A kind of preparation method of aerogel adsorbent for water treatment and air purification
An air purification and aerogel technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as structural damage, and achieve the effects of easy recovery, large adsorption capacity, and good application prospects.
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example 1
[0017] Stir and mix 0.1mol methyltrimethoxysilane, 0.1mol methanol and 0.2mol deionized water at 20°C for 60 minutes, then add 0.0003mol benzoic acid and continue stirring for 40 minutes, then add 1mol 3-aminopropyltriethoxysilane and 1ml mass Fraction 25% (0.013mol) of ammonia water was stirred for 5 minutes and then placed in a 30°C oven for 36 hours, then the solution was taken out of the oven, and 0.5 times the volume of ammonia water with a mass fraction of 25% was added and stirred for 15 minutes. The gel is obtained, and the gel is supercritically dried to obtain a hydrophobic amino-modified silica airgel. The specific surface area of the sample is 417m 2 / g, pore volume 1.83cm 3 / g. Spectrophotometer method to measure hydrophobic amino-modified silica airgel to heavy metal ion Cu in 1g / L heavy metal salt solution 2+ 、Ni 2+ and Cr 3+ The adsorption amounts were 220, 109 and 69 mg / g, respectively. Hydrophobic amino-modified silica airgel to 400ppm CO in a fixed b...
example 2
[0021] Stir and mix 0.1mol dimethyldimethoxysilane, 0.3mol ethanol and 0.6mol deionized water at 60°C for 30 minutes, then add 0.001mol oxalic acid and continue stirring for 10 minutes, then add 0.01mol 3-ureapropyltrimethoxysilane And 5ml of ammonia water with a mass fraction of 28% (0.075mol) continued to stir for 1 minute and then placed in a 70°C oven for 3 hours, then the solution was taken out from the oven, added 1 times the volume of ammonia with a mass fraction of 26%, stirred for 1 minute, and finally 20 ℃ to obtain a gel, and the gel is supercritically dried to obtain a hydrophobic amino-modified silica airgel. Sample specific surface area 513m 2 / g, pore volume 1.91cm 3 / g. Spectrophotometer method to measure hydrophobic amino-modified silica airgel to heavy metal ion Cu in 1g / L heavy metal salt solution 2+ 、Ni 2+ and Cr 3+ The adsorption amounts were 98, 59 and 37 mg / g, respectively. Hydrophobic amino-modified silica aerogels measured against 1% CO in a fixe...
example 3
[0023] Stir and mix 0.1mol trimethylmethoxysilane, 0.2mol isopropanol and 0.2mol deionized water at 40°C for 40 minutes, then add 0.0005mol benzoic acid and continue stirring for 30 minutes, then add 0.1mol 3-aminopropyltrimethoxysilane and 5ml of ammonia water with a mass fraction of 27% (0.072mol) continued to stir for 10 minutes, then placed in a 70°C oven for 6 hours, then took the solution out of the oven, added 1.5 times the volume of ammonia water with a mass fraction of 25%, stirred for 5 minutes, and finally put it in an oven at 20°C. Stand still to obtain a gel, and the gel is supercritically dried to obtain a hydrophobic amino-modified silica airgel. Sample specific surface area 220m 2 / g, pore volume 1.33cm 3 / g. Spectrophotometer method to measure hydrophobic amino-modified silica airgel to heavy metal ion Cu in 1g / L heavy metal salt solution 2+ 、Ni 2+ and Cr 3+ The adsorption amounts were 186, 101 and 64 mg / g, respectively. Hydrophobic amino-modified silica...
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