Adsorption membrane for immobilizing fluoride ions and preparation method thereof
An adsorption membrane, fluoride ion technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc. Simple process and the effect of overcoming ion interference
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Embodiment 1
[0033] In conjunction with the accompanying drawings, a kind of adsorption film (such as figure 1 As shown), the hydrated alumina on the surface of the adsorption film is in the form of bundles, which can provide a large number of adsorption sites for fluoride ions. Through X-ray diffraction analysis, it can be seen that the hydrated alumina synthesized in this embodiment is boehmite (boehmite, γ-AlOOH, a kind of boehmite) (such as figure 2 Shown), this kind of alumina mineral has a large adsorption capacity for fluoride ions. The adsorption membrane of this embodiment is suitable for the adsorption and analysis of various fluoride ions in the water environment such as water body, soil and sediment interstitial water.
[0034] A kind of preparation method of the adsorption film of fixing fluorine ion of the present embodiment, concrete steps are:
[0035] Step 1. Synthesis of hydrated alumina powder: prepare 30 mL of aluminum nitrate solution and urea solution with concentr...
Embodiment 2
[0040] The preparation method of an adsorption membrane for immobilizing fluoride ions in this embodiment is basically the same as that in Example 1, the difference is that in this embodiment, during the preparation of an adsorption membrane for immobilizing fluoride ions:
[0041] In step 1, the concentrations of the aluminum nitrate solution and the urea solution are 0.3 mol / L and 0.6 mol / L respectively, the hydrothermal reaction time is 4 hours, the centrifugal speed is 3000 rpm, and the number of repetitions is 2 times.
[0042] The volumes of 10% ammonium persulfate solution and tetramethyldiethylamine added in Step 3 were 36 μL and 3 μL, respectively.
[0043] The adsorption membrane prepared in this example, the polyacrylamide diffusion membrane and the polyethersulfone filter membrane were assembled into a DGT device, which was placed in three different sampling points of a freshwater lake in Jiangsu for 1 day. Sampling 100mL water samples were taken respectively. Aft...
Embodiment 3
[0047] The preparation method of an adsorption membrane for immobilizing fluoride ions in this embodiment is basically the same as that in Example 1, the difference is that in this embodiment, during the preparation of an adsorption membrane for immobilizing fluoride ions:
[0048] In the first step, the concentrations of the aluminum nitrate solution and the urea solution are 0.5 mol / L and 1.0 mol / L respectively, the hydrothermal reaction time is 8 hours, and the centrifugal speed is 3500 rpm.
[0049] The volumes of 10% ammonium persulfate solution and tetramethyldiethylamine added in Step 3 were 42 μL and 6 μL, respectively.
[0050] Collect 2 local fluorine-contaminated groundwater in Xuzhou, Jiangsu, both of which have a volume of 2L, put them into a plastic container, stir and mix the solution fully, put it into the plexiglass frame of the circular DGT device with the adsorption film of this embodiment stuck, and after 4 hours Take out the DGT device and elute the adsorb...
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Abstract
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