Method for preparing cellulose composite aerogel by taking reed as raw material
A composite airgel and cellulose technology, which is applied in the direction of pulping with inorganic alkali, pulping with acid acid/acid anhydride, pulping with halogen compounds, etc., can solve the problems of poor selectivity and low adsorption capacity, and achieve the removal effect Enhance, enrich porosity, and enrich the effect of three-dimensional network cross-linked structure
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[0028] (2) Preparation of cellulose / chitosan composite aerogel
[0029] Weigh 0.25-1 g of the cellulose extracted in step 1, dissolve it in a mixed solution of sodium hydroxide / urea / water pre-cooled at -12°C to -30°C, and rapidly stir at 1000-1500 r / min for 3-10 min to obtain a light yellow cellulose solution. The chitosan solution was also prepared according to the above procedure to obtain a transparent solution. The two solutions were then frozen for 10 to 15 hours in a -12°C to -30°C refrigerator. After thawing at room temperature, weigh a certain mass of cellulose and chitosan solution (mass ratio is 1:1 to 1:5), stir well and add 1-5 mL of epichlorohydrin cross-linking agent, at -3 °C ~ 3 ℃ cross-linking 0.5 ~ 2h. After the reaction, the mixed solution was poured into a specific mold, and heated in a water bath at 50-70° C. for 1-3 hours. Finally, the composite hydrogel was washed with a large amount of water until neutral, and freeze-dried in a freeze dryer for 12-3...
Embodiment 1
[0031] Cut the reed straw, put it into a pulverizer for crushing, and pass it through a 100-mesh sieve. 10 g of reed powder was taken, put into deionized water, stirred at room temperature for 2 hours, filtered with suction, and dried in an oven at 60°C for use. The pretreated reed was added to an appropriate amount of sodium hydroxide solution, treated at 70 °C for 2 h, filtered with suction and washed with deionized water until neutral. Then, the alkali-treated product was added to dilute hydrochloric acid solution, treated at 70 °C for 2 h, suction filtered, and washed with deionized water until neutral. Finally, the acid-treated product was put into a sodium hypochlorite / acetic acid solution for bleaching, and treated at 80°C for 3 hours. This operation was repeated several times until white cellulose was obtained. The scanning electron microscope (SEM) images of the reed raw materials and cellulose used are as follows figure 1 As shown in the figure, it can be seen from...
Embodiment 2
[0036] A certain amount of cellulose extracted in Example 1 was weighed, dissolved in a pre-cooled mixed solution of sodium hydroxide / urea / water, and stirred rapidly for a few minutes to prepare a 5wt% cellulose solution. Similarly, a certain amount of chitosan was weighed and dissolved in the above system to prepare a 5wt% chitosan solution. Subsequently, the two solutions were frozen for 12 h, and after thawing at room temperature, the two solutions were mixed in a mass ratio of 1:2, an appropriate epichlorohydrin cross-linking agent was added, and the mixture was stirred at 0 °C for 1 h. After the reaction, the mixed solution was poured into the mold and heated at 60 °C for 2 h to obtain the composite hydrogel. The hydrogel was washed with a large amount of deionized water until neutral, and lyophilized in a freeze dryer for 24 h to obtain a cellulose / chitosan composite aerogel, referred to as CE / CSA-2.
[0037] The SEM image of the gel is shown in figure 2 d shown.
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