Method of modifying polyolefin ultrafiltration membrane through polyaniline in-situ polymerization method
An in-situ polymerization and ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of organic matter and microbial contamination, poor permeability of separation membrane, high transmembrane pressure, etc., to maintain Membrane structure and mechanical properties, modification effect is permanently stable, and the effect of improving surface energy
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Embodiment 1
[0045] First, aniline was dissolved in an aqueous hydrochloric acid solution with a pH of 2 to prepare a 1 mol / L aniline modification solution. Sodium persulfate was dissolved in an aqueous hydrochloric acid solution with a pH of 2 to prepare a 0.01 mol / L ammonium persulfate initiator solution.
[0046] The polypropylene hollow fiber ultrafiltration membrane with a pore size of 30 to 50 nanometers prepared by the melt-spinning drawing method was immersed in a freshly prepared 0.05mol / L sodium dodecylbenzenesulfonate aqueous solution for 0.01 hour. The polypropylene hollow fiber ultrafiltration membrane soaked in surfactant was moved into the pre-prepared aniline modification solution, stirred at a slow speed, and carried out surface adsorption for 12 hours.
[0047] The polypropylene hollow fiber ultrafiltration membrane adsorbing aniline monomer was soaked in the pre-prepared ammonium persulfate initiator and stirred at a slow speed.
[0048] During the reaction, the color o...
Embodiment 2
[0050] First, aniline was dissolved in an acetic acid aqueous solution with a pH of 6 to prepare a 1 mol / L aniline modified solution. Sodium persulfate was dissolved in an aqueous acetic acid solution with a pH of 6 to prepare an ammonium persulfate initiator solvent of 0.01 mol / L.
[0051] The polypropylene hollow fiber membrane with a pore size of 50-100 nanometers prepared by a thermally induced phase separation method was soaked in a freshly prepared 1 mol / L sodium dodecylbenzenesulfonate aqueous solution for 24 hours. The polypropylene hollow fiber ultrafiltration membrane soaked in the surfactant was moved into the aniline modification solution, stirred at a slow speed, and carried out surface adsorption for 12 hours.
[0052] The polypropylene hollow fiber ultrafiltration membrane adsorbing aniline monomer was soaked in the pre-prepared ammonium persulfate initiator and stirred at a slow speed.
[0053] After the polymerization reaction was completed, the modified memb...
Embodiment 3
[0055] Dissolve aniline in an aqueous hydrochloric acid solution with a pH of 1 to prepare a 1 mol / L aniline modified solution. Dissolve sodium persulfate in an aqueous hydrochloric acid solution with a pH of 1 to prepare a 0.1 mol / L ammonium persulfate initiator solvent.
[0056] The polypropylene flat ultrafiltration membrane with a pore size of 30 to 50 nanometers prepared by thermally induced phase separation was soaked in a freshly prepared Tween 80 concentration of 0.05mol / L surfactant solution for 24 hours. After that, the polypropylene flat ultrafiltration membrane soaked in the surfactant was moved into the aniline modification solution, stirred at a slow speed, and carried out surface adsorption for 12 hours.
[0057] The polypropylene flat ultrafiltration membrane adsorbing aniline monomer was soaked in the pre-prepared ammonium persulfate initiator and stirred at a slow speed. After the polymerization reaction was completed, the modified membrane was taken out, an...
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