Functionalized airgel with heavy metal ion adsorption and desorption and preparation method
A heavy metal ion, functionalization technology, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problem of low adsorption and desorption capacity of heavy metal ions, etc. , the effect of low density and large specific surface area
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[0024] see figure 1 , the figure is a flow chart of a preferred embodiment of the preparation method of a functionalized airgel with heavy metal ion adsorption and desorption of the present invention, which includes steps:
[0025] S1. Ultrasonic treatment is performed on graphite oxide to form a uniform graphene oxide dispersion;
[0026] S2, adding a complex compound with heavy metal complexation to the graphene oxide dispersion, and stirring to form a uniform mixed solution;
[0027] S3, heating the mixed solution to obtain a functionalized hydrogel modified by the complex compound;
[0028] S4, performing solvent replacement on the functionalized hydrogel, and then drying to obtain a functionalized aerogel with heavy metal ion adsorption and desorption capacity.
[0029] In the present invention, a complex compound with heavy metal complexation is added to the graphene oxide dispersion, so that the graphene oxide grafts the complex compound, so that the graphene-based ai...
Embodiment 1
[0040] Example 1: Weigh 45 mg of graphite oxide into a 50 ml beaker, add 15 ml of deionized water, and ultrasonicate for 15 minutes at a power of 300 W to form a uniform graphene oxide dispersion. Add 45mg of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt into this system, and stir for 10min to form a uniformly dispersed mixed solution. Pour it into a high-pressure reactor, put the high-pressure reactor in an electric blast drying oven, and react at 180° C. for 12 hours to obtain an EDTA-modified functionalized hydrogel.
[0041]After the reaction, cool down to room temperature, carefully pour into a beaker filled with deionized water to replace the solvent, change the water every 3 hours, and replace for 48 hours until the pH value of the leached solution is neutral, and drain the excess water on the surface. Quick-frozen in liquid nitrogen for 20 minutes, and dried in a freeze dryer at -50°C for 48 hours to obtain a functionalized airgel with heavy metal ...
Embodiment 2
[0042] Example 2: Weigh 45 mg of graphite oxide into a 50 ml beaker, add 15 ml of mixed solution (deionized water: ethanol = 1:1, volume ratio), and ultrasonicate for 15 min at a power of 300 W to form a uniform graphene oxide dispersion. Add 45mg of N-(trimethoxysilylpropyl)ethylenediaminetriacetic acid sodium salt into this system, and stir for 10min to form a uniformly dispersed mixed solution. Pour it into a high-pressure reactor, put the high-pressure reactor in an electric blast drying oven, and react at 160° C. for 12 hours to obtain an EDTA-modified functionalized hydrogel.
[0043] After the reaction, cool down to room temperature, carefully pour into a beaker filled with deionized water to replace the solvent, change the water every 3 hours, and replace for 48 hours until the pH value of the leached solution is neutral, and drain the excess water on the surface. Quick-frozen in liquid nitrogen for 20 minutes, and dried in a freeze dryer at -50°C for 48 hours to obtai...
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