Uranium adsorbent applicable to alkaline environment and preparation method of uranium adsorbent
A technology of adsorbent and silane coupling agent, applied in the field of adsorbent and its preparation, to achieve the effects of increased adsorption capacity, convenient operation and simple preparation process
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Embodiment 1
[0045] (Trimethyl[3-(trimethoxysilyl)propyl]ammonium chloride)
[0046] (Diethylphosphorylethyltriethoxysilane)
[0047] 1) Weigh 1.5g of silicon dioxide and dry it under vacuum at 102°C for 12h;
[0048] 2) Add 0.52mL trimethyl[3-(trimethoxysilyl)propyl]ammonium chloride (density 0.927g / ml, ie mass 0.482g; molecular weight 258, ie moles 1.87×10 -3 mol) and 2.65mL diethylphosphorylethyltriethoxysilane (density 1.031g / ml, ie mass 2.732g; molecular weight 328, ie moles 8.33×10 -3 mol) was dissolved in 20 mL of dioxane at room temperature (25°C), and stirred evenly in an argon atmosphere to obtain a reaction system;
[0049] 3) Transfer the dried silicon dioxide to the reaction system, raise the temperature to 75°C, and react in an argon atmosphere for 24 hours;
[0050] 4) Filtering, washing and drying the obtained product to obtain the bifunctional organic-inorganic hybrid porous adsorbent 1.
[0051] from figure 1 Obtained in, the obtained adsorbent particle size in e...
Embodiment 2
[0054] 1) Weigh 1.5g of silicon dioxide and dry it under vacuum at 102°C for 12h;
[0055] 2) Dissolve 2.65mL of diethylphosphorylethyltriethoxysilane in 20mL of dioxane at room temperature (25°C), and stir evenly in an argon atmosphere to prepare a reaction system;
[0056] 3) Transfer the dried silicon dioxide to the reaction system, raise the temperature to 75° C., and react in an argon atmosphere for 24 hours.
[0057] 4) Filtering, washing and drying the obtained product to obtain organic-inorganic hybrid porous adsorbent 2 containing only phosphoryl monofunctional group.
Embodiment 3
[0059] Pipette two parts of 50mL uranium solution with an initial concentration of 100mg / L, adjust the pH of the solution to 9.5, add 0.2g of the adsorbents 1 and 2 prepared in Example 1 and Example 2 respectively, shake and balance at room temperature for 2h, and filter The concentration of uranium in the system before and after adsorption was analyzed by laser fluorescence method, so as to calculate the amount of uranium adsorbed.
[0060] Depend on image 3 It can be seen that in the alkaline environment of pH=9.5, the adsorption effect of uranium on the adsorbent 1 containing bifunctional groups (saturated adsorption capacity: 42 mg / g) is significantly better than that of the adsorbent containing only phosphoryl uranium complex functional groups 2 (saturated adsorption capacity: 0.8 mg / g). This is due to the electrostatic attraction between the positive charge contained in the adsorbent 1 and the negatively charged uranium hydrolyzate in the alkaline environment, which pl...
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Abstract
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