Composite separation membrane with conductivity and preparation method thereof

A separation membrane and conductivity technology, which is applied in the field of polymer separation membrane surface modification, to achieve the effect of simple process, easy large-scale industrial application, and low equipment requirements

Active Publication Date: 2021-07-27
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the development of this membrane is a breakthrough in the field of membrane separation and retention of dyes, there is still room for improvement.

Method used

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  • Composite separation membrane with conductivity and preparation method thereof
  • Composite separation membrane with conductivity and preparation method thereof
  • Composite separation membrane with conductivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to figure 1 As shown, add 240mL ethylene glycol to a clean beaker, then add 8.5g NaOH, 0.3g AgNO 3 Add in ethylene glycol, stir to make it fully dissolve and evenly, to obtain a mixed solution; put a clean polyvinylidene fluoride (PVDF) diaphragm (5 × 5cm 2 ) into the mixed solution in the beaker, and left to stand for 60s, it can be observed that the PVDF film gradually changes from white to brownish yellow, which indicates that the preparation of the PVDF-Ag film is complete, and the coating of silver is conducive to the next step of the reaction. Subsequently, the PVDF-Ag membrane was washed with deionized water and dried naturally. Next, by successively adding 14g NiSO 4 ·6H 2 O, 14g CoSO 4 ·7H 2 O, 42gC 4 h 4 KNaO 6 4H 2 O, 5.8 g Na 3 C 6 h 5 o 7 and 1g C 2 h 10 BN was dissolved in 900 mL deionized water, and ammonia water was used as a buffer to adjust the pH to 10 to prepare a cobalt-nickel reducing solution. Immerse the PVDF-Ag membrane in ...

Embodiment 2

[0041] Add 240mL ethylene glycol to a clean beaker, then add 7.5g NaOH, 0.28g AgNO 3 Add in ethylene glycol, stir to make it fully dissolve and evenly, to obtain a mixed solution; put a clean polyvinylidene fluoride (PVDF) diaphragm (5 × 5cm 2 ) into the mixed solution of the beaker, and left to stand for 90s, it can be observed that the PVDF film gradually changes from white to brownish yellow, which indicates that the preparation of the PVDF-Ag film is complete, and the coating of silver is conducive to the next step of the reaction. Subsequently, the PVDF-Ag membrane was washed with deionized water and dried naturally. Next, by successively adding 10g NiSO 4 ·6H 2 O, 10g CoSO 4 ·7H 2 O, 45g C 4 h 4 KNaO 6 4H 2 O, 10g Na 3 C 6 h 5 o 7 and 1.5g C 2 h 10 BN was dissolved in 900 mL deionized water, and ammonia water was used as a buffer to adjust the pH to 10 to prepare a cobalt-nickel reducing solution. Immerse the PVDF-Ag membrane in the cobalt-nickel reducing ...

Embodiment 3

[0044] Add 240mL ethylene glycol to a clean beaker, then add 9.5g NaOH, 0.35g AgNO 3 Add in ethylene glycol, stir to make it fully dissolve and evenly, to obtain a mixed solution; put a clean polyvinylidene fluoride (PVDF) diaphragm (5 × 5cm 2 ) into the mixed solution in the beaker, and let it stand for 120s. It can be observed that the PVDF film gradually changes from white to brownish yellow, which indicates that the preparation of the PVDF-Ag film is completed, and the coating of silver is conducive to the next step of the reaction. Subsequently, the PVDF-Ag membrane was washed with deionized water and dried naturally. Next, by sequentially adding 18g NiSO 4 ·6H 2 O, 18g CoSO 4 ·7H 2 O, 50g C 4 h 4 KNaO 6 4H 2 O, 5g Na 3 C 6 h 5 o 7 and 2g C 2 h 10 BN was dissolved in 900 mL deionized water, and ammonia water was used as a buffer to adjust the pH to 10 to prepare a cobalt-nickel reducing solution. Immerse the PVDF-Ag membrane in the cobalt-nickel reducing so...

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Abstract

The invention relates to a conductive composite separation membrane and a preparation method thereof. The preparation method comprises the following steps: providing a polymer membrane coated with silver nanoparticles, and immersing the polymer membrane coated with the silver nanoparticles in a cobalt-nickel reducing solution for chemical deposition to prepare the composite separation membrane, wherein the cobalt-nickel reducing solution comprises cobalt salt, nickel salt and a reducing agent. According to the invention, the polymer separation membrane is modified, so that when the modified membrane filters Congo red, methylene blue and rhodamine, the modified membrane can be combined with an external electric field to prevent dye molecules from adhering to or penetrating through the separation membrane, the dye rejection and pollution resistance of the separation membrane are remarkably improved, and the separation membrane has extremely high water flux.

Description

technical field [0001] The invention relates to the technical field of polymer separation membrane surface modification, in particular to a conductive composite separation membrane and a preparation method thereof. Background technique [0002] In today's society, water scarcity is a major problem. In the textile and printing and dyeing industry, a large amount of high-chroma wastewater will be produced, causing serious environmental pollution. Many dyes are toxic in nature and are difficult to be biodegraded. The discharge of these dye wastewaters has caused a series of damages to ecosystems and human health. Textile wastewater pollution is very difficult in the water pollution treatment industry. [0003] Compared with other technologies, membrane separation has unique advantages in treating wastewater. Due to its simple process and high production efficiency, it is easy to apply to wastewater treatment. Textile and printing and dyeing wastewater are treated by membrane...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D69/02C02F1/44C02F1/48C02F103/30
CPCB01D67/0093B01D69/12B01D69/02C02F1/44C02F1/48B01D2325/26C02F2103/30Y02A20/131
Inventor 申利国林红军刘莹曾千千邓颖景乐
Owner ZHEJIANG NORMAL UNIVERSITY
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