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Preparation method of modified PVDF for heavy metal ion adsorption type separation films

A heavy metal ion and adsorption-type technology, which is applied in the direction of semi-permeable membrane separation, alkali metal compounds, chemical instruments and methods, etc., can solve problems affecting the stability of membrane performance, etc., achieve improved separation efficiency, easy industrial implementation, and increased cost little effect

Inactive Publication Date: 2017-04-26
TIANJIN CNCLEAR ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is a problem of compatibility between the two phases in the blending film production, which affects the performance stability of the film

Method used

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  • Preparation method of modified PVDF for heavy metal ion adsorption type separation films

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029](1) Pretreatment of PVDF powder. Accurately weigh a certain mass of KOH, and use absolute ethanol to prepare 200mL of a solution with a concentration of 1.0mol / L, put it in a beaker, add 40g of PVDF powder, stir magnetically at 50°C for 15 minutes, suction filter, and use deionized Wash with water until the pH of the cleaning solution is about 7. After suction filtration, dry the pretreated PVDF powder for later use.

[0030] (2) Preparation of PAMAM. ①Dissolve 4g of EDA in 20mL of methanol, then transfer it to a 100mL three-necked flask, and place 30g of MA in a constant-pressure dropping funnel under the condition of maintaining an ice-water bath at 0°C and nitrogen protection to make it pour into the three-necked flask. Gradually added dropwise to the flask for 20 minutes. After 2 hours, it was raised to room temperature 20°C, and continued to stir for 45 hours, then transferred to a single-necked flask and used a rotary evaporator for rotary evaporation, and the t...

Embodiment 2

[0036] (1) Pretreatment of PVDF powder. Accurately weigh a certain mass of KOH, and prepare 200mL of a solution with a concentration of 1.0mol / L with absolute ethanol, put it in a beaker, add 42g of PVDF powder, stir magnetically at 50°C for 30 minutes, filter it with suction, and use deionized Wash with water until the pH of the cleaning solution is about 7. After suction filtration, dry the pretreated PVDF powder for later use.

[0037] (2) Preparation of PAMAM. ① Dissolve 6g of EDA in 20mL of methanol, then transfer it to a 100mL three-necked flask, and place 40g of MA in a constant-pressure dropping funnel under the condition of maintaining an ice-water bath at 0°C and nitrogen protection Gradually added dropwise to the flask for 20 minutes. After 2 hours, it was raised to room temperature 20°C, and continued to stir for 45 hours, then transferred to a single-necked flask and used a rotary evaporator for rotary evaporation, and the temperature was gradually increased fr...

Embodiment 3

[0043] (1) Pretreatment of PVDF powder. Accurately weigh a certain mass of KOH, and prepare 200mL of a solution with a concentration of 1.5mol / L with absolute ethanol, put it in a beaker, add 43g of PVDF powder, stir magnetically at 55°C for 30 minutes, filter it with suction, and use deionized Wash with water until the pH of the cleaning solution is about 7. After suction filtration, dry the pretreated PVDF powder for later use.

[0044] (2) Preparation of PAMAM. ①Dissolve 5g of EDA in 20mL of methanol, then transfer it to a 100mL three-necked flask, and place 40g of MA in a constant-pressure dropping funnel under the condition of maintaining an ice-water bath at 5°C and nitrogen protection The flask was gradually added dropwise for 30 minutes. After 2 hours, it was raised to room temperature 30°C, and continued to stir for 50 hours, then transferred to a single-necked flask and used a rotary evaporator for rotary evaporation, and the temperature was gradually increased fr...

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Abstract

The invention discloses a preparation method of modified PVDF for heavy metal ion adsorption type separation films, belongs to the field of functional high polymer materials and particularly relates to a preparation technique used for preparation of the raw material PVDF for the heavy metal ion adsorption type separation films. The preparation method of the modified PVDF for the heavy metal ion adsorption type separation films has the characteristics that the modified PVDF is prepared by the means of the method that PVDF power is subjected to modifying through polyamide-amine (PAMAM) and can be applicable to preparing the flat sheet separation films or the hollow fiber separation films which have an adsorption effect on heavy metal ions. The heavy metal ion adsorption capacity of the separation films prepared from the modified PVDF is increased with augment of PAMAM hyperbranched modified algebra, the adsorbed heavy metal ions can be efficiently recycled through cleaning after the heavy metal ions are adsorbed by the separation films, and the separation films can be repeatedly used. The pure water influx of the separation films prepared from the modified PVDF is improved compared with pure PVDF films, and the physical property of the separation films is stable. Special equipment is not required for production of the modified PVDF for the heavy metal ion adsorption type separation films, industrial implementation is easy, and the cost of the prepared modified PVDF is small in increased amplitude.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and particularly relates to a preparation method of raw material modified polyvinylidene fluoride for heavy metal ion adsorption type separation membrane. A separation membrane with high-efficiency adsorption of ions. Background technique [0002] In recent years, the pollution of wastewater containing heavy metal ions such as lead, copper, cadmium, chromium, and mercury in the chemical and metallurgical industries is becoming increasingly serious. Heavy metal ion pollution has become a serious social and environmental problem, and it is an urgent need to solve economic development and environmental issues. Key issues in terms of health and drinking water safety. [0003] At present, the main methods for the harmless treatment of wastewater containing heavy metal ions include membrane separation, electrochemical precipitation, ion exchange, adsorption and biological treatment. Among ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D69/06B01D69/08B01D67/00B01J20/26B01J20/30B01J20/28C02F1/44C02F1/28C02F1/62C02F101/20
CPCB01D67/0002B01D69/06B01D69/08B01D71/78B01J20/264B01J20/28033C02F1/28C02F1/44C02F2101/20
Inventor 赵义平李山山张筱烨韩永良
Owner TIANJIN CNCLEAR ENVIRONMENTAL PROTECTION SCI & TECH CO LTD
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