constant stirring, and after 70min, potassium hydroxide was added to adjust the pH value to 7.5 respectively. Continue to stir for 40min to make it undergo polycondensation reaction, and finally let it stand to form a wet gel. The wet gel was replaced with absolute ethanol for solvent replacement every 24 hours for a total of 5 times. Finally, after drying, the hydrophobic SiO 2 airgel.

[0032] figure 1 middle For the influence of different molar ratios of VTMS / TMOS on the airgel in the hydrophobic airgel that example 3 makes, it can be seen from the figure that the gel times of the three modifiers all vary with the mol ratio of the modifier / TMOS The increase of , and the gel time of the three are the same.

[003...

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Abstract

The invention provides a preparation method for aerogel for adsorbing nitrocompound. A silicon source, water and absolute ethyl alcohol are adopted as reactant, acid is adopted as catalyst, hydrophobic modification agent is added into mixture, the mixture is continuously stirred at the temperature ranging from 40 DEG C to 60 DEG C, finally, alkali is added in the mixture, and the mixture is in standing to form aerogel after pH (potential of hydrogen) is adjusted to 6.5 to 8. Solvent displacement of the wet aerogel is realized by the absolute ethyl alcohol, and the water is cemented out. Finally, hydrophobic SiO2 aerogel can be prepared via drying. The hydrophobic modified silica aerogel prepared by the preparation method has characteristics of high hydrophobicity, high porosity, large specific surface area and low density, can excellent adsorb nitrocompound in wastewater, and has excellent reproducibility as compared with frequently used adsorbent such as activated carbon and the like.

Description

technical field [0001] The invention belongs to the field of preparation technology of airgel materials, and in particular relates to a preparation method of airgel for adsorption of nitro compounds by a two-step sol-gel method combined with a drying process, which is used for adsorption and treatment of nitro compounds in explosive waste water . Background technique [0002] SiO 2 Airgel is a new type of low-density nanoporous amorphous solid material with a continuous three-dimensional network structure, its porosity can reach 80-99.8%, and its specific surface area can reach 500-1200m 2 / g, the typical pore size is between 1 and 100nm. Due to SiO 2 The structural characteristics of airgel make it show unique properties different from ordinary solid-state materials in terms of mechanics, acoustics, heat, optics and electricity, such as strong adsorption performance, extremely low thermal conductivity, low refractive index, low Acoustic impedance, etc. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F1/58
Inventor 崔升周小芳沈晓冬吴战武
Owner NANJING UNIV OF TECH
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