A preparation method of chitosan/aluminum hydroxide composite adsorbent for adsorbing fluorine
An aluminum hydroxide and composite adsorption technology, applied in the environmental field, can solve problems such as the introduction of chloride ions, and achieve the effect of protection without degradation, simple process route, and good non-degradation.
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Embodiment 1
[0023] Dissolve 1.0 g of chitosan and 0.5 g of aluminum chloride hexahydrate in 48.5 g of deionized water, heat and stir in a water bath at 90°C for 2 hours to completely dissolve the chitosan, and prepare a chitosan / aluminum chloride aqueous solution. Add 15 ml of 10 wt% sodium hydroxide aqueous solution dropwise to the solution. The chitosan / aluminum hydroxide precipitate will continue to form in the solution. The chitosan / aluminum hydroxide precipitate is washed repeatedly with deionized water, and then The obtained floccules were added to 15 ml of 10 wt% glutaraldehyde solution for cross-linking at 40°C for 2 h, and the resulting product was dried in a freeze dryer for 24 h to obtain a chitosan / aluminum hydroxide composite Adsorbent.
Embodiment 2
[0025] Dissolve 1.0 g of chitosan and 1.0 g of aluminum nitrate hexahydrate in 48 g of deionized water, heat and stir in a water bath at 90°C for 2 hours to completely dissolve the chitosan, and prepare a chitosan / aluminum chloride aqueous solution. Add 15 ml of 10 wt% sodium hydroxide aqueous solution dropwise to the solution. The chitosan / aluminum hydroxide precipitates will continue to form in the solution. The chitosan / aluminum hydroxide precipitates are washed repeatedly with deionized water, and then the obtained The floccules were added to 15 ml of 10 wt% glutaraldehyde solution for cross-linking at 40°C for 2 h, and the resulting product was dried in a freeze dryer for 24 h to obtain chitosan / aluminum hydroxide composite adsorption Agent.
Embodiment 3
[0027] Take 1.5 g of chitosan and 1.5 g of aluminum chloride hexahydrate in 47 g of deionized water, heat and stir in a water bath at 90°C for 2 h to completely dissolve the chitosan, and prepare a chitosan / aluminum chloride aqueous solution. Add 25 ml of 10 wt% sodium hydroxide aqueous solution dropwise to the solution. Chitosan / aluminum hydroxide precipitates will continue to form in the solution. The chitosan / aluminum hydroxide precipitates are washed repeatedly with deionized water, and then The obtained floccules were added to 25 ml of 10 wt% glutaraldehyde solution for cross-linking at 60 ℃ for 2 h, and the obtained product was dried in a freeze dryer for 24 h to obtain chitosan / aluminum hydroxide composite Adsorbent.
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