A kind of anion selective separation membrane and its application

Abstract

The invention discloses an anion selective separating membrane and application thereof. The separating membrane is prepared through the following method, and the method includes the steps that bromized polyphenyl ether and 1-methyl-2-pyrrolidone are mixed to be uniform to obtain a bromized polyphenyl ether solution; the bromized polyphenyl ether solution is applied to a glass plate, and the glass plate is put on a flat heater to be dried to obtain a bromized polyphenyl ether membrane; at the room temperature, the bromized polyphenyl ether membrane is soaked in a polyethyleneimine water solution for 8-24 h, taken out and flushed with deionized water to obtain a grafted bromized polyphenyl ether membrane; the grafted bromized polyphenyl ether membrane is soaked in a trimethylamine water solution for 24 h at the room temperature, taken out and dried to obtain the anion selective separating membrane. The anion selective separating membrane is simple in preparing process, only simple soaking is needed, the complex processes including electro-deposition and layer-by-layer self-assembly in the prior art are omitted, and the problem that a modified layer electrostatically adsorbed on the surface of a modified membrane falls off is solved. The basic performance indexes, such as ion exchange capacity and mechanical strength, of the membrane are almost the same as those before modification.

Description

(1) Technical field [0001] The invention relates to a separation membrane, in particular to a preparation method and application of a simple and effective anion selective separation membrane. (2) Background technology [0002] With the improvement of people's living standards, more and more attention is paid to the safety of drinking water. The safety of water in cities can still be guaranteed, but the safety of domestic water in some remote mountainous areas and villages cannot be guaranteed. For example: the concentrations of fluoride ions and nitrate ions in drinking water seriously exceed the standard, and drinking such water for a long time will definitely cause harm to people's health. If you drink water with excessive fluoride for a long time, it will cause skeletal fluorosis and dental fluorosis, which will bring pain to the body; for water with excessive nitrate, the nitrate will change into nitrite in the body, which is carcinogenic especially Harmful to young ch...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of anion selective separation membrane, utilize the bromomethyl part in BPPO and the amine in PEI to react to make PEI covalently grafted on the surface of the membrane, obtain monovalent, polyvalent anion through quaternization treatment Selectively separated membranes and their application in drinking water purification and seawater desalination solve the problems in the prior art that the preparation of monovalent selective membranes is complicated and the modified layer is easy to fall off and cannot be used for a long time

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