A kind of preparation method of chitosan/ferric hydroxide composite adsorbent adsorbing arsenic
A ferric hydroxide, composite adsorption technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve the effects of high adsorption effect, economical and environmentally friendly preparation method, and simple process route
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Embodiment 1
[0020] Dissolve 2 g of chitosan and 2 g of ferric chloride hexahydrate in 96 g of deionized water, heat and stir in a water bath at 90 °C for 1 h, so that the chitosan is completely dissolved, and the chitosan / ferric chloride aqueous solution can be obtained. Add 20 ml of 10wt% sodium hydroxide aqueous solution dropwise in the aqueous solution, continuously generate chitosan / iron hydroxide precipitation in the solution, wash the chitosan / iron hydroxide precipitation with deionized water repeatedly, and then wash the resulting flocculation The solidified material was added to 30 ml of 5 wt% glutaraldehyde solution for cross-linking at 30 °C for 2 h, and the resulting product was dried in a freeze-drying agent for 24 h, that is, chitosan / ferric hydroxide composite adsorbent.
Embodiment 2
[0022] Dissolve 5.0 g of chitosan and 3.0 g of ferric chloride hexahydrate in 92 g of deionized water, heat and stir in a water bath at 90 °C for 2 h to completely dissolve chitosan, and prepare a chitosan / ferric chloride aqueous solution. Add the 5wt% sodium hydroxide aqueous solution of 80 ml dropwise in the solution, can constantly generate chitosan / iron hydroxide precipitation in the solution, the chitosan / iron hydroxide precipitation is rinsed repeatedly with deionized water, then the gained The floc was added to 50 ml of 10 wt% glutaraldehyde solution and cross-linked at 40 °C for 1.5 h, and the resulting product was dried in a freeze dryer for 24 h to obtain the chitosan / iron hydroxide composite adsorbent.
Embodiment 3
[0024] Take 3.0 g of chitosan and 2.0 g of ferric chloride hexahydrate dissolved in 95 g of deionized water, and heat and stir in a water bath at 90 °C for 1 h. Chitosan is completely dissolved, and chitosan / ferric chloride aqueous solution is prepared, and then 60 ml of 5 wt% sodium hydroxide aqueous solution is added dropwise to the solution, and chitosan / ferric hydroxide precipitation will be continuously generated in the solution , the chitosan / ferric hydroxide precipitate was washed repeatedly with deionized water, and then the floc obtained was added to 30 ml of 10 wt% glutaraldehyde solution for cross-linking at 60 °C for 1 h, and deionized The unreacted glutaraldehyde was washed repeatedly with water to remove the unreacted glutaraldehyde, and the resulting product was dried in a freeze dryer for 24 h to obtain the chitosan / iron hydroxide composite adsorbent.
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