Ultrafiltration/adsorption bi-functional film and preparation method thereof

A dual-function, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of difficult recovery of adsorbents, secondary pollution, etc., achieve high reuse rate, prevent secondary pollution, etc. Less pollution, easy to recycle

Inactive Publication Date: 2017-09-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that current adsorbents are difficult to recycle and easily cause secondary pollution, the present invention provides an ultrafiltration / adsorption dual-functional membrane and a preparation method thereof

Method used

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  • Ultrafiltration/adsorption bi-functional film and preparation method thereof
  • Ultrafiltration/adsorption bi-functional film and preparation method thereof
  • Ultrafiltration/adsorption bi-functional film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the mass ratio of polyethyleneimine, N,N-dimethylformamide, polyethersulfone and polyvinylpyrrolidone K30 as 0.6:75.4:16:8, weigh PEI and DMF solvents in conical flasks, place in in the oven until the PEI is completely dissolved. Then add PES and PVP K30, magnetically stir until homogeneous, heat in a constant temperature oil bath at 65°C, and dissolve under stirring at 500r / min for 6 hours. After it was completely dissolved, it was taken out from the oil bath, cooled to room temperature, and allowed to stand for 12 hours for defoaming to obtain a homogeneous casting solution.

[0024] Quickly pour the casting liquid onto a glass plate placed in an oven at 100°C for 1 hour, then use a film scraper to evenly coat the prepared casting liquid on the surface of the glass plate, and quickly place it in a 55°C gel bath ( The gel bath adopts water) to perform phase inversion to form a membrane; the obtained open-pore basement membrane is stored in deionized water...

Embodiment 2

[0027] According to the mass ratio of polyethyleneimine, N,N-dimethylformamide, polyethersulfone and polyvinylpyrrolidone K30 as 0.6:75.4:13:11, weigh PEI and DMF solvents in conical flasks, place in in the oven until the PEI is completely dissolved. Then add PES and PVP K30, magnetically stir until homogeneous, heat in a constant temperature oil bath at 65°C, and dissolve under stirring at 500r / min for 6 hours. After it was completely dissolved, it was taken out from the oil bath, cooled to room temperature, and allowed to stand for 12 hours for defoaming to obtain a homogeneous casting solution.

[0028] Quickly pour the casting liquid onto a glass plate placed in an oven at 100°C for 1 hour, then use a film scraper to evenly coat the prepared casting liquid on the surface of the glass plate, and quickly place it in a 55°C gel bath ( The gel bath adopts water) to perform phase inversion to form a membrane; the obtained open-pore basement membrane is stored in deionized wate...

Embodiment 3

[0030] Fix the membrane in Example 1 in the filter device, filter the sewage under the pressure of 0.010MPa, the As concentration of the influent is 96.3ppb, after the membrane penetrates, soak the bifunctional membrane in the NaOH solution of 0.5M to carry out To regenerate, repeat this operation again for three cycles. Figure 4 It can be seen that after being regenerated twice, the capacity of the dual-function ultrafiltration membrane to treat sewage is about 80% of that of the original membrane, which shows that the dual-function membrane has a good reuse rate.

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Abstract

The invention discloses ultrafiltration / adsorption bi-functional film and a preparation method thereof. The preparation method comprises the steps of firstly blending polyether sulfone, polyvinylpyrrolidone, polyethyleneimine and N,N-dimethylformamide so as to obtain film casting liquid, forming a film from the film casting liquid by virtue of an immerse precipitation method, reversely filtering dispersed hollow nano-Fe3O4 turbid liquid from the back of the film so as to fix nano-particles into finger-shaped holes of the film, and finally sealing big pores on the back of the film by virtue of an organic polymer, so as to obtain Fe3O4 encapsulated ultrafiltration / adsorption bi-functional film. According to the preparation method, the ultrafiltration / adsorption bi-functional film which is good in hydrophily, high in flux and retention rate and strong in heavy metal adsorption capacity is prepared by virtue of the immerse precipitation method and the reverse encapsulation of the Fe3O4 nano-particles. A preparation process of the ultrafiltration / adsorption bi-functional film is simple and relatively low in cost and has extremely high application values in the field of treatment of heavy metal ions and macromolecular pollutants.

Description

technical field [0001] The invention belongs to the field of functional membrane preparation, and relates to an ultrafiltration / adsorption dual-functional membrane and a preparation method thereof, in particular to an ultrafiltration membrane capable of filtering and simultaneously removing macromolecular pollutants and heavy metal ions and a preparation method thereof. Background technique [0002] With the continuous development of mining, metallurgy, copper smelting and other industries, the heavy metal pollution it brings is also becoming more and more serious, which seriously threatens human health. How to solve heavy metal pollution has become an urgent problem to be solved. At present, the most commonly used method for removing heavy metals is the adsorption method, but because most of the adsorbents are in the form of powder, there are disadvantages such as difficult recovery and easy to cause secondary pollution. Polymer membranes have obvious advantages in the ads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00B01D69/02B01D61/14C02F1/44C02F1/28C02F101/20
CPCB01D71/68B01D61/145B01D67/0088B01D69/02B01D2325/12C02F1/281C02F1/444C02F2101/20
Inventor 李健生张璇方小峰孙秀云沈锦优王连军
Owner NANJING UNIV OF SCI & TECH
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