A kind of heavy metal ion sio in adsorption water body 2 /cComposite materials and their applications
A technology of heavy metal ions and composite materials, which is applied in the field of preparation of silica/carbon composite materials, can solve the problems of low density of adsorbent materials, affecting the recovery and reuse of adsorbents, poor mechanical properties and thermal stability of adsorbent materials, etc., and achieves The effect of good biocompatibility, good adsorption selectivity, and good adsorption effect
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Embodiment 1
[0040] (1) SiO 2 Preparation of / C composite material: Dissolve 0.9g of potato starch in 20mL of water, heat and dissolve at 100°C for 2h, then add 60mL of ethanol dropwise, after 0.5h, continue stirring for 1h to form a uniform gel dispersion system, cool to room temperature, then add 4mL ammonia water (mass fraction 25-28%) and 1mL tetraethyl orthosilicate (1mLTEOS containing SiO 2 0.25g), stirred evenly to obtain a white sol; it was hydrolyzed at room temperature for 1 h, then transferred to an autoclave for hydrothermal reaction at 180°C for 24 h, and finally, washed alternately with distilled water and absolute ethanol for 3-5 times, Dry in an oven at 80°C for 12 hours to obtain light brown SiO 2 / C Composite.
[0041] Depend on figure 1 It can be seen that the prepared SiO 2 The / C composite material has a structure of connecting spherical particles in a helical chain shape, the diameter of the helical chain is about 10-20nm, and the particle size of the ball is abou...
Embodiment 2
[0045] (1) SiO 2 Preparation of / C composite material: Dissolve 0.9g cornstarch in 40mL water, heat and dissolve at 100°C for 0.5h, then add 40mL ethanol drop by drop, after 1h, continue stirring for 0.5h to form a uniform gel dispersion system, Cool to room temperature, then add 0.6mL ammonia water (mass fraction is 25-28%) and 0.2mL tetraethyl orthosilicate (0.2mLTEOS contains SiO 2 0.05g), and stirred evenly to obtain a white sol; it was hydrolyzed for 1 hour under stirring at room temperature, then transferred to an autoclave for hydrothermal reaction at 180°C for 30 hours, and finally, washed alternately with distilled water and absolute ethanol for 3-5 times. Dry in an oven at 80°C for 12 hours to obtain light brown SiO 2 / C Composite.
[0046] (2) Adsorption experiment of heavy metal ions: Dissolve soluble salts of heavy metal ions in distilled water to prepare a heavy metal ion solution with a certain concentration, take 50 mL of the heavy metal ion solution and put ...
Embodiment 3
[0050] (1) SiO 2 Preparation of / C composite material: Dissolve 0.9g of potato starch in 20mL of water, heat and dissolve at 100°C for 24h, then add 60mL of ethanol dropwise, after 1h, continue stirring for 0.5h to form a uniform gel dispersion system, cool to room temperature, then add 4mL ammonia water (mass fraction 25-28%) and 1mL tetraethyl orthosilicate (1mLTEOS containing SiO 2 0.25g), stirred evenly to obtain a white sol; it was hydrolyzed at room temperature for 1 h, then transferred to an autoclave for hydrothermal reaction at 180°C for 24 h, and finally, washed alternately with distilled water and absolute ethanol for 3-5 times, Dry in an oven at 80°C for 12 hours to obtain light brown SiO 2 / C Composite. Depend on figure 2 It can be seen that the prepared SiO 2 / C composites have a porous bulk structure, due to the SiO 2 between particles, SiO 2 Stacking between carbon and carbon, between carbon and carbon, makes these massive structures have macropores, mes...
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