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Preparation method of modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment

A technology for wastewater treatment and ultrafiltration membrane, applied in the field of membrane materials, can solve the problems of reduced membrane water flux, poor membrane hydrophilicity, and low surface energy, and achieve stable and lasting effects, good hydrophilicity, and large specific surface area. Effect

Active Publication Date: 2018-12-21
南京润科环境有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its low surface energy, the prepared membrane has poor hydrophilicity and is easily polluted by impurities in the water during water treatment, which reduces the water flux of the membrane and cannot be recovered.

Method used

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  • Preparation method of modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment
  • Preparation method of modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment

Examples

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Effect test

Embodiment 1

[0027] A method for preparing a modified PVDF ultrafiltration membrane for the treatment of complexed heavy metal wastewater, comprising the following steps:

[0028] 1. Surface grafted PS polymer brush: PVDF ultrafiltration membrane is placed in KOH concentration 2.5mol / L, tetrabutylammonium bromide 3g / L alkali solution, reaction temperature 55 ℃, reaction time 8min, the surface of the basement membrane gets carbon Carbon double bond, the treated PVDF ultrafiltration membrane is soaked in a PS monomer solution with a concentration of 1mol / L for 1h, taken out and washed off the excess solution, and put into a reaction system containing cross-linking agent MBAA and initiator for constant temperature reaction for 20min. The mass ratio of PS monomer to crosslinking agent is 10:0.3, and the PVDF ultrafiltration membrane with PS polymer brushes grafted on the surface is obtained;

[0029] 2. PPy coating: weigh FeCl 3 ·6H 2 Dissolve O in ultrapure water, soak the PVDF ultrafiltrat...

Embodiment 2

[0033] A method for preparing a modified PVDF ultrafiltration membrane for the treatment of complexed heavy metal wastewater, comprising the following steps:

[0034] 1. Surface grafted PS polymer brush: PVDF ultrafiltration membrane is placed in KOH concentration 2.5mol / L, tetrabutylammonium bromide 3.5g / L alkali solution, reaction temperature 60 ℃, reaction time 10min, the surface of the basement membrane is obtained Carbon-carbon double bond, the treated PVDF ultrafiltration membrane is soaked in a PS monomer solution with a concentration of 1.5mol / L for 1 hour, taken out to wash off the excess solution, and put into a reaction system containing a crosslinking agent MBAA and an initiator for constant temperature reaction 30min, the mass ratio of PS monomer and cross-linking agent is 10:0.5, obtains the PVDF ultrafiltration membrane that the surface is grafted with PS polymer brush;

[0035] 2. PPy coating: weigh FeCl 3 ·6H 2 Dissolve O in ultrapure water, soak the PVDF ul...

Embodiment 3

[0039] A method for preparing a modified PVDF ultrafiltration membrane for the treatment of complexed heavy metal wastewater, comprising the following steps:

[0040] 1. Surface grafted PS polymer brush: PVDF ultrafiltration membrane is placed in KOH concentration 2.5mol / L, tetrabutylammonium bromide 4g / L alkali solution, reaction temperature 65 ℃, reaction time 8min, the surface of the basement membrane gets carbon Carbon double bond, the treated PVDF ultrafiltration membrane is soaked in a PS monomer solution with a concentration of 2mol / L for 1h, taken out and washed off the excess solution, and put into a reaction system containing cross-linking agent MBAA and initiator for constant temperature reaction for 35min. The mass ratio of PS monomer to crosslinking agent is 10:0.7, and the PVDF ultrafiltration membrane with PS polymer brushes grafted on the surface is obtained;

[0041] 2. PPy coating: weigh FeCl 3 ·6H 2 Dissolve O in ultrapure water, soak the PVDF ultrafiltrat...

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Abstract

The invention discloses a preparation method of a modified PVDF ultrafiltration membrane for complexed heavy metal wastewater treatment. The preparation method comprises the following steps: 1, grafting polymer brushes on the surface; 2, coating with PPy; 3, loading TiO2 / WO3 through magnetron sputtering; 4, treating by using a silane coupling agent KH-792. By the preparation method of the modifiedPVDF ultrafiltration membrane, provided by the invention, the property of a PVDF base membrane can be retained; the modifying operation is simple; the cost is low; the obtained modified PVDF ultrafiltration membrane has high mechanical strength, is unlikely to be damaged during using and has a good antifouling property; through modification, the hydrophilicity and the antifouling property are improved, and the filtering effect can be improved; preparation and loading of a catalyst can be completed in one step according to a sputtering method; a TiO2 / WO3 photocatalyst is unlikely to agglomerate and is large in loading capacity and high in activity; filtration and the processes of catalytically degrading a complexing agent and adsorbing heavy metals can be completed simultaneously under natural light, so that the removal rate of dissolved heavy metals is greatly increased.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a method for preparing a modified PVDF ultrafiltration membrane used for complexing heavy metal wastewater treatment. Background technique [0002] Metal ore smelting, electrolysis, electroplating and other industries discharge a large amount of wastewater containing heavy metal ions every year. Heavy metal wastewater discharged into the environment cannot be degraded by microorganisms, and through soil, water, air, especially the food chain, it is harmful to human health, animals, plants and aquatic life. Serious hazard to organisms. In recent years, with the development of surface treatment technology, electroplating and electroless plating have been widely used, and complexing agents used in this process make the composition of heavy metal wastewater more complex. Take heavy metal wastewater in the electroplating industry as an example: electroplating wastewater co...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D67/00B01D69/02B01D71/78C02F1/28C02F1/30C02F1/44C02F101/20C02F103/16
CPCB01D61/145B01D67/0079B01D69/02B01D71/78B01D2325/10B01D2325/12B01D2325/36C02F1/281C02F1/285C02F1/30C02F1/444C02F2101/20C02F2103/16C02F2305/10
Inventor 杨晓飞
Owner 南京润科环境有限公司
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