Energy-saving nanofiltration membrane for water purification system and preparation method of energy-saving nanofiltration membrane
A water purification system and nanofiltration membrane technology, applied in the field of water treatment, can solve the problems of inability to guarantee the safety of drinking water and effective removal, and achieve the effect of avoiding osmotic resistance, avoiding a large increase, and efficiently intercepting
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[0029] Example 1:
[0030] A dense nanofiltration membrane with a non-woven fabric layer, a polysulfone support layer and a polyamide layer is prepared according to a conventional method.
[0031] Firstly, the polysulfone microporous membrane composed of a non-woven fabric and a polysulfone support layer was immersed in an aqueous solution containing 1 wt% m-phenylenediamine, and the excess solution on the surface was removed with a rubber roller. The organic phase solution of 1 wt% trimesoyl chloride was contacted for 1 minute, and heat-treated in an oven at 70°C for 5 minutes to obtain a dense nanofiltration membrane.
[0032] Then, the dense nanofiltration membrane was immersed in 0.5% NaOH aqueous solution, after 5 minutes, it was taken out and rinsed and contacted with polyethyleneimine-containing aqueous solution for 1 minute, and the excess aqueous solution on the surface was removed with 1.0% mass fraction. The glutaraldehyde aqueous solution is cross-linked and heat-treated...
Example Embodiment
[0034] Example 2:
[0035] A dense nanofiltration membrane with a non-woven fabric layer, a polysulfone support layer and a polyamide layer is prepared according to a conventional method.
[0036] Firstly, the polysulfone microporous membrane composed of a non-woven fabric and a polysulfone support layer was immersed in an aqueous solution containing 1 wt% m-phenylenediamine, and the excess solution on the surface was removed with a rubber roller. The organic phase solution of 1 wt% trimesoyl chloride was contacted for 1 minute, and heat-treated in an oven at 70°C for 5 minutes to obtain a dense nanofiltration membrane.
[0037] Then, the dense nanofiltration membrane was immersed in 0.5% KOH aqueous solution, after 5 minutes, it was taken out and rinsed and contacted with polyethyleneimine-containing aqueous solution for 1 minute, and the excess aqueous solution on the surface was removed with 1.0% mass fraction. The glutaraldehyde aqueous solution is cross-linked and heat-treated ...
Example Embodiment
[0039] Example 3:
[0040] A dense nanofiltration membrane with a non-woven fabric layer, a polysulfone support layer and a polyamide layer is prepared according to a conventional method.
[0041] Firstly, the polysulfone microporous membrane composed of a non-woven fabric and a polysulfone support layer was immersed in an aqueous solution containing 1 wt% m-phenylenediamine, and the excess solution on the surface was removed with a rubber roller. The organic phase solution of 1 wt% trimesoyl chloride was contacted for 1 minute, and heat-treated in an oven at 70°C for 5 minutes to obtain a dense nanofiltration membrane.
[0042] Then the dense nanofiltration membrane was immersed in 0.5% aqueous ammonia solution, after 5 minutes, it was taken out after rinsing and contacted with the aqueous solution containing polyethyleneimine for 1 minute, and the excess aqueous solution on the surface was removed with 1.0% mass fraction The glutaraldehyde aqueous solution is cross-linked and heat...
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