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Production method of heavy metal ion adsorption type PVDF modified separation membrane

A heavy metal ion, adsorption-type technology, applied in the field of separation membranes, can solve the problems of few and difficult hyperbranched polymers

Inactive Publication Date: 2019-01-11
TIANJIN JINLIN WATER TREATMENT SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are not many reports on the hyperbranched modification of PVDF to improve the adsorption capacity of heavy metal ions. How to introduce hyperbranched polymers into membrane materials to achieve ideal results is still a major problem in this field.

Method used

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  • Production method of heavy metal ion adsorption type PVDF modified separation membrane
  • Production method of heavy metal ion adsorption type PVDF modified separation membrane
  • Production method of heavy metal ion adsorption type PVDF modified separation membrane

Examples

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Effect test

Embodiment 1

[0073] Example 1 Preparation of Heavy Metal Ion Adsorption Type PVDF Modified Separation Membrane PVDF-g-PAA-Gn PAMAM Membrane

[0074] (1) Pretreatment of PVDF powder. Weigh 25g of potassium hydroxide to prepare a 2.5mol / L potassium hydroxide solution, quickly add 20g of PVDF powder into the potassium hydroxide solution in a water bath at 60°C, and control the ratio of PVDF powder and potassium hydroxide solution to 20g:150 -300mL, at the same time quickly pour 4mL of absolute ethanol and stir for 10min, then filter with suction, wash with a large amount of deionized water for more than 3 times, and dry the final product for later use. Take 5g of the treated PVDF powder and place it in 100mL N-N dimethylformamide (DMF), and dissolve it with nitrogen gas at 60°C. After the PVDF powder is dissolved, continue to pass nitrogen gas for 5min, then add 10g of acrylic acid (AA) and 0.1g of bismuth After nitrogen bisisobutyronitrile (AIBN) was passed through nitrogen for 15 minutes, ...

Embodiment 2

[0083] Example 2: Preparation of Heavy Metal Ion Adsorption Type PVDF Modified Separation Membrane PVDF-g-PAA-Gn PAMAM Membrane (1) Pretreatment of PVDF powder. Weigh 30g of potassium hydroxide to prepare a 3mol / L sodium hydroxide solution, quickly add 30g of PVDF powder into the sodium hydroxide solution in a 70°C water bath, and at the same time quickly pour 6mL of absolute ethanol into it and stir for 20min before suction filtration. and washed with a large amount of deionized water for more than 5 times, and the finally obtained product was dried for later use. Take 11g of the treated PVDF powder and place it in 120mL N-N dimethylformamide (DMF), dissolve it with nitrogen gas at 70°C, and continue nitrogen gas flow for 15min after the PVDF powder is dissolved, then add 15g of acrylic acid (AA) and 0.3g of bismuth Nitrogen gas was passed through nitrogen bisisobutyronitrile (AIBN) for 25 minutes, continued to stir for 12 hours, then suction filtered, washed with deionized w...

Embodiment 3

[0091] Example 3 Preparation of Heavy Metal Ion Adsorption Type PVDF Modified Separation Membrane PVDF-g-PAA-Gn PAMAM Membrane

[0092](1) Pretreatment of PVDF powder. Weigh 28g of potassium hydroxide to prepare a 2.8mol / L potassium hydroxide solution, quickly add 25g of PVDF powder into the potassium hydroxide solution in a water bath at 65°C, and at the same time quickly pour 5mL of absolute ethanol and stir for 15min before pumping Filter, and wash with a large amount of deionized water more than 4 times, and finally the product obtained is dried for later use. Take 8g of the treated PVDF powder and put it in 110mL N-N dimethylformamide (DMF), and dissolve it under nitrogen gas at 65°C. After the PVDF powder is dissolved, continue to pass nitrogen gas for 10min, then add 12g of acrylic acid (AA) and 0.2g of bismuth Nitrogen was passed through nitrogen bisisobutyronitrile (AIBN) for 20 minutes, continued to stir for 12 hours, then suction filtered, washed with deionized wat...

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Abstract

The invention discloses a production method of a heavy metal ion adsorption type PVDF modified separation membrane, and belongs to the technical field of separation membranes. The PVDF modified separation membrane is characterized in that the PVDF modified separation membrane is prepared by modifying a PVDF flat membrane with polyamide-amine (PAMAM), and the PAMAM has an adsorption effect on heavymetal ions. The adsorption capacity of the PVDF modified separation membrane to heavy metal ions increases with the increase of the grafting generation of the PAMAM. The heavy metal ions adsorbed bythe PVDF modified separation membrane can be recovered by washing the PVDF modified separation membrane with a washing solution, and the separation membrane can be reused. The PVDF modified separationmembrane has a higher water flux than the pure PVDF membrane, and has stable physical properties. The production method has the advantages of no special device, simplicity in production, and easinessenforcement, and the produced PVDF modified separation membrane has a low cost.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a preparation method of a heavy metal ion adsorption type PVDF modified separation membrane. Background technique [0002] In recent years, with the development of modern industry, the pollution caused by the discharge of industrial wastewater containing heavy metal ions such as copper, cadmium, nickel, and zinc has become increasingly serious, which has caused serious environmental pollution problems. Environmental protection, the treatment of heavy metal wastewater is imminent. [0003] At present, the commonly used methods for dealing with heavy metal ions include chemical precipitation, membrane separation, ion exchange, complexation and adsorption. Among them, the membrane separation method has attracted extensive attention due to its advantages of convenient operation, high adsorption efficiency and recyclability, including ultrafiltration membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/26C02F1/28C02F101/20
CPCB01J20/264C02F1/28C02F1/285C02F2101/20
Inventor 孙丽张筱烨赵国部李焕焕张东东赵义平
Owner TIANJIN JINLIN WATER TREATMENT SCI & TECH CO LTD
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