Cellulose-based carbon-doped aerogel for in-situ passivation remediation of heavy metal contaminated soil and preparation method of cellulose-based carbon-doped aerogel
A cellulose-based, carbon aerogel technology, applied in chemical instruments and methods, soil conditioning materials, applications, etc., can solve the problems of high remediation cost, poor biocompatibility, secondary pollution, etc., to reduce leaching toxicity, Abundant surface groups, the effect of solving environmental problems
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Embodiment 1
[0041] A cellulose-based doped carbon aerogel for soil heavy metal passivation and a preparation method thereof, the specific steps are as follows:
[0042] Take 5g of dried reeds and crush them, pass through a 60-mesh sieve, then immerse in a pH=4 sodium hypochlorite solution with a concentration of 2wt% and heat and stir at 60°C for 2.0h, wash with water until neutral, then soak in a 7wt% NaOH solution and stir at 60°C 2h, centrifuged, washed with water until neutral, then added to 100mL of 40wt% sulfuric acid for acidification at room temperature for 1.0h, washed with water until neutral, dried to obtain acidified cellulose;
[0043] Prepare fiber dissolving solution according to the ratio of sodium hydroxide, urea, and water at a mass ratio of 7:12:81, sonicate until completely dispersed, and then pre-cool in a refrigerator at -20°C for 30 minutes. After the pre-cooling is completed, add the acidified fiber prepared above element, be made into a 5wt% solution to obtain a c...
Embodiment 2
[0049] A cellulose-based doped carbon aerogel for soil heavy metal passivation and a preparation method thereof, the specific steps are as follows:
[0050] Get 6g pine sawdust to pulverize, cross 80 mesh sieves, be immersed in the NaClO that concentration is 3.5wt% pH value is 6 2 Heat and stir at 80°C in the solution for 3h, centrifuge and wash until neutral, heat at 70°C in 5wt% KOH solution, stir for 2.5h, centrifuge, wash until neutral, and dry to obtain pine cellulose;
[0051] Pine wood cellulose was stirred and acidified in 150mL of 30wt% nitric acid at 40°C for 3.0h, washed to neutrality, and then placed in a fiber dissolving solution prepared according to the ratio of sodium hydroxide, urea, and water at a ratio of 7:12:81. Sonicate until completely dispersed, and prepare a 4wt% acidified cellulose dispersion;
[0052] Add 0.50 g of melamine to the acidified cellulose dispersion, stir evenly, add 0.35 g of toluene-2,4-diisocyanate at 40°C for 3.0 hours of cross-link...
Embodiment 3
[0058] A cellulose-based doped carbon aerogel for soil heavy metal passivation and a preparation method thereof, the specific steps are as follows:
[0059] Take 5.0g of recycled paper shells and crush them, pass through a 50-mesh sieve, stir in 200mL of 25wt% hydrochloric acid in hydrochloric acid at room temperature for 2.0h, centrifuge, wash until neutral, and dry;
[0060] Add the acidified paper fiber into the fiber dissolving liquid prepared according to the ratio of sodium hydroxide, urea, and water in the ratio of 7:12:81 by mass, ultrasonically until it is completely dispersed, and prepare a 4wt% acidified paper fiber dispersion;
[0061] Add 1.50g of urea to the acidified paper fiber dispersion, stir evenly, add 0.50g of N,N-methylenebisacrylamide, and react at 50°C for 2 hours to obtain a hydrogel;
[0062] The hydrogel was exchanged to neutral with 50% ethanol solution, and then freeze-dried for 48 hours after pre-cooling in a refrigerator at -20°C to obtain urea-d...
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