ZIF-8/polyvinylidene fluoride composite nanofiber membrane and preparation method and application thereof

A composite nanofiber and polyvinylidene fluoride technology, which is applied in fiber types, fiber treatment, 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, overcome the serious phenomenon of crystal agglomeration, and have good membrane regeneration performance

Active Publication Date: 2018-11-27
华工同创(东莞)环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • ZIF-8/polyvinylidene fluoride composite nanofiber membrane and preparation method and application thereof
  • ZIF-8/polyvinylidene fluoride composite nanofiber membrane and preparation method and application thereof
  • ZIF-8/polyvinylidene fluoride composite nanofiber membrane and preparation method and application thereof

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 drum 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 the...

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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 a preparation method and an application thereof. The preparation method comprises the following steps: (1) mixing 2-methylimidazole and polyvinylidene fluoride to obtain a spinning solution and prepare an electrospinning membrane; (2) placing the electrospinning membrane into methanol of zinc nitrate hexahydrate to prepare a composite seed crystal membrane with ZIF-8; (3) placing the composite seed crystal membrane with the ZIF-8 in the methanol solution mixing the zinc nitrate hexahydrate and the 2-methylimidazole and conducting washing and vacuum drying to obtain the ZIF-8 / polyvinylidene fluoride compositenanofiber membrane. By means of the method, the problem that the ZIF-8 has low loading rate on the surface of the fiber membrane and the crystal agglomeration is serious is solved, the adsorption removal rate of the Congo red dye wastewater can reach 92%, the membrane regeneration property is good, and the recycling is convenient.

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 Applications(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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