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Polyvinylidene fluoride and metal-organic framework composite ultra-filtration membrane and preparation and application

A technology of metal organic framework and polyvinylidene fluoride, which is applied in ultrafiltration, membrane, membrane technology, etc., to achieve the effects of improving anti-pollution ability, convenient operation and low production cost

Active Publication Date: 2016-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment capacity and anti-pollution ability of the obtained ultrafiltration membrane for wastewater need to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of metal-organic framework MIL-100(Fe): Weigh 277.5 mg of iron powder (purity>99%, 300 mesh), 687.5 mg of 1,3,5-benzenetricarboxylic acid (melting point>300°C, purity >98% white powder) into the polytetrafluoroethylene liner, add 20mL high-purity water, then add dropwise 200μL hydrofluoric acid (35wt%) and 190μL nitric acid (65wt%) to mix well, cover and move to the inner liner After the PTFE stainless steel reaction kettle was sealed, it was placed in an electric blast constant temperature drying oven at 150°C for 12 hours. The product was washed with ethanol and high-purity water, and dried by high-speed centrifugation. The finally obtained orange-yellow solid was vacuum-dried at 100° C. for 12 h to obtain a metal-organic framework MIL-100(Fe).

[0034] (2) Configure the casting solution: add 2wt% of MIL-100(Fe) to 77wt% of N-methylpyrrolidone, ultrasonically disperse at an ultrasonic frequency of 50kHz for 30min, and then add 20wt% of the dried polyv...

Embodiment 2

[0038] (1) Preparation of metal-organic framework MIL-100(Fe): Weigh 277.5 mg of iron powder (purity>99%, 300 mesh), 687.5 mg of 1,3,5-benzenetricarboxylic acid (melting point>300°C, purity >98% white powder) into the polytetrafluoroethylene liner, add 20mL high-purity water, then add 200μL hydrofluoric acid (35wt%) and 190μL nitric acid (65wt%) dropwise, mix well, cover and move to a stainless steel reaction kettle After inner sealing, place in an electric blast constant temperature drying oven to react at 150°C for 12h. The product was washed with ethanol and high-purity water, and dried by high-speed centrifugation. The finally obtained orange-yellow solid was vacuum-dried at 100° C. for 12 h to obtain a metal-organic framework MIL-100(Fe).

[0039] (2) Configure the casting solution: add 0.25wt% of MIL-100 (Fe) to 83.5wt% of N-methylpyrrolidone, ultrasonically disperse at an ultrasonic frequency of 50kHz for 30min, and then add 16wt% of the dried poly Vinylidene fluoride...

Embodiment 3

[0043] (1) Preparation of metal-organic framework MIL-100(Fe): Weigh 277.5 mg of iron powder (purity>99%, 300 mesh), 687.5 mg of 1,3,5-benzenetricarboxylic acid (melting point>300°C, purity >98% white powder) into the polytetrafluoroethylene liner, add 20mL high-purity water, then add 200μL hydrofluoric acid (35wt%) and 190μL nitric acid (65wt%) dropwise, mix well, cover and move to a stainless steel reaction kettle After inner sealing, place in an electric blast constant temperature drying oven to react at 150°C for 12h. The product was washed with ethanol and high-purity water, and dried by high-speed centrifugation. The finally obtained orange-yellow solid was vacuum-dried at 100° C. for 12 h to obtain a metal-organic framework MIL-100(Fe).

[0044] (2) Configure the casting solution: add 1wt% of MIL-100(Fe) to 80.5wt% of N-methylpyrrolidone, ultrasonically disperse at an ultrasonic frequency of 50kHz for 30min, and then add 18wt% of the dried poly Vinyl fluoride and 0.5 wt...

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Abstract

The invention belongs to the technical field of composites, and discloses a polyvinylidene fluoride and metal-organic framework composite ultra-filtration membrane and preparation and application. The preparation method comprises the steps that MIL-100 (Fe) prepared through a hydrothermal method is ultrasonically dispersed in solvent, polyvinylidene fluoride and a pore-forming agent are sequentially added, stirring is conducted for 12-24 h to enable the added substances to be dissolved and blended to be uniform, and a membrane casting solution is formed; the membrane casting solution is defoamed and put on a support for membrane coating, staying of a coated membrane in the air is conducted for 30-60 s, the membrane is immersed into a coagulating bath for solvent exchange, and the polyvinylidene fluoride and metal-organic framework composite ultra-filtration membrane is obtained. The metal-organic framework material MIL-100 (Fe) is added to the composite ultra-filtration membrane, the hydrophily of the ultra-filtration membrane is improved, the separating capacity of the membrane is improved, the anti-pollution capacity of the ultra-filtration membrane is improved, the service life of the membrane is prolonged, and a good application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a polyvinylidene fluoride-metal organic framework composite ultrafiltration membrane and its preparation and application. Background technique [0002] Membrane technology has the characteristics of good treatment effect, excellent effluent quality, easy operation, and small impact on the environment. It overcomes the shortcomings of traditional water treatment processes and becomes the preferred technology in the field of water treatment in the 21st century. However, due to problems such as membrane fouling and membrane life, the further application of membrane technology in the field of water treatment is greatly limited. [0003] As a widely used synthetic material for ultrafiltration membranes, polyvinylidene fluoride is an excellent high-molecular organic polymer with good heat resistance, radiation resistance, chemical stability and easy film formati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/12B01D61/14C02F1/44
CPCB01D61/145B01D67/0002B01D69/12B01D71/34B01D2325/26B01D2325/36C02F1/444
Inventor 牛晓君杨佳
Owner SOUTH CHINA UNIV OF TECH
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