Electrochemical membrane module for selectively removing pollutants and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11377373-B2
Application number	US-202016845093-A
Country	US
Kind code	B2
Filing date	Apr 10, 2020
Priority date	Jul 10, 2019
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

An electrochemical membrane module for selectively removing pollutants and a preparation method thereof are provided. A Ti/SnO2—Sb substrate electrode is coated with a MI—TiO2 sol-gel by means of a dip-coating method, and then sintered to obtain a molecular imprinting type Ti/MI—TiO2/SnO2—Sb coated electrode; the coated electrode is adhered to a ceramic micro-filtration membrane using epoxy resin glue to obtain a Ti/MI—TiO2/SnO2—Sb MI-anodic conductive composite membrane; the MI-anodic conductive composite membrane is used as an anode, and a titanium mesh is used as a cathode, so that the electrochemical membrane module capable of selectively removing pollutants is obtained. The invention effectively combines an electrochemical micro-filtration membrane and a molecular imprinting technique. When the electrochemical membrane module is used, suspended particles and refractory organics in the sewage are removed, and a highly selective removal of certain refractory pollutants can be achieved.

First claim

What is claimed is:

1. An electrochemical membrane module for selectively removing pollutants, comprising a membrane bracket, MI-anodic composite membranes, and a titanium mesh, wherein the membrane bracket is provided with a suction port connecting with an inner cavity of the membrane bracket, the inner cavity of the membrane bracket is internally provided with the titanium mesh as a cathode, and both outer sides of the membrane bracket are provided with the MI-anodic composite membranes, and each of the MI-anodic composite membranes comprises a Ti—SnO 2 —Sb substrate electrode and a ceramic micro-filtration membrane, wherein the Ti—SnO 2 —Sb substrate electrode is opposite to the inner cavity of the membrane bracket, and the Ti—SnO 2 —Sb substrate electrode is coated with a MI—TiO 2 sol-gel coating;
wherein the Ti—SnO 2 —Sb substrate electrode is obtained by preparing a sol-gel having a Sn:Sb of 9:1, coating the sol-gel on the titanium mesh having a pore diameter of 100 μm and a thickness of 200 μm, and sintering the titanium mesh.

2. A method for preparing the electrochemical membrane module according to claim 1 , comprising the steps of:
(1) immersing the Ti—SnO 2 —Sb substrate electrode in the MI—TiO 2 sol-gel, removing the Ti—SnO 2 —Sb substrate electrode from the MI—TiO 2 sol-gel and sintering the Ti—SnO 2 —Sb substrate electrode to obtain a coated electrode coated with the MI—TiO 2 sol-gel coating on a surface of the coated electrode, and then adhering the coated electrode to a surface of the ceramic micro-filtration membrane by epoxy resin, to obtain the MI-anodic composite membranes;
(2) vertically disposing the titanium mesh m the membrane bracket as the cathode, and adhering two of the MI-anodic composite membranes obtained in the step (1) to the both outer sides of the membrane bracket directly opposite to the cathode, wherein the Ti—SnO 2 —Sb substrate electrode is placed opposite to the inner cavity of the membrane bracket.

3. The method according to claim 2 , wherein the MI—TiO 2 sol-gel is prepared by adding titanium alkoxide and a template molecule into first absolute ethanol and stirring to obtain a molecular imprinting precursor solution, then mixing water, second absolute ethanol and glacial acetic acid under stirring to obtain a reaction medium solution, and finally adding the reaction medium solution to the molecular imprinting precursor solution dropwise under stirring.

4. The method according to claim 3 , wherein the titanium alkoxide is at least one of tetrabutyl titanate, isopropyl titanate and titanium isopropoxide.

5. The method according to claim 3 , wherein the template molecule is at least one of 2,4-dichlorophenoxyacetic acid, 3,4-dichlorophenoxyacetic acid, 2,3-dichlorophenoxy acetic acid and p-chlorophenol.

6. The method according to claim 3 , wherein a molar ration of the template molecule, the titanium alkoxide, a sum of the first absolute ethanol and the second absolute ethanol, the glacial acetic acid, and to the water is 0.5:1:18:2:8.

Assignees

• Univ Tongji

Inventors

• Wang Zhiwei
• Chen Mei
• Wu Zhichao

Classifications

• B01D69/12 Primary

  Composite membranes; Ultra-thin membranes · CPC title

• B01D71/02

  Inorganic material · CPC title

• B01D2321/18

  Use of gases · CPC title

• C02F2209/38

  Gas flow rate · CPC title

• B01D2311/2688

  Biological processes · CPC title