Negatively charged composite nanofiltration membrane and preparation method thereof
A composite nanofiltration membrane, negatively charged technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex preparation process, long reaction time, difficult to realize industrialized production, etc., and achieve a simple preparation method. , The effect of short preparation cycle and low price
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Embodiment 1
[0033] This embodiment provides a negatively charged composite nanofiltration membrane and a preparation method thereof, the preparation method comprising the following steps:
[0034] Step 1: Add 1.5 g of sulfonated chitosan (viscosity-average molecular weight: 75,000 Da) with a sulfonation degree of 20% to 50 mL of deionized water, stir to dissolve it, and filter with suction to obtain an aqueous phase solution;
[0035] Step 2: Soak the porous ultrafiltration basement membrane polysulfone (PS) in the aqueous phase solution for 5 minutes;
[0036] Step 3: remove excess aqueous phase solution, and place the film in a thermostat for drying;
[0037] Step 4: Add 0.15 g of trimesoyl chloride (TMC) into 50 mL of n-hexane and stir to fully dissolve it to obtain an organic phase solution;
[0038] Step 5: Soak the dried film in the oil phase (organic phase) solution for 2 minutes;
[0039] Step 6: remove excess organic phase solution, and place the film in a thermostat at 60°C fo...
Embodiment 2
[0046] The present embodiment provides a negatively charged composite nanofiltration membrane and a preparation method thereof, which are basically the same as in Example 1, except that in step 1, 1.5 g of sulfonated chitosan (viscosity average molecular weight) with a sulfonation degree of 30% is provided. : 68,000Da) was added into 50mL of deionized water and stirred to dissolve, and then a negatively charged composite nanofiltration membrane was obtained.
[0047] The preparation method of the above-mentioned sulfonated chitosan with a sulfonation degree of 30% is basically the same as that of Example 1, the difference is that the chlorosulfonic acid is 90 mL; the sulfonation reaction time is 12 hours.
[0048] Test the negatively charged composite nanofiltration membrane in this embodiment 2 to the Na of 1000ppm 2 SO 4 R and F of the aqueous solution, the results are shown in Table 1.
Embodiment 3
[0050] This embodiment provides a negatively charged composite nanofiltration membrane and a preparation method thereof, which are basically the same as in Example 1, except that in step 4, 0.15 g of isophthaloyl chloride (IPC) is added to 50 mL of n-hexane and stirred Make it fully dissolved, and then obtain the negatively charged composite nanofiltration membrane.
[0051] Test the negatively charged composite nanofiltration membrane in this embodiment 3 to the Na of 1000ppm 2 SO 4 R and F of the aqueous solution, the results are shown in Table 1.
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