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

A composite membrane and membrane pore technology, applied in chemical instruments and methods, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve the problem of easy aggregation of mesoporous silica and adsorption of lead ions by adsorption membrane Low capacity, inconvenient use and other problems, to achieve the effect of simple equipment, easy industrial implementation, and fast speed

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 present invention is to solve the problems that the adsorption film has low ability to adsorb lead ions, mesoporous silica is easy to agglomerate, and is inconvenient to use, and provides a PVDF / SiO 2 Composite membrane and its preparation method, specifically by first preparing mercapto-functionalized mesoporous silica microspheres, and then blending them with PVDF to obtain PVDF / SiO with high adsorption capacity of lead ions 2 Composite film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of mesoporous silica:

[0025] Dissolve 2.28g of triblock copolymer (F127) and 0.28g of cetyltrimethoxyammonium bromide (CTAB) in 345ml of aqueous hydrochloric acid solution with a concentration of 0.4mol / L, stir mechanically at 45°C for 2h, then slowly Add 7.81g Tetraethyl Silicate (TEOS) and 2.24g γ-Mercaptopropyltriethoxysilane (TMMPS), mechanically stir at 45°C for 12h, then let the reaction solution stand at 95°C for 5d, centrifuge and dry to obtain a powder sample, and then disperse the obtained powder sample into 100ml of hydrochloric acid-ethanol mixture, reflux at 70°C for 48h, and then centrifuge, and the separated product is washed with NaHCO 3 (1mol / L) washing until the eluate is neutral, and then vacuum-dried to obtain powdery mesoporous SiO 2 ;

[0026] (2) Preparation of casting solution: 0.31g of mercapto-functionalized SiO obtained in step (1) 2 , 2.81g PVDF powder was added to 14.22g DMF one by one, mechanically stirred at 60°C for 6...

Embodiment 2

[0029] (1) with embodiment 1;

[0030] (2) Preparation of casting solution: 0.62 g of mercapto-functionalized mesoporous SiO obtained in step (1) 2 2.50g of PVDF powder was added to 14.22g of DMF one by one, mechanically stirred at 60°C for 6 hours to obtain a homogeneous solution, and then left to defoam under vacuum for 2 hours to obtain a casting solution;

[0031] (3) with embodiment 1.

Embodiment 3

[0033] (1) with embodiment 1;

[0034](2) Preparation of casting solution: 0.94 g of mercapto-functionalized mesoporous SiO obtained in step (1) 2 , 2.19g PVDF powder was added to 14.22g DMF one by one, mechanically stirred at 60°C for 6 hours to obtain a homogeneous solution, and then left to defoam under vacuum for 2 hours to obtain a casting solution;

[0035] (3) with embodiment 1.

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Abstract

The invention discloses a PVDF (Polyvinylidene Fluoride) / SiO2 composite membrane and a preparation method thereof, and belongs to the field of preparation of membrane materials. The preparation method comprises the following steps: (1) preparing thiol-functionalized mesoporous SiO2 microspheres; (2) preparing the thiol-functionalized mesoporous SiO2 microspheres obtained in the step (1) and PVDF into a casting solution; (3) preparing the casting solution obtained in the step (2) into a PVDF / SiO2 composite membrane through a solution precipitation phase inversion method. By adopting the preparation method, agglomeration of mesoporous silica nanoparticles is avoided, and effective fixation of mesoporous silica in membrane pores and penetration of the membrane pores and mesopores are realized, so that the obtained membrane has high stability and high heavy metal lead ion adsorption-desorption performance, and can be widely applied in the field of lead ion wastewater treatment.

Description

technical field [0001] The invention relates to a PVDF / SiO 2 Composite membrane and preparation method thereof, specifically a kind of mesoporous SiO 2 PVDF / SiO obtained by blending microspheres and polyvinylidene fluoride (PVDF) into a film 2 The composite membrane and its preparation method belong to the field of membrane material preparation science and technology. Background technique [0002] Lead is a widely distributed and accumulative heavy metal environmental pollutant. Lead mainly exists in metallurgy, printing, electroplating, machinery manufacturing, chemical pharmaceuticals, petroleum processing, paint, textile and other industrial production wastewater. Lead and soluble lead salts are poisonous and can cause serious harm to the human body, animals and plants: lead can poison the human nerve and hematopoietic system, causing convulsions, nerve slowness and anemia, etc., especially affecting the development of children; the harm of lead to plants is mainly Ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/34B01J20/10B01D69/06C02F1/44C02F1/28C02F101/20
CPCB01D67/0079B01D69/06B01D69/12B01D69/122B01D71/34B01D2313/40B01D2325/02B01J20/103C02F1/28C02F1/44C02F2101/20
Inventor 李丽颖王文强袁千玄韩鹏陈熙陈莉
Owner TIANJIN POLYTECHNIC UNIV
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