Biological pollution resistant reverse osmosis composite membrane and preparation method thereof
A reverse osmosis composite membrane, anti-biological pollution technology, applied in the field of membrane separation, can solve the problems of long-term effectiveness and bactericidal performance decline, secondary pollution of feed liquid, membrane layer material shedding, etc., achieve excellent anti-adhesion performance, prevent microorganisms Pollution, the effect of excellent antibacterial properties
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Embodiment 1
[0028] A preparation method of an anti-biological fouling reverse osmosis composite membrane, comprising the following steps:
[0029] (1) The polysulfone membrane was contacted with an aqueous solution of 0.2 g / L tannic acid for 10 min;
[0030] (2) contacting the film obtained in step (1) with a ferric nitrate aqueous solution with a concentration of 3g / L for 30s; washing with pure water;
[0031] (3) the film obtained in step (2) is contacted with a silver nitrate aqueous solution of 5 g / L for 1 min and cleaned with pure water;
[0032] (4) contacting the film obtained in step (3) with a 0.2 wt% m-phenylenediamine aqueous solution for 5 minutes to remove residual liquid;
[0033] (5) Contact the film obtained in step (4) with a n-heptane solution of 1 wt % 1,3,5-benzenetricarboxylic acid chloride for 0.1 min, remove the residual liquid, dry in air at room temperature, soak in pure In water, an anti-biological fouling reverse osmosis composite membrane is obtained.
Embodiment 2
[0035] A preparation method of an anti-biological fouling reverse osmosis composite membrane, comprising the following steps:
[0036] (1) The polysulfone membrane was contacted with an aqueous solution of 1 g / L tannic acid for 0.5 min;
[0037] (2) contacting the film obtained in step (1) with a concentration of 0.1g / L ferric chloride aqueous solution for 300s; washing with pure water;
[0038] (3) The film obtained in step (2) was contacted with an ammonia solution of silver nitrate with a concentration of 0.2 g / L for 60 minutes and washed with pure water; the ammonia solution was ammonia water with a mass concentration of 2%.
[0039] (4) contacting the film obtained in step (3) with a 5wt% o-phenylenediamine aqueous solution for 2 minutes to remove residual liquid;
[0040] (5) The film obtained in step (4) was contacted with a cyclohexane solution of 0.01 wt% 1,2,4,5-pyrenetetracarbonyl chloride for 5 minutes to remove the remaining liquid, and dried in air at room tempe...
Embodiment 3
[0042] A preparation method of an anti-biological fouling reverse osmosis composite membrane, comprising the following steps:
[0043] (1) The polysulfone membrane is contacted with an aqueous solution of 5 g / L of tannic acid for 0.5 min;
[0044] (2) contacting the film obtained in step (1) with an aqueous ferric sulfate solution with a concentration of 0.1 g / L for 30 seconds; washing with pure water;
[0045] (3) The membrane obtained in step (2) is contacted with a silver nitrate aqueous solution of 1 g / L for 3 min, and cleaned with pure water;
[0046] (4) contacting the film obtained in step (3) with a p-phenylenediamine aqueous solution having a concentration of 3 wt % for 2 minutes to remove residual liquid;
[0047] (5) The film obtained in step (4) was contacted with the Isopar G solution of 0.5 wt% 1,3-phthaloyl chloride for 2 minutes to remove the residual liquid, dried in air at room temperature, and soaked in pure water , to obtain an anti-biological fouling rev...
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