Preparation method for melamine/thiourea/formaldehyde aerogel
A technology of melamine and airgel, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of precious metal ion adsorption capacity and insufficient selective adsorption, and achieve gel time Short, high specific surface area, simple preparation method
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Embodiment 1
[0022] Dissolve 0.38g of thiourea in 20ml of deionized water for use. Another 4.05g of melamine was mixed with 74ml of deionized water, and stirred at 95°C at a speed of 350 rpm. After stirring for 10 minutes, 0.15g of catalyst sodium hydroxide solid powder was added, and after stirring for 10 minutes, 9.65 Formaldehyde solution with a concentration of 37% in g, keep stirring the solution until it is clear and transparent, add the thiourea solution prepared in advance after 8 minutes, continue stirring for 15 minutes, then move to room temperature and stir to room temperature. Then use 1.0mol / L hydrochloric acid to adjust the pH value of the obtained solution to about 1.5, continue to stir for 10 to 20 minutes, pour the solution into a self-made container, seal it and put it in a constant temperature drying oven at 95°C for sol-gel reaction to obtain wet gel. The wet gel was first replaced once with a mixed solution of ethanol and deionized water with a volume ratio of 2:1 at...
Embodiment 2
[0024] Take 0.48g of thiosemicarbazide and dissolve it in 20ml of deionized water for later use. Another 5.06g of cyanuric acid-amide was mixed with 70ml of deionized water, and magnetically stirred at 95°C and a speed of 400 rpm. After stirring for 10 minutes, 0.2g of catalyst sodium hydroxide solid powder was added, and continued After stirring for 10 minutes, add 12.05 g of formaldehyde solution with a concentration of 37%, and continue to stir the solution until it is clear and transparent. After 10 minutes, add the thiosemicarbazide solution prepared in advance, continue stirring for 10 minutes, then move to room temperature and stir to room temperature. Then adjust the pH value to about 3.0 with 1.0 mol / L hydrochloric acid, continue to stir for 10 to 20 minutes, and then pour the solution into a self-made container. After the sealing treatment, put it into a constant temperature drying oven at 95°C for sol-gel reaction to obtain a wet gel. The wet gel was first replaced...
Embodiment 3
[0026] Dissolve 0.86g of acylthiourea in 20ml of deionized water for use. Another 9.11g of ammeline was mixed with 62ml of deionized water, and magnetically stirred at 95°C at a speed of 400 rpm. After stirring for 10 minutes, 0.3g of catalyst sodium hydroxide solid powder was added, and continued After stirring for 10 minutes, add 21.70 g of formaldehyde solution with a concentration of 37%, and continue to stir the solution until it is clear and transparent. After 15 minutes, add the acylthiourea solution prepared in advance, continue stirring for 15 minutes, then move to room temperature and stir to room temperature. Then adjust the pH value to about 1.5 with 1.0 mol / L hydrochloric acid, continue to stir for 10 to 20 minutes, and then pour the solution into a self-made container. After sealing treatment, put it into a constant temperature drying oven at 85°C for sol-gel reaction to obtain a wet gel. The wet gel was first replaced once with a mixed solution of ethanol and d...
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