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Renewable PVDF membrane with adsorption function and preparation method thereof

A technology of function and preparation steps, applied in the field of renewable PVDF membrane with adsorption function and its preparation, can solve the problems of difficult control of grafting effect, high free radical activity, complicated technical process, etc., and achieve both adsorption effect and reproducibility Renewable, easy to recycle, simple effect of renewable process

Active Publication Date: 2021-11-05
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-energy rays will cause damage to the membrane surface, and the process is complicated and requires high equipment
[0023] In addition, an irradiation method has also been reported; however, the technical process of this method is complicated, the equipment requirements are high, and the activity of free radicals is high, so the grafting effect is difficult to control
At present, the PVDF membrane with adsorption function prepared in the technology only considers the adsorption capacity under static conditions

Method used

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  • Renewable PVDF membrane with adsorption function and preparation method thereof
  • Renewable PVDF membrane with adsorption function and preparation method thereof
  • Renewable PVDF membrane with adsorption function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A kind of preparation method of renewable PVDF membrane I with adsorption function, concrete preparation steps are as follows:

[0061] S1. Introduce hydroxyl groups in the process of preparing PVDF membranes to form active PVDF membranes:

[0062] S101. Preparation of casting solution: 20 parts by weight of polyvinylidene fluoride, 6 parts by weight of polyethylene glycol-600 and 74 parts by weight of dimethyl sulfoxide were mixed and stirred evenly, and heated and stirred in a water bath at 70° C. for 4 hours, and then Static defoaming for 4 hours, cooled to room temperature for use;

[0063] S102, preparing a coagulation bath: dissolving polyvinyl alcohol with a molecular weight of 24200 in distilled water at 70°C to prepare a 10wt.% polyvinyl alcohol solution;

[0064] S103. Film preparation: Pour the casting solution on a glass plate and scrape it into a liquid film with a thickness of 500 μm, put it in a coagulation bath with a constant temperature of 25°C, and s...

Embodiment 2

[0080] A method for preparing a renewable PVDF membrane II with adsorption function, the specific preparation steps are as follows:

[0081] S1. Introduce hydroxyl groups in the process of preparing PVDF membranes to form active PVDF membranes:

[0082] S101. Preparation of casting solution: 20 parts by weight of polyvinylidene fluoride, 6 parts by weight of polyethylene glycol-600 and 74 parts by weight of dimethyl sulfoxide were mixed and stirred evenly, and heated and stirred in a water bath at 70° C. for 4 hours, and then Static defoaming for 4 hours, cooled to room temperature for use;

[0083] S102, preparing a coagulation bath: dissolving polyvinyl alcohol with a molecular weight of 24200 in distilled water at 70°C to prepare a 5wt.% polyvinyl alcohol solution;

[0084] S103. Film preparation: Pour the casting solution on a glass plate and scrape it into a liquid film with a thickness of 500 μm, put it in a coagulation bath with a constant temperature of 25°C, and soli...

Embodiment 3

[0095] A method for preparing a renewable PVDF membrane III with adsorption function, the specific preparation steps are as follows:

[0096] S1. Introduce hydroxyl groups in the process of preparing PVDF membranes to form active PVDF membranes:

[0097] S101. Preparation of casting solution: 20 parts by weight of polyvinylidene fluoride, 6 parts by weight of polyethylene glycol-600 and 74 parts by weight of dimethyl sulfoxide were mixed and stirred evenly, and heated and stirred in a water bath at 70° C. for 4 hours, and then Static defoaming for 4 hours, cooled to room temperature for use;

[0098] S102, preparing a coagulation bath: dissolving polyvinyl alcohol with a molecular weight of 24200 in distilled water at 70°C to prepare a 5wt.% polyvinyl alcohol solution;

[0099] S103. Film preparation: Pour the casting solution on a glass plate and scrape it into a liquid film with a thickness of 500 μm, put it in a coagulation bath with a constant temperature of 25°C, and sol...

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Abstract

The invention discloses a renewable PVDF membrane with an adsorption function and a preparation method thereof, and the preparation method of the PVDF membrane comprises the following steps: S1, introducing an active group at least comprising hydroxyl in the PVDF membrane forming process by adopting a polymer / non-solvent co-induced phase separation method to prepare an active PVDF membrane; s2, grafting a supramolecular compound on the active PVDF membrane by adopting a chemical modification method; wherein the supramolecular compound is selected from one or more of alpha-cyclodextrin, beta-cyclodextrin, gamma-cyclodextrin and hydroxypropyl-beta-cyclodextrin; and S3, soaking the PVDF membrane grafted with the supramolecular compound in water for at least 72 hours to obtain the renewable PVDF membrane with the adsorption function, according to the preparation method of the reproducible PVDF membrane with the adsorption function, the PVDF membrane has the molecular recognition capability, meanwhile, it is guaranteed that adsorption sites are completely displayed, the adsorption effect is improved, the preparation process is easy to operate, the condition is mild, and the original structure of the PVDF membrane is not damaged; and meanwhile, the membrane also has renewable recycling performance, the renewable process is simple, and the membrane is easy to recycle.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a renewable PVDF membrane with adsorption function and a preparation method thereof. Background technique [0002] With the development of industry and economy, pollutants such as large particulate matter, small molecular organic matter, and heavy metals are discharged into the environment, resulting in complex components of wastewater and bringing challenges to wastewater purification. Current treatment methods, such as biological methods, advanced oxidation methods, adsorption methods, and membrane separation technologies, have single functions and are difficult to meet the increasingly complex water treatment requirements. Therefore, it is of great significance to endow the separation membrane with adsorption function to remove small molecular organic pollutants in water. The advantages of separation membrane screening for large particle pollutants and the adsorption of smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00C02F1/44C02F1/28C02F101/30
CPCB01D71/34B01D67/0006C02F1/44C02F1/285C02F2101/30
Inventor 李娜娜鲁清晨张小明史雪勤苗苗郭丹徐建国陆永吉
Owner TIANJIN POLYTECHNIC UNIV
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