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Polyvinylidene fluoride mixed matrix membrane with photocatalytic self-cleaning performance as well as preparation method and application of polyvinylidene fluoride mixed matrix membrane

A technology of polyvinylidene fluoride and mixed matrix membrane, which is applied in the field of membrane separation, can solve the problems of polyvinylidene fluoride membrane membrane fouling, etc., and achieve the effect of improved hydrophilicity, increased rejection rate, and high rejection rate

Pending Publication Date: 2020-12-25
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a polyvinylidene fluoride mixed matrix film with photocatalytic self-cleaning performance and its preparation method and application, which are used to solve the film pollution problem of polyvinylidene fluoride film

Method used

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  • Polyvinylidene fluoride mixed matrix membrane with photocatalytic self-cleaning performance as well as preparation method and application of polyvinylidene fluoride mixed matrix membrane
  • Polyvinylidene fluoride mixed matrix membrane with photocatalytic self-cleaning performance as well as preparation method and application of polyvinylidene fluoride mixed matrix membrane
  • Polyvinylidene fluoride mixed matrix membrane with photocatalytic self-cleaning performance as well as preparation method and application of polyvinylidene fluoride mixed matrix membrane

Examples

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Effect test

preparation example Construction

[0042] A preparation method of a polyvinylidene fluoride (PVDF) mixed matrix membrane with photocatalytic self-cleaning performance, comprising the following steps:

[0043] 1) SnO 2 -Cu 2 Preparation of O nanocomposites: cuprous chloride (CuCl 2 ), stannous chloride dihydrate (SnCl 2 2H 2 O) and hydrochloric acid were added to deionized water, and ultrasonic 15-45min to obtain a mixed solution, then the pH of the mixed solution was adjusted to 7-12, the reducing agent hydrazine hydrate was added and reacted at room temperature for 1-4h, and the obtained product was centrifuged Finally, take the precipitate and wash it with ethanol, then vacuum-dry it at 40-80°C, and finally calcinate it at 100-400°C for 1-4h in an argon atmosphere to obtain SnO 2 -Cu 2 O nanocomposites;

[0044] Among them, CuCl 2 with SnCl 2 2H 2 The molar ratio of O is (1-4):(0.1-2); the addition amount of hydrochloric acid is 10-30mL / mol Cu, and the concentration of hydrochloric acid is 30-40mol / L...

Embodiment 1

[0050] This example is used to prepare SnO 2 -Cu 2 O nanocomposite material, concrete preparation method is as follows:

[0051] 1) Add 0.01mol CuCl 2 , 0.005mol SnCl 2 2H 2 0 and 0.2mL of 35mol / L hydrochloric acid were added to 200mL of deionized water, and ultrasonically treated for 30min to obtain a mixed solution;

[0052] 2) Add ammonia water to the mixed solution until the solution pH=9.0, then add 0.2mL hydrazine hydrate, and carry out the reduction reaction at room temperature for 2h;

[0053] 3) After the product was washed with ethanol, it was dried in vacuum at 60°C, and then the dry powder was calcined at 200°C for 2h under the protection of argon to obtain SnO 2 -Cu 2 O nanocomposites.

[0054] For the resulting SnO 2 -Cu 2 O nanocomposites were characterized by scanning electron microscopy, and the results were as follows figure 1 shown.

Embodiment 2

[0056] This example is used to prepare SnO 2 -Cu 2 O nanocomposite material, concrete preparation method is as follows:

[0057] 1) 0.04mol CuCl 2 , 0.004mol SnCl 2 2H 2 0 and 0.4 mL of 30 mol / L hydrochloric acid were added to 200 mL of deionized water, and ultrasonically treated for 15 min to obtain a mixed solution;

[0058] 2) Add ammonia water to the mixed solution until the solution pH=9.0, then add 0.4mL hydrazine hydrate, and carry out the reduction reaction at room temperature for 1 hour;

[0059] 3) The obtained product was washed with ethanol, dried in vacuum at 40°C, and then the dry powder was calcined at 100°C for 1 h under the protection of argon to obtain SnO 2 -Cu 2 O nanocomposites.

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Abstract

The invention relates to a polyvinylidene fluoride mixed matrix membrane with photocatalytic self-cleaning performance as well as a preparation method and application of the polyvinylidene fluoride mixed matrix membrane. The preparation method comprises the steps of mixing a SnO2-Cu2O nano composite material with polyvinylidene fluoride to prepare a membrane casting solution, and then preparing the polyvinylidene fluoride mixed matrix membrane by a non-solvent induced phase separation method. The mixed matrix membrane can be used for improving the organic pollutant resistance of a catalytic membrane reactor device. Compared with the prior art, SnO2-Cu2O is added into the polyvinylidene fluoride membrane casting solution in the form of an additive, and the PVDF membrane is modified by introducing an inorganic nanoparticle blending method and an NIPS method, so that the mechanical strength of the composite membrane is improved, the hydrophilicity is greatly enhanced, and the composite membrane has better anti-pollution capability and interception performance.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a polyvinylidene fluoride mixed matrix membrane with photocatalytic self-cleaning performance, a preparation method and application thereof. Background technique [0002] Membrane separation technology is one of the preferred technologies in the field of water pollution control engineering. Due to its low cost, good effluent quality, high degree of intensification, simple equipment, and convenient operation, it is widely used in drinking water purification, sewage treatment and reuse. . However, membrane fouling, especially organic fouling, often leads to attenuation of membrane flux, increase of operating cost and shortening of membrane service life, thus becoming the main obstacle to the widespread application of membrane separation technology in drinking water and sewage and wastewater treatment. [0003] Polyvinylidene fluoride (PVDF) is a homopolymer of vinylidene...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D65/02
CPCB01D71/024B01D71/34B01D69/02B01D67/0079B01D65/02B01D2321/34B01D2325/10B01D2325/36
Inventor 陈桂娥陈镇谢焕银李怡静万佳俊刘连静汪洋许振良
Owner SHANGHAI INST OF TECH
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