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Preparation method of nano fiber affinity membrane for absorbing and separating La3+

A nanofiber membrane and nanofiber technology are applied in the field of preparation of nanofiber affinity membranes, which can solve problems such as loss of coordination, and achieve the effects of low cost, simple and easy preparation method, and large-scale production operation.

Inactive Publication Date: 2013-11-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since only the ligands on the surface of the fiber can contact with the target body and perform the coordination function, and the ligands in the fiber lose the opportunity to contact the target body due to the coating effect, thus losing the coordination effect

Method used

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  • Preparation method of nano fiber affinity membrane for absorbing and separating La3+
  • Preparation method of nano fiber affinity membrane for absorbing and separating La3+
  • Preparation method of nano fiber affinity membrane for absorbing and separating La3+

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Dissolve 10g of polyacrylonitrile PAN in 90g of N,N'-dimethylformamide DMF, then add 25g of poly-N-vinylpyrrolidone PVP, and stir at 60°C for 48 hours to obtain a uniform, Transparent electrospinning solution; the spinning solution is added to the container, extruded by a micro-injection pump, the nozzle is connected to a high-voltage positive electrode, the electrospinning parameters are voltage 25KV, nozzle aperture 1.5mm, solution flow rate 1.5ml / h, environment The temperature was 25°C, the air relative humidity was 35%, and electrospinning was performed. The obtained PAN-PVP composite nanofibers had an average diameter of 500 nm, a deposition thickness of 100 μm, and a porosity of 93%.

[0034] (2) Soak the PAN-PVP composite nanofiber membrane obtained in (1) into deionized water, adjust pH=5.0 with HCl, soak at 95°C for 48h, take out the membrane, wash it with deionized water, and dry Dry to obtain a nanofibrous membrane with a porous, micro-nano structure, tes...

Embodiment 2

[0039] (1) Dissolve 20g polyacrylonitrile PAN in 70g N,N'-dimethylformamide DMF, then add 10g sodium bicarbonate NaHCO 3 , stirred at 50°C for 24 hours to obtain a uniform electrospinning solution with a concentration of 30%; the spinning solution was added to the container, and extruded by a micro-injection pump, the nozzle was connected to a high-voltage positive electrode, and the electrospinning parameter was voltage 25KV, nozzle aperture 1.5mm, solution flow rate 1.5ml / h, ambient temperature 25°C, air relative humidity 35%, electrospinning, the obtained PAN-NaHCO 3 The composite nanofibers have an average diameter of 450 nm, a deposition thickness of 100 μm, and a porosity of 90%.

[0040] (2) The PAN-NaHCO obtained in (1) 3 Soak the composite nanofiber membrane in deionized water, adjust the pH=3.0 with HCl, soak at 65°C for 24 hours, take out the membrane, wash it with deionized water, and dry it to obtain a nanofiber membrane with a porous, micro-nano structure , tes...

Embodiment 3

[0045](1) Dissolve 20g of polyacrylonitrile PAN in 80g of N,N'-dimethylformamide DMF, then add 20g of ethylene oxide PEO, and stir at 60°C for 48h to obtain a uniform and transparent static electricity with a concentration of 33.3%. Spinning solution: Add the spinning solution into the container, and extrude under the control of a micro-injection pump. The nozzle is connected to a high-voltage positive electrode. The electrospinning parameters are voltage 25KV, nozzle aperture 1.5mm, solution flow rate 1.5ml / h, and ambient temperature 25° C, the air relative humidity is 35%, electrospinning is carried out, the average diameter of the obtained PAN-PEO composite nanofiber is 600nm, the deposition thickness is 100μm, and the porosity is 90%.

[0046] (2) Soak the PAN-PEO composite nanofiber membrane obtained in (1) into deionized water, adjust pH=5.0 with HCl, soak at 90°C for 48h, take out the membrane, wash it with deionized water, Drying to obtain a nanofibrous membrane with a...

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Abstract

The invention relates to a preparation method of a nano fiber affinity membrane for absorbing and separating La3+. The preparation method comprises following steps: making a polymer solution go through electrostatic spinning to obtain a compound nano fiber membrane, processing the fiber membrane to obtain a porous, micro-nanostructure and high specific surface area nano fiber membrane, subjecting the nano fiber membrane to an amination treatment to obtain a porous, micro-nanostructure and high specific surface area aminated nano fiber membrane, subjecting the aminated nano fiber membrane to a treatment with a calixarene derivative solution and obtaining the product. The affinity membrane prepared according to the method mentioned above has a selective absorption property on La3+, is capable of regenerating, and the absorption effect is not affected after the membrane has been recycled for several times. The affinity membrane can be used in the absorption, extraction and separation technologies in mineral smelting and water processing industries.

Description

technical field [0001] The invention belongs to the field of preparation of polymer adsorption and separation affinity membranes, in particular to a method for adsorption and separation of La 3+ Preparation method of nanofiber affinity membrane. Background technique [0002] The rare earth element La widely exists in nature, and the materials made of it include luminescent materials, catalytic materials, optical fibers, storage materials, resistance materials, laser materials, superconducting materials, dielectric materials, etc., and are widely used in electronics, communications, new Important national economic fields such as energy, automobile, chemical industry and medicine, as well as aerospace and national defense construction. However, in the process of development and utilization of rare earth resources in my country, there are serious problems such as low industrial concentration, extensive mining methods, serious waste of resources, prominent environmental polluti...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30B01J20/28B01D67/00B01D71/82B01D69/02
Inventor 王雪芬洪贵山王敏李雄神领弟杨寅
Owner DONGHUA UNIV
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