A kind of zif-8/polyvinylidene fluoride composite nanofiber membrane and its preparation method and application

A composite nanofiber and polyvinylidene fluoride technology, which is applied in fiber treatment, fiber type, textiles and papermaking, etc., can solve the problems of harsh process conditions, low loading rate, zeolite imidazolate skeleton, particle agglomeration, etc., and achieve simple process Practical, huge industrial application value, good regeneration performance

Active Publication Date: 2020-10-09
华工同创(东莞)环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the preparation of the above-mentioned nanofiber composite membrane, there are problems such as harsh process conditions, low loading rate and serious agglomeration of zeolite imidazolate skeleton ZIF-8 particles.

Method used

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  • A kind of zif-8/polyvinylidene fluoride composite nanofiber membrane and its preparation method and application
  • A kind of zif-8/polyvinylidene fluoride composite nanofiber membrane and its preparation method and application
  • A kind of zif-8/polyvinylidene fluoride composite nanofiber membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Measure 3.5mL dimethylacetamide and 5.9mL acetone, mix and stir for 0.5h, then add 0.54g of 2-methylimidazole, stir for 1h until dissolved; then add 0.8g of polyvinylidene fluoride, 50℃ Under heating and stirring for 10h, a spinning solution was obtained;

[0034] (2) The spinning solution prepared by step (1) is filled in a syringe with a No. 18 flat needle for spinning, the injection speed is 0.03mm / min, the voltage is 12.5kV, the receiving distance is 15cm, and the relative humidity is 20%. , the relative temperature is 24°C, and the receiving device is a roller collector to obtain a polyvinylidene fluoride electrospun film;

[0035] (3) Weigh 4.1g of zinc nitrate hexahydrate and dissolve it in 40mL of methanol solution, put 2g of the polyvinylidene fluoride electrospun membrane prepared by step (2), heat at 40°C for 5h, and wash three times with methanol to obtain Composite seed film of -8;

[0036] (4) Weigh 0.3g of zinc nitrate hexahydrate and 0.08g of 2-met...

Embodiment 2

[0039] (1) Measure 4.5mL dimethylacetamide and 6.2mL acetone, mix and stir for 1h, then add 0.725g of 2-methylimidazole, stir for 2h until dissolved; then add 1.45g of polyvinylidene fluoride, heat at 60°C Stir for 8h to obtain a spinning solution;

[0040] (2) The spinning solution prepared by step (1) is filled in a syringe with a No. 18 flat needle for spinning, the injection speed is 0.05mm / min, the voltage is 14.5kV, the receiving distance is 20cm, and the relative humidity is 22%. , the relative temperature is 25°C, and the receiving device is a drum collector to obtain a polyvinylidene fluoride electrospun film;

[0041] (3) Weigh 3.9g of zinc nitrate hexahydrate and dissolve it in 40mL of methanol solution, put 2g of the electrospun membrane prepared in step (2), heat at 50°C for 3h, and then wash three times with methanol to obtain a composite crystal with ZIF-8 Seed film;

[0042](4) Weigh 1.2g of zinc nitrate hexahydrate and 0.16g of 2-methylimidazole, dissolve th...

Embodiment 3

[0045] (1) Measure 4.1mL dimethylacetamide and 5.2mL acetone, mix and stir for 2h, then add 0.6g of 2-methylimidazole, stir for 3h until dissolved; then add 2.0g of polyvinylidene fluoride, heat at 70°C Stir for 5h to obtain a spinning solution;

[0046] (2) the spinning solution prepared by step (1) is filled in the syringe of No. 18 flat needles for spinning, the injection speed is 0.065mm / min, the voltage is 18kV, the receiving distance is 15cm, and the relative humidity is 29%. The relative temperature is 27°C, and the receiving device is a roller collector to obtain a polyvinylidene fluoride electrospun film;

[0047] (3) Weigh 2.5g of zinc nitrate hexahydrate and dissolve it in 40mL of methanol solution, put 2g of polyvinylidene fluoride electrospun membrane prepared by step (2), heat at 60°C for 2h, and then wash three times with methanol to obtain Composite seed film of -8;

[0048] (4) Weigh 1.6g of zinc nitrate hexahydrate and 0.12g of 2-methylimidazole, dissolve t...

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Abstract

The invention belongs to the technical field of preparation of functional composite nanofiber membranes and discloses a ZIF-8 / polyvinylidene fluoride composite nanofiber membrane and its preparation method and application. The preparation method of the invention includes the following steps: (1) Mix 2-methylimidazole and polyvinylidene fluoride to obtain a spinning liquid and prepare an electrospinning membrane; (2) Put the electrospinning membrane into methanol of zinc nitrate hexahydrate In the solution, prepare a composite seed crystal membrane with ZIF-8; (3) Then put the composite seed crystal membrane with ZIF-8 into a methanol solution mixed with zinc nitrate hexahydrate and 2-methylimidazole, wash and vacuum After drying, a ZIF‑8 / polyvinylidene fluoride composite nanofiber membrane was obtained. The invention overcomes the problems of low loading rate of ZIF-8 on the fiber membrane surface and serious crystal agglomeration. The adsorption and removal rate of Congo red dye wastewater can reach 92%. The membrane has good regeneration and is convenient for recycling.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional nanofiber membranes, in particular to a ZIF-8 / polyvinylidene fluoride composite nanofiber membrane and its preparation method and application. Background technique [0002] Textile printing and dyeing wastewater mainly comes from various production and processing procedures. Due to the different chemical raw materials used, the pollutants produced are also different. Congo red is a typical benzidine direct azo dye, which has a high loss rate during production and use, easily enters water bodies, and has a destructive effect on the ecological environment. Congo red dye wastewater has the characteristics of large changes in water quality, high chroma and high COD, and is difficult to treat by traditional aerobic biochemical treatment methods. Under anaerobic conditions, Congo red will produce more toxic aromatic amines. Therefore, it is of great practical significance to develop ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/4382D04H1/4318D04H1/728D06M15/19D06M101/22
CPCD04H1/4318D04H1/4382D04H1/728D06M15/19D06M2101/22
Inventor 程建华杨草张继勇周心慧
Owner 华工同创(东莞)环保技术有限公司
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