Bipolar membrane using zinc-metal organic framework material as middle interface layer and preparation method thereof

Abstract

The invention relates to a bipolar membrane using a zinc-metal organic framework material as a middle interface layer and a preparation method thereof. The middle interface layer of the bipolar membrane is characterized in that the inner surfaces of a cation exchange membrane layer and an anion exchange membrane layer are crosslinked or coated with a zinc-metal organic framework material catalyst.The preparation method comprises the following steps of firstly, casting an anion exchange membrane to a clean glass plate by a gradual-layer casting method, and air-drying at room temperature, so asto obtain the anion exchange membrane; then, casting a middle interface layer membrane liquid to the surface of the anion exchange membrane by a chemical crosslinking or physical adsorption method, and drying, so as to form the middle interface layer; finally, casting the cation exchange membrane to the surface of the middle interface layer to form the cation exchange membrane layer, and drying,so as to obtain the bipolar membrane. The prepared bipolar membrane has the advantages that the water dissociation rate is high, the water dissociation voltage is low, the density of working current is high, the property is stable, the service life is long, and the like; the bipolar membrane is suitable for the sustained operation of converting nitrogen gas into ammonia.

Description

technical field [0001] The invention relates to a bipolar membrane and a preparation method thereof, in particular to a bipolar membrane with a zinc-metal organic framework material as an intermediate interface layer and a preparation method thereof. Background technique [0002] The bipolar membrane is composed of a cation exchange membrane layer, an anion exchange membrane layer and an intermediate interface layer. Under the action of a direct current electric field, the water in the intermediate interface layer dissociates to generate hydrogen ions and hydroxide ions and enter the anion and anode chambers respectively. ; The water dissociation efficiency of the middle interface layer of the bipolar membrane is one of the key factors to measure the superiority of the performance of the bipolar membrane. Bipolar membranes with excellent properties can be prepared in a timely manner. Chen Zhen et al. reported the modification of metal phthalocyanine derivatives (Chinese inve...

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Problems solved by technology

[0003] The atmosphere is rich in nitrogen, most of which are N 2 Exists in the form of N, it is difficult to be directly absorbed by organisms, and N 2 It can only be absorbed and utilized by transforming into a nitrogen-containing compound; the free N 2 The conversion of ammonia to ammonia is one of the hotspots in the field of photocatalysis; however, due to the large bond energy of N≡N (940 kJ·mol -1 ), it is difficult to be activated, resulting in very low nitrogen reduction efficiency, and because the process of reducing nitrogen to ammonia needs to consume a large amount of H + , so that the cathode chamber electrolyte will gradually become alkaline, on the one hand, it will lead to a decrease in the catalytic activity of the cathode material, which is not conducive to the continuous progress of the catalytic reaction; on the other hand, it will make the H in the electrolyte + Insufficient supply, resulting in lower recovery rates

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