Mixed aerogel and preparation method and application thereof
A mixed gas and aerogel technology, applied in chemical instruments and methods, alkali metal compounds, and other chemical processes, can solve the problems of pure aerogels such as hydrophilicity, poor structural stability, and plasticity, and achieve extremely easy degradation , reduce toxicity, wide application prospects
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Embodiment 1
[0025] 1. Preparation of Hybrid Airgel
[0026] A hybrid aerogel was prepared by introducing nanomaterial graphene oxide into gellan gum by sol-gel-freeze-drying method. Specific steps are as follows:
[0027] (1) Dissolve 0.5-1g of gellan gum in 50mL of deionized water, then mechanically stir for 2 hours to obtain a 0.01-0.02g / mL gellan gum solution;
[0028] (2) Mix according to the mass ratio of gellan gum and graphene oxide at 5-10:1, that is, take 5 mL of gellan gum solution and add 5 mL of 2 mg / mL graphene oxide solution (purchased from Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences ), then ultrasonically stirred in an ultrasonic cleaner for 30min to obtain a homogeneous mixture;
[0029] (3) The mixture was pre-cooled at -80°C to -20°C for 5 hours, and then freeze-dried for 40 hours to obtain a mixed airgel.
[0030] 2. Characterization of hybrid airgel
[0031] 2.1 Specific volume determination of hybrid aerogels
[0032] The specific volume (1 / ρ)...
Embodiment 2
[0076] 1. Preparation of Hybrid Airgel
[0077] A hybrid aerogel was prepared by introducing nanomaterial graphene oxide into gellan gum by sol-gel-freeze-drying method. Specific steps are as follows:
[0078] (1) Dissolve 1 g of gellan gum in 50 mL of deionized water, then mechanically stir for 2 hours to obtain a 0.02 g / mL gellan gum solution;
[0079] (2) Mix according to the mass ratio of gellan gum and graphene oxide as 10:1, that is, take 5 mL of gellan gum solution and add 5 mL of 2 mg / mL graphene oxide solution, and then ultrasonically stir in an ultrasonic cleaner for 30 min, obtain a homogeneous mixture;
[0080] (3) The mixture was pre-cooled at -20°C for 5 hours, and then freeze-dried for 40 hours to obtain a mixed airgel.
[0081] 2. Research on the properties of hybrid airgel
[0082] 2.1 Degradation properties of hybrid aerogels
[0083] Put a certain mass of mixed airgel into 50% HCl and 1mol / L NaOH solution, let it stand for a while, and observe the chang...
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