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

CN109999666APending Publication Date: 2019-07-12RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
Publication Date: 2019-07-12

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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.

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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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