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Metal adsorption fiber membrane and preparation and application thereof

A technology for adsorbing fibers and metals, which is applied in the field of fiber membrane materials, can solve the problems of difficult adsorption performance and structural stability, and achieve excellent chelation effect, good metal ion capture ability and selectivity, and unique selectivity.

Active Publication Date: 2022-06-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the adsorption performance and structural stability of the existing metal adsorption fiber membrane (metal adsorption membrane) are difficult to balance, the first purpose of the present invention is to provide a metal adsorption fiber membrane with a new structure, aiming to provide a metal adsorption fiber membrane with Fibrous membrane material with good metal adsorption properties and mechanical stability

Method used

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  • Metal adsorption fiber membrane and preparation and application thereof
  • Metal adsorption fiber membrane and preparation and application thereof
  • Metal adsorption fiber membrane and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (1) Preparation of PAN solution

[0075] The PAN solution is prepared by uniformly mixing polyacrylonitrile with a molecular weight of 150,000 and solvent N,N-dimethylacetamide according to weight percentages of 12wt% and 88wt% at 60°C.

[0076] (2) Preparation of PVDF solution

[0077] The PVDF solution is prepared by mixing 12wt% and 88wt% of PVDF with a model of 6020 and a solvent N,N-dimethylacetamide at normal temperature.

[0078] (3) Preparation of base film

[0079] The film casting liquid obtained in step (1) (2) was loaded into a 10mL syringe respectively, and a coaxial needle was connected with a Teflon catheter. The flow rate of the casting liquid was 0.5 mL / h, the winding speed of the drum was 300 rn / min, and the base film was obtained for 2 hours.

[0080] (4) Preparation of composite nanofiber membrane

[0081] With the base film of step (3) gained and the mixed solution of 100mL hydroxylamine hydrochloride and anhydrous sodium carbonate (wherein, the...

Embodiment 2

[0086] Compared with Example 1, the main difference is that the voltage of the spinning process is adjusted:

[0087] (1) Preparation of PAN solution

[0088] The PAN solution is prepared by uniformly mixing polyacrylonitrile with a molecular weight of 150,000 and solvent N,N-dimethylacetamide according to weight percentages of 12wt% and 88wt% at 60°C.

[0089] (2) Preparation of PVDF solution

[0090] The PVDF solution is prepared by mixing 12wt% and 88wt% of PVDF with a model of 6020 and a solvent N,N-dimethylacetamide at normal temperature.

[0091] (3) Preparation of base film

[0092]The film casting liquid obtained in step (1) (2) was put into a 10mL syringe respectively, and a coaxial needle was connected with a Teflon catheter. The flow rate of the casting liquid was 0.5 mL / h, the winding speed of the drum was 300 rn / min, and the base film was obtained for 2 hours.

[0093] (4) Preparation of composite nanofiber membrane (same as Example 1)

[0094] The base film ...

Embodiment 3

[0099] Compared with Example 1, the main difference is that the voltage of the spinning process is adjusted:

[0100] (1) Preparation of PAN solution

[0101] The PAN solution is prepared by uniformly mixing polyacrylonitrile with a molecular weight of 150,000 and solvent N,N-dimethylacetamide according to weight percentages of 12wt% and 88wt% at 60°C.

[0102] (2) Preparation of PVDF solution

[0103] The PVDF solution is prepared by mixing 12wt% and 88wt% of PVDF with a model of 6020 and a solvent N,N-dimethylacetamide at normal temperature.

[0104] (3) Preparation of base film

[0105] The film casting liquid obtained in steps (1) and (2) was respectively put into a 10mL syringe, the coaxial needle was connected with a Teflon catheter, the distance between the needle and the roller was adjusted to 15cm, and a 15kv high-voltage static electricity was connected to the needle , the flow rate of the casting liquid is 0.5mL / h, the winding speed of the drum is 300rn / min, and ...

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Abstract

The invention belongs to the technical field of heavy metal sewage treatment, and particularly relates to a heavy metal adsorption fiber membrane which is formed by staggering and weaving PVDF-coated PAN composite fibers. The PVDF-coated PAN composite fiber comprises a PVDF core fiber and a PAN shell layer coating the PVDF core fiber, and the outer surface of the PAN shell layer is a functional layer subjected to oximation and / or carboxylation modification treatment. In addition, the invention also provides a preparation method of the fiber membrane. The invention provides a PVDF-coated PAN (Polyvinylidene Fluoride) composite fiber with a brand new structure and a fiber membrane material obtained by interlacing and weaving the fiber. Research finds that the membrane material disclosed by the invention has excellent metal adsorption performance and also has excellent mechanical performance and cyclic adsorption stability.

Description

technical field [0001] The invention relates to the technical field of environmental treatment, in particular to a fiber membrane material for adsorbing metal ions. Background technique [0002] Fiber membrane material is an ideal adsorption material due to its high porosity and multi-connected pore structure. The use of fiber membranes to treat wastewater containing metal ions has received extensive attention from researchers at home and abroad. This is mainly because, compared with traditional adsorption materials, the active sites of membrane materials are located on the membrane surface or pore wall, which can greatly increase the contact between the material and metal ions, reduce the reaction time, shorten the reaction process, and control the volume of the reactor. Commonly used methods for fabricating fibrous membranes include stretching, template synthesis, phase separation, self-assembly, and electrospinning, and electrospinning is the only method that can continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D69/02B01D71/34B01D71/42B01D67/00B01D15/08C02F1/28C02F1/44C02F101/20
CPCB01J20/265B01J20/28033B01J20/3085B01D69/02B01D71/34B01D71/42B01D67/0093B01D15/08C02F1/288C02F1/44B01D2325/24B01D2325/12C02F2101/20Y02P10/20
Inventor 陈仰蒋兰英
Owner CENT SOUTH UNIV
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