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Method for preparing ZIF-8 composite film through electro-deposition and application of ZIF-8 composite film

A ZIF-8, electrodeposition technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult control of defects and uneven thickness, and achieve less defects, uniform thickness, and mild synthesis conditions. Effect

Pending Publication Date: 2021-07-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of uneven thickness and difficult control of defects in the existing preparation methods, the present invention provides a method for preparing a composite membrane with ZIF-8 as a separation layer by electrodeposition and its application

Method used

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  • Method for preparing ZIF-8 composite film through electro-deposition and application of ZIF-8 composite film
  • Method for preparing ZIF-8 composite film through electro-deposition and application of ZIF-8 composite film
  • Method for preparing ZIF-8 composite film through electro-deposition and application of ZIF-8 composite film

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specific Embodiment approach 1

[0031] Specific Embodiment 1: In this embodiment, a method for preparing a ZIF-8 composite film by electrodeposition uses analytically pure zinc acetate dihydrate and 2-methylimidazole dissolved in deionized water as raw materials, and conducts electrodeposition at normal temperature and pressure. Synthesize, specifically, carry out according to the following steps:

[0032] 1. Preparation of electrodeposition precursor solution: 2-methylimidazole and zinc nitrate dihydrate were completely dissolved in deionized water respectively to obtain 2-methylimidazole solution and zinc nitrate dihydrate solution, and the two solutions were mixed and stirred to obtain ZIF -8 precursor solution;

[0033] 2. Pretreatment of the base film: rinse the base film in deionized water and dry it, sputter and deposit precious metals on the base film to obtain a conductive base film;

[0034] 3. Electrodeposition: Using a two-electrode deposition system, fix the conductive base film and graphite pa...

specific Embodiment approach 2

[0037] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the molar ratio of 2-methylimidazole to zinc nitrate dihydrate in step 1 is (60-70):1. Others are the same as the first embodiment.

specific Embodiment approach 3

[0038] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that the 2-methylimidazole described in step 2 is dissolved in deionized water at a concentration of 0.8-1.2 mol / L. Others are the same as one of the specific embodiments 1 to 2.

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Abstract

The invention relates to a method for preparing a ZIF-8 composite film through electro-deposition and an application of the ZIF-8 composite film, and relates to the method for preparing the ZIF-8 composite film through electro-deposition and the application of the ZIF-8 composite film. The invention aims to solve the problems that the thickness is not uniform and the defect is difficult to control in an existing preparation method. The membrane is composed of a substrate membrane and a ZIF-8 separation layer; and the separation layer is a compact ZIF-8 crystal separation layer with uniform thickness, membrane holes are small and uniform, the membrane layer is uniform and thin in thickness, and the separation capacity for small molecular pollutants in water is high. The method comprises the steps: after a noble metal is sputtered on a substrate film for electric conduction, immersing the substrate film and graphite paper respectively serving as a working electrode and a counter electrode into an electrolytic tank containing a precursor solution, taking the substrate film as a cathode, and synthesizing through a one-step electrodeposition method at normal temperature and normal pressure. The prepared composite membrane shows excellent interception performance on small dye molecules, and the flux is larger than that of an MOFs composite membrane prepared through a traditional method. The ZIF-8 composite film is used for intercepting dye wastewater.

Description

technical field [0001] The invention relates to a method for preparing a ZIF-8 composite film by electrodeposition and its application. Background technique [0002] At present, due to many factors such as inappropriate discharge of industrial water into the environment, high utilization rate of chemical fertilizers in the agricultural field, and increased discharge of domestic water brought about by population growth, the problem of water pollution is one of the main problems of global environmental pollution, causing serious Lack of fresh water resources and ecological environment damage. With the development of industry, more and more synthetic dyes have replaced natural dyes for large-scale use in industry. There are more than 100,000 commercial dyes (about 70% by weight of azo dyes) at present. In the industrial dyeing process, not all dyes are attached to the surface, and the lost dyes produce dye wastewater. More than 1 million tons of dyes can be produced globally ...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/02B01D71/06B01D71/34C02F1/44C02F101/30
CPCB01D67/0002B01D69/12B01D71/06B01D61/027C02F1/442B01D71/025B01D71/34C02F2101/308
Inventor 马军吕东伟孙雪瑾蒋海成
Owner HARBIN INST OF TECH
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