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High-throughput positively-charged acid-resistant nanofiltration membrane as well as preparation method and application thereof

A positively charged and acid-resistant technology, which is applied in the field of membrane preparation, can solve the problems of low flux and achieve the effects of simple preparation method, improved flux and wide application prospects

Pending Publication Date: 2019-07-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most acid-resistant nanofiltration membranes are negatively charged nanofiltration membranes, the rejection rate and acid permeability of multivalent cations need to be improved, and the flux is low, only 2.0-3.0LMH / bar

Method used

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  • High-throughput positively-charged acid-resistant nanofiltration membrane as well as preparation method and application thereof
  • High-throughput positively-charged acid-resistant nanofiltration membrane as well as preparation method and application thereof
  • High-throughput positively-charged acid-resistant nanofiltration membrane as well as preparation method and application thereof

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preparation example Construction

[0018] The invention discloses a method for preparing a high-throughput positively charged acid-resistant nanofiltration membrane, which is characterized in that the preparation method includes the following steps:

[0019] S1: Immerse the ultrafiltration basement membrane in the prepared aqueous phase solution to react, and obtain the ultrafiltration basement membrane 1 after drying;

[0020] S2: immerse ultrafiltration base membrane 1 into the oil phase solution to react to obtain ultrafiltration base membrane 2;

[0021] S3: A high-throughput positively charged and acid-resistant nanofiltration membrane is obtained after two heat treatments of the ultrafiltration base membrane.

[0022] Wherein, the heat treatment temperature in the step S3 is 20-100° C., for example, 70° C., and the heat treatment time is 1 min-120 min, for example, 5 min.

[0023] Wherein, the steps S1-S3 are all reacted under normal pressure.

[0024] Wherein, after the step S3 is finished, it is rinse...

Embodiment 1

[0068] Weigh 5g of polyethylene amine with a molecular weight of 1800, 1.0g of triethylamine, 0.15g of sodium dodecylsulfonate, add deionized water to 500ml, fully disperse and stir for 12 hours; weigh 0.1g of trimer For cyanogen chloride, dissolve it in 500ml of n-hexane solvent and stir it fully for 12 hours; soak the polyethersulfone ultrafiltration membrane soaked in deionized water in the aqueous phase solution for 10 minutes, take it out and dry it in the air at 25°C It was immersed in the oil phase solution for 2 minutes, and it was heat treated at 30°C for 120 minutes, and then cleaned with deionized water. At room temperature, its flux was measured, which was 40LMH / MPa, and its response to 2g / LMgCl was measured. 2 The cut-off rate is 91%, and the Zeta potential of its surface is 16mV, this high-throughput positively charged acid-proof nanofiltration membrane is soaked in 25 ℃, 3wt% hydrochloric acid, and measures its to 2g / LMgCl 2 The curve graph of the rejection rate...

Embodiment 2

[0071] Weigh 1.25g polyethyleneimine with molecular weights of 600, 1800, 10000, 25000, 1.0g sodium hydroxide, 0.15g sodium dodecylbenzenesulfonate, add deionized water to 500ml, fully disperse and stir them 12 hours; Weigh 0.025g of cyanuric chloride, dissolve it in 500ml of n-hexane solvent, fully stir for 12 hours; soak the polysulfone ultrafiltration membrane soaked in deionized water in the aqueous phase solution for 10min, take it out and let it dry Dry, immerse it in the oil phase solution at 25°C for 3 minutes, heat it at 70°C for 5 minutes, then wash it with deionized water, measure its flux at room temperature, it is 80LMH / MPa, measure its effect on 2 / LMgCl 2 The rejection rate is 92%, and the Zeta potential of its surface is 26mV.

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Abstract

The invention discloses a high-throughput positively-charged acid-resistant nanofiltration membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: immersing an ultrafiltration base membrane into a prepared water-phase solution to react, and carrying out drying to obtain an ultrafiltration base membrane I; immersing the ultrafiltrationbase membrane I into an oil-phase solution to react to obtain an ultrafiltration base membrane II; and carrying out heat treatment on the ultrafiltration base membrane II to obtain the high-throughput positively-charged acid-resistant nanofiltration membrane. The throughput of the nanofiltration membrane prepared by using the preparation method is increased by 100%-250% on the premise that the acid resistance and the salt retention rate are guaranteed; in addition, the preparation method is simple, capable of easily realizing industrial production and wide in application prospect; and by using the high-throughput positively-charged acid-resistant nanofiltration membrane prepared by using the preparation method, the multivalent cation retention rate and the acid permeability are increased.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a high-throughput positively charged and acid-resistant nanofiltration membrane, a preparation method and application thereof. Background technique [0002] Nanofiltration is a membrane separation technology that has emerged in recent years. Due to its own characteristics, it has a high removal effect on organic matter with a molecular weight between 200 and 1000 Da, and can retain some ions that are beneficial to the human body. At present, nanofiltration has been widely used in water purification, industrial wastewater treatment and other fields. Among them, nanofiltration technology is widely used in strong acid environment, such as strong acid to be treated liquid (industrial acid extraction waste liquid, acid cleaning liquid, electroplating industry Heavy metal recovery, acid recovery, biomass separation and water purification in acid-containing wastewater, meta...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/56B01D71/68C02F1/44
CPCB01D61/027B01D67/0002B01D69/02B01D71/56B01D71/68B01D2325/16C02F1/442
Inventor 王军俞灵赵长伟侯得印张勇徐莉莉曹爱新
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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