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A catalytic functional ceramic membrane and its preparation method and application

A ceramic membrane and functional technology, which is applied in the field of catalytic functional ceramic membrane and its preparation, can solve the problems of catalyst agglomeration, low ceramic membrane flux, and insufficient catalytic performance, and achieve improved catalytic efficiency, high specific surface area, and water permeability excellent effect

Active Publication Date: 2021-10-19
HARBIN INST OF TECH AT WEIHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing loading technology is mainly direct doping, which leads to the agglomeration of the catalyst, and the combination is not good, and the loss of active substances is easy to occur, resulting in heavy metal pollution in water.
In addition, the flux of the ceramic membrane is low, and there are disadvantages such as poor removal of organic matter; moreover, compared with the powder catalyst, the specific surface area of ​​the catalyst is reduced due to the sintering of the ceramic membrane, and the content of active components in the membrane catalyst per unit volume remains the same. Less, catalytic performance is not high enough
Therefore, the preparation of high-performance membrane catalysts remains a challenge

Method used

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  • A catalytic functional ceramic membrane and its preparation method and application

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preparation example Construction

[0015] In a first aspect, the present invention provides a method for preparing a catalytic functional ceramic membrane, the method comprising the following steps:

[0016] (1) Preparation of catalytically active particles: using a metal-organic framework compound as a carrier to prepare an inverse microemulsion containing an active catalyst, after demulsification by a demulsifier, the active catalyst is supported on the carrier, and the separated precipitate is separated and dried , to produce catalytically active particles;

[0017] (2) Preparation of ceramic membrane blend: blending ceramic membrane raw material powder, hydroxymethyl cellulose, polyethylene glycol, the catalytically active particles and water to obtain a ceramic membrane blend;

[0018] (3) Preparation of the mixed mud: mixing the ceramic membrane blend and leaving it to stand to obtain the mixed mud;

[0019] (4) Forming of sintered preform: molding the mixed mud into a sintered preform;

[0020] (5) Sin...

Embodiment 1

[0048] The method for preparing a catalytic functional ceramic membrane in this embodiment comprises the following steps:

[0049] (1) Preparation of catalytically active particles: UiO-66 is used as a carrier for catalytically active molecules; the active catalyst is prepared by the reverse microemulsion method, wherein the continuous phase is n-hexane, and the surfactant is CTAB (cetyltrimethyl bromide ammonium), n-butanol as a stabilizer, water as a dispersed phase, adding Ce(NO 3 ) 3 6H 2 O and Fe(NO 3 ) 3 9H 2 After stirring the aqueous solution of O to form a stable microemulsion, add an appropriate amount of ammonia water to adjust the pH to 10, add a small amount of tetrahydrofuran and 1g / L UiO-66 to load, after breaking the emulsion, wash it repeatedly with water for 3 times, dry it, and grind it with a ball mill Become a 500-mesh particle to obtain an active catalyst;

[0050] (2) Preparation of ceramic membrane blends: select Al 2 o 3 As a ceramic matrix, th...

Embodiment 2

[0056] The method is basically the same as in Example 1, except that a zeolite imidazolate framework material (ZIF) is used instead of a Zr-based metal-organic framework compound (UiO-66) as a metal-organic framework compound.

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Abstract

The invention provides a method for preparing a catalytic functional ceramic membrane, the method comprising the following steps: preparing catalytically active particles through an inverse microemulsion; preparing a ceramic membrane blend; (3) preparing a mixed sludge; preparing by sintering Forming the preform: sintering the sintered preform with gradient temperature rise to obtain the ceramic membrane. The invention also provides the catalytic ceramic membrane prepared by the method and the application of the catalytic ceramic membrane in water treatment. The catalytic ceramic membrane of the present invention forms a bicontinuous phase structure, no heavy metal leaching is detected for a long time; the water permeability is excellent; the removal rate of turbidity is more than 99.9%; the removal rate of dissolved organic carbon (DOC) is more than 85%; the removal of total organic carbon rate above 80%; COD Mn The removal rate is more than 85%; under the same oxidant dosage, the catalytic efficiency is more than 20% higher than that of the catalytic ceramic membrane prepared by the impregnation method and the doping method.

Description

technical field [0001] The invention relates to the technical field of catalytic ceramic membranes, in particular to a catalytic functional ceramic membrane and its preparation method and application Background technique [0002] As my country's population continues to grow and industrialization continues to develop, water pollution caused by industrial discharges seriously restricts the living standards of Chinese residents. The traditional flocculation-sedimentation-filtration process is difficult to ensure the safety of drinking water for residents. In recent years, advanced water treatment technologies represented by membrane separation technology and advanced oxidation technology have gradually attracted attention. However, at present, the market is dominated by polymer membrane materials, and material aging will occur in the advanced oxidation process, resulting in a large loss of membrane performance, a decrease in service life, and an increase in operating costs. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02C02F1/44C02F1/72B01J23/34B01J23/83B01J27/224C04B35/10C04B35/46C04B35/48C04B35/565C04B35/622C02F101/20C02F101/30
CPCB01J23/34B01J23/83B01J27/224C02F1/44C02F1/725C02F2101/20C02F2101/30C04B35/10C04B35/46C04B35/48C04B35/565C04B35/62218
Inventor 程喜全马军张瑛洁张国宇王凯
Owner HARBIN INST OF TECH AT WEIHAI
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