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Preparation method of complexant-grafting polyvinylidene fluoride adsorption film

A polyvinylidene fluoride and complexing agent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problem of heavy metal ion adsorption capacity, low adsorption efficiency, large heavy metal ion adsorption capacity, easy Desorption and other problems, to achieve the effect of improving anti-pollution ability, easy industrial production, and improving hydrophilicity

Active Publication Date: 2016-11-09
吉林市润成膜科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention discloses a preparation method of a complexing agent grafted polyvinylidene fluoride adsorption film to solve the problems of the current PVDF adsorption film on the adsorption capacity and low adsorption efficiency of heavy metal ions in water bodies. After PVDF is modified by hydrophilicity, the water flux , anti-pollution performance, etc. have been greatly improved. After modification, the complexing agent can be well grafted to PVDF without affecting the performance of PVDF. The modified PVDF is prepared into a tubular membrane with high strength and large adsorption capacity for heavy metal ions. , easy to desorb in acidic solution, can achieve water discharge under normal pressure, and at the same time remove impurities such as large particles and colloids in the water body

Method used

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specific Embodiment approach 1

[0031] Specific embodiment one: the preparation method of a complexing agent grafted polyvinylidene fluoride adsorption film in this embodiment is completed by the following steps:

[0032]Hydrophilic modification of PVDF: Dissolve 21g of PVDF in 120.45g of N,N-dimethylformamide solvent, heat in a constant temperature water bath at 65°C, stir mechanically for 5 hours, add 0.15g of potassium persulfate as an initiator, stir well, and then dropwise Add 8.4g vinyl butyrate, add dropwise for 10min, react for 0.5h, pour the mixed solution into deionized water to solidify, and soak for 12h to obtain a blended resin of PVDF and vinyl butyrate, under vacuum conditions at 105°C Dry for 4 hours, and the product is crushed to about 50 mesh by a pulverizer for later use.

[0033] Hydrolysis of PVDF blended resin: Pour the blended resin of PVDF and vinyl butyrate into a beaker, add calcium hydroxide solution with a pH value of 7.5, heat in a constant temperature water bath at 70°C, stir ma...

specific Embodiment approach 2

[0040] Specific embodiment two: the preparation method of a complexing agent grafted polyvinylidene fluoride adsorption film in this embodiment is completed by the following steps:

[0041] Hydrophilic modification of PVDF: Dissolve 21g of PVDF in 120.45g of N,N-dimethylformamide solvent, heat in a constant temperature water bath at 70°C, stir mechanically for 5.5h, add 0.15g of potassium persulfate as an initiator, stir well, and then Add 8.4g of vinyl butyrate dropwise for 13 minutes. After reacting for 0.7 hours, pour the mixed solution into deionized water to solidify and soak for 12 hours to obtain a blended resin of PVDF and vinyl butyrate. Dry for 4 hours under the same conditions, and the product is crushed to about 50 mesh by a pulverizer for later use.

[0042] Hydrolysis of PVDF blended resin: Pour the blended resin of PVDF and vinyl butyrate into a beaker, add calcium hydroxide solution with a pH value of 7.5, heat in a constant temperature water bath at 70°C, and ...

specific Embodiment approach 3

[0048] Specific embodiment three: a kind of preparation method of complexing agent grafted polyvinylidene fluoride adsorption film in this embodiment is completed by the following steps:

[0049] Hydrophilic modification of PVDF: Dissolve 21g of PVDF in 120.45g of N,N-dimethylformamide solvent, heat in a constant temperature water bath at 65°C, stir mechanically for 5 hours, add 0.15g of ammonium persulfate as an initiator, stir well, and then dropwise Add 8.4g of vinyl propionate, add dropwise for 10min, react for 0.5h, pour the mixed solution into deionized water to solidify, and soak for 12h to obtain a blended resin of PVDF and vinyl propionate. Dry for 4 hours, and the product is crushed to about 50 mesh by a pulverizer for later use.

[0050] Hydrolysis of PVDF blended resin: Pour the blended resin of PVDF and vinyl propionate into a beaker, add calcium hydroxide solution with a pH value of 7.5, heat in a constant temperature water bath at 70°C, and stir magnetically at ...

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Abstract

The invention discloses a preparation method of a complexant-grafting polyvinylidene fluoride adsorption film and belongs to the technical field of films for water treatment. According to the preparation method, polyvinylidene fluoride (PVDF) is used as a film material, and by polymerization of functional organic matter, the PVDF film with adsorptive property is prepared. The PVDF film is used for adsorption of heavy metal ions such as copper, mercury, cadmium, nickel ions, etc. in water. The functional organic matter in the PVDF adsorption film is an organic complexant with strong chelating property. The hydrophilically-modified PVDF is grafted with the complexant. According to the adsorption film, excellent properties of PVDF and the complexant are integrated. Without external pressure, effluent discharging is carried out. In comparison with existing adsorption film materials, the adsorption film has the following advantages: adsorption capacity and adsorption efficiency are greatly raised; preparation technology is simple; cost is low; and large-scale production is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of membranes for water treatment, and relates to a preparation method of an adsorption membrane grafted with a functional organic complexing agent to hydrophilic PVDF, which is used to remove heavy metal ions such as copper, mercury, nickel, and cadmium in water bodies. In the chemical industry, drinking water and other water treatment industries, the adsorption capacity is large, the efficiency is high, and it can be recycled many times. Background technique [0002] At present, the pollution of heavy gold water ions in water is serious, threatening human health, the survival of animals, plants and aquatic organisms. There are many types of heavy metal pollution, high toxicity, and not easy to degrade naturally. Pollution status. [0003] PVDF is a widely used material in the membrane industry for water treatment, but PVDF itself has a certain degree of hydrophobicity. After hydrophilic modification, it ca...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28C02F1/28C02F101/20
CPCB01J20/265B01J20/28033C02F1/285C02F1/288C02F2101/20
Inventor 崔学军王忠祥刘洪兵张瑛琪
Owner 吉林市润成膜科技有限公司