Nanofiber membrane with heavy metal absorption function and preparation method thereof
A nanofiber membrane and heavy metal technology, applied in the field of membrane materials, can solve the problems of limited adsorption capacity of metal ions, and achieve the effects of high-efficiency adsorption of heavy metal ions, high grafting rate, and large specific surface area
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[0025] The preparation method comprises the following steps:
[0026] Preparation of a nanofibrous membrane with heavy metal adsorption function:
[0027] Preparation of A Polyolefin Copolymer Nanofiber Membrane
[0028] The preparation method adopts the preparation method of Chinese Patent Publication No. CN 101553607A, that is, PVA-co-PE and cellulose acetate butyrate (CAB) are uniformly mixed according to the mass ratio of 1:4, and dried. Melt blending and extruding through a twin-screw extruder, and after collection, the CAB is extracted by refluxing acetone at 60° C. for 72 hours to obtain nanofibers with a fiber diameter of ≤200 nm.
[0029] The PVA-co-PE nanofiber extracted with acetone is dispersed in a certain solvent with a mass fraction of 1% to 5% to prepare a nanofiber suspension. Then, the nanofiber suspension is formed on various fiber fabrics by using high-pressure airflow forming technology to obtain the PVA-co-PE nanofiber membrane.
[0030] Preparation of...
Embodiment 1
[0047] According to the above method, the prepared PVA-co-PE nanofiber membrane was immersed in 2mol / L sodium hydroxide and stirred evenly, the immersion temperature was 25°C, and the immersion time was 35min. After taking it out, immerse it in a 1,4-dioxane solution of cyanuric chloride with a mass fraction of 10% and stir evenly. The immersion temperature is 50° C., and the immersion time is 120 minutes. Take it out, wash it, and dry it to obtain active PVA- co-PE nanofiber membrane.
[0048] Prepare a sodium hydroxide solution with a concentration of 5mol / L, take 30ml of the sodium hydroxide solution as a solvent, prepare a solution of iminodiacetic acid with a concentration of 5mol / L, and impregnate the obtained active PVA-co-PE nanofiber membrane in the iminodiacetic acid Diacetic acid solution and uniform agitation, immersion temperature is 50 ℃, immersion time is 2 hours. After taking it out, wash it three times with 0.1 mol / L sodium hydroxide solution and water respec...
Embodiment 2
[0050] According to the above method, the prepared PVA-co-PE nanofiber membrane was immersed in 2mol / L sodium hydroxide solution and stirred evenly, the immersion temperature was 50°C, and the immersion time was 60min. After taking it out, immerse it in the 1,4-dioxane solution of cyanuric chloride with a mass fraction of 5% and stir evenly, the immersion temperature is 50°C, and the immersion time is 120min, take it out, wash it, and dry it to obtain active PVA- co-PE nanofiber membrane.
[0051] Preparation concentration is 5mol / L sodium hydroxide solution, gets 30ml sodium hydroxide solution as solvent, preparation concentration is the solution of the iminodiacetic acid of 0.05mol / L, will obtain active PVA-co-PE nanofibrous film impregnation in the Aminodiacetic acid solution and uniform stirring, immersion temperature is 70 ℃, immersion time is 3 hours. After taking it out, wash it three times with 0.1 mol / L sodium hydroxide solution and water respectively, and obtain the...
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