Adsorbent for adsorbing chromium, preparation method and adsorption method
A technology of adsorbent and templating agent, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of low adsorption capacity of adsorbent, complicated preparation process, high preparation cost, etc., achieve small change, Simple synthesis steps and short adsorption equilibrium time
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Embodiment 1
[0049] 1. Synthesis of amino-functionalized mesoporous silica nanomaterials
[0050]Add 2.0 g of cetyltrimethylammonium bromide, 90 mL of deionized water and 20 mL of ethylene glycol into a 250 mL round bottom flask, and stir the whole system magnetically at 600 rpm for 90 min. After the whole system is stirred evenly, add 3mL of ammonia water with a mass concentration of 28%. 6) Add to the reaction system, keeping the total volume of the two at 3 mL. After the feeding of the whole system was completed, it was heated in a water bath at 50°C and mechanically stirred at a speed of 600 rpm for 6 hours to complete the preliminary growth of nanoparticles. At this time, the solution appeared fluorescent blue under strong light. After that, continue to keep heating in a water bath at 50° C., adjust the mechanical stirring speed to 300 rpm, and stir in a water bath for 24 hours. After the reaction is completed, the prepared silica nanoparticles are recovered by centrifugation at a s...
Embodiment 2
[0057] 1. Synthesis of amino-functionalized mesoporous silica nanomaterials
[0058] Add 2.0 g of cetyltrimethylammonium bromide, 90 mL of deionized water and 20 mL of ethylene glycol into a 250 mL round bottom flask, and stir the whole system magnetically at 600 rpm for 90 min. After the whole system is stirred evenly, add 3 mL of ammonia water with a mass concentration of 28%. After the ammonia water is added, add tetraethyl silicate and 3-aminopropyltrimethoxysilane to the reaction system according to a certain volume ratio (4:1) , keep the total volume of the two constant at 3mL. After the feeding of the whole system was completed, it was heated in a water bath at 50°C and mechanically stirred at a speed of 600 rpm for 6 hours to complete the preliminary growth of nanoparticles. At this time, the solution appeared fluorescent blue under strong light. After that, continue to keep heating in a water bath at 50° C., adjust the mechanical stirring speed to 300 rpm, and stir i...
Embodiment 3
[0064] 1. Synthesis of amino-functionalized mesoporous silica nanomaterials
[0065] For the synthesis method of nanomaterials in this example, refer to Example 2 for details.
[0066] 2. Adsorption process of Cr(Ⅵ)
[0067] Preparation of Cr(VI)-containing solution: use 0.0999mol / L potassium dichromate standard solution, dilute it with deionized water to 400mg / L Cr(VI)-containing solution, add hydrochloric acid or sodium hydroxide solution to adjust the pH to 1 ~12.
[0068] The main form of Cr(Ⅵ) in aqueous solutions with different pH values is: at pH ≤ 7, Cr(Ⅵ) forms as HCrO 4 - 、Cr 2 o 7 2- Existence, as HCrO 4 - Mainly; at pH ≥ 7, Cr(Ⅵ) is CrO 4 2- 、HCrO 4 - exists, with CrO 4 2- Mainly. Take 10mL of the above-mentioned Cr(VI) solutions with different pH values in centrifuge tubes, add 10mg of the above-mentioned adsorbent, and adsorb for two hours at 25°C under mechanical vibration at 220rpm to ensure that the adsorbent is fully in contact with the wat...
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