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PVDF (Polyvinylidene Fluoride)-SiO2 composite membrane and preparation method thereof

A composite membrane, PVDF-sio2 technology, applied in the field of PVDF-SiO2 composite membrane and its preparation, can solve the problem of low adsorption capacity of heavy metal ions, and achieve the effect of fast speed and easy use

Inactive Publication Date: 2017-09-19
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to solve the problem of mesoporous SiO 2 The defects of agglomeration during use and low adsorption capacity of the membrane to heavy metal ions provide a new type of PVDF-SiO 2 Composite film and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of MAA modified PVDF polymer: Dissolve 6.0 g of PVDF in 100 ml of N,N-dimethylformamide (DMF) solvent, and then add 0.08 g of azobisisobutyronitrile (AIBN) in sequence, 1.0 g ethylene glycol dimethacrylate (EGDMA) and 2.0 g methacrylic acid (MAA), pass N 2 After 30 minutes, the system was sealed, and the reaction was stirred at 80°C for 6 hours. The resulting reaction mixture solution was centrifuged, washed with ethanol and distilled water for 3 times, and then centrifuged. The centrifuged precipitate was dried at 60°C for 12 hours to obtain MMA modified PVDF. polymer;

[0023] (2) Preparation of casting solution: add 2.7 g of MAA modified PVDF polymer and 0.9 g of porogen triblock copolymer F127 prepared in step (1) into a beaker containing 15 ml of DMF, and magnetically stir at 60°C 4h, after the solution is cooled to room temperature, it is placed in a vacuum drying oven at room temperature for vacuum degassing for 2 hours to prepare a casting solution...

Embodiment 2

[0026] (1) Same as Example 1;

[0027] (2) Preparation of casting solution: add 3.2 g of MAA modified PVDF polymer and 0.4 g of porogen triblock copolymer F127 prepared in step (1) into a beaker containing 15 ml of DMF, and magnetically stir at 60°C 4h, after the solution is cooled to room temperature, it is placed in a vacuum drying oven at room temperature for vacuum degassing for 2 hours to prepare a casting solution;

[0028] (3) Same as Example 1;

[0029] (4) Same as Example 1.

Embodiment 3

[0031] (1) Same as Example 1;

[0032] (2) Same as Example 1;

[0033] (3) Same as Example 1;

[0034] (4)PVDF-SiO 2 Preparation of composite membrane: 1.67 g of F127 and 2.1 g of cetyltrimethoxyammonium bromide (CTAB) were added to a three-necked flask containing 200ml of HCl solution (0.02M), stirred rapidly for 30 minutes, and then added Stir 1.4 g of mesitylene at room temperature for 2 hours, then add the MAA modified PVDF flat membrane prepared in step (3), stir for 2 hours, add 10.0 g of ethyl orthosilicate (TEOS) and 4.0 g of 3-mercaptopropane Trimethoxysilane (MPTMS), stirred at room temperature for 24h, then the three-necked flask was allowed to stand at 80℃ for 48h, and then the membrane in the flask was taken out with HCl (100ml, 0.02M) and absolute ethanol (100ml) The mixed solution was refluxed at 80°C for 72h, and then soaked in distilled water for 24h to obtain PVDF-SiO 2 Composite membrane.

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Abstract

The invention discloses a PVDF (Polyvinylidene Fluoride)-SiO2 composite membrane for synthesizing thiol-functionalized mesoporous silica microspheres in membrane pores and a preparation method thereof, and belongs to the field of preparation of membrane materials. The preparation method comprises the following steps: (1) modifying a PVDF polymer with MAA (Methacrylic Acid); (2) preparing the modified polymer obtained in the step (1) into a casting solution; (3) preparing the casting solution obtained in the step (2) into a membrane through a solution phase inversion method; (4) synthesizing thiol-functionalized mesoporous silica microspheres in the membrane pores and on the membrane surface of the membrane obtained in the step (3) to obtain the PVDF-SiO2 composite membrane. The uniformly-dispersed thiol-functionalized mesoporous silica microspheres are synthesized in the membrane pores and on the membrane surface of a large-pore base membrane in one step, and effective fixation of mesoporous silica in the membrane pores and on the membrane surface and penetration of the membrane pores and mesopores are realized, so that the obtained membrane has high stability and high heavy metal ion adsorption-desorption performance, and can be widely applied in the field of wastewater treatment.

Description

Technical field [0001] The invention relates to a PVDF-SiO 2 Composite membrane and its preparation method, specifically a kind of mesoporous SiO 2 PVDF-SiO obtained by fixing microspheres on the pores and surface of polyvinylidene fluoride (PVDF) membrane 2 A composite membrane and a preparation method thereof belong to the field of membrane material preparation science and technology. Background technique [0002] In the field of environment and health, heavy metals mainly refer to elements with significant biological toxicity such as mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr), and arsenic (As). They also refer to copper (Cu), zinc ( General heavy metals such as Zn), cobalt (Co) and nickel (Ni) exist in water bodies in various chemical forms and migrate and accumulate in the environment. The main sources of man-made pollution of water and heavy metals are mining, metal smelting, metal processing and chemical production wastewater, pesticides, fertilizers, and domestic...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/02B01D69/12B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D69/125B01D71/027B01D71/34B01D2325/12
Inventor 陈熙王泽亚徐亮亮袁千玄马胜奎董华琳李丽颖陈莉
Owner TIANJIN POLYTECHNIC UNIV
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