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Catalytic functional ceramic membrane as well as preparation method and application thereof

A ceramic membrane and functional technology, applied in the field of catalytic functional ceramic membrane and its preparation, can solve the problems of catalyst agglomeration, low flux of ceramic membrane, low content of active components, etc., and achieve improved catalytic efficiency, high catalytic activity, The effect of large specific surface area

Active Publication Date: 2020-12-04
HARBIN INST OF TECH AT WEIHAI +1
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  • 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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  • Catalytic functional ceramic membrane as well as preparation method and application thereof

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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 preparation method of a catalytic functional ceramic membrane. The method comprises the following steps: preparing catalytic active particles by using a reversed-phase microemulsion; preparing a ceramic membrane blend; (3) preparing a mixed pug; and preparing a molded prefabricated body through sintering: carrying out gradient heating sintering on a sintered prefabricatedbody to prepare the ceramic membrane. The invention also provides the catalytic ceramic membrane prepared by the method and application of the catalytic ceramic membrane in water treatment. The catalytic ceramic membrane provided by the invention forms a bicontinuous phase structure, and no heavy metal is leached after long-time test; the water permeability is excellent; the turbidity removal ratereaches 99.9 percent or higher; the removal rate on dissolved organic carbon (DOC) is more than 85%; the total organic carbon removal rate is 80% or above; the removal rate of CODMn is 85% or above;under the condition of the same oxidant dosage, the catalytic efficiency is improved by more than 20% compared with the catalytic efficiency of a catalytic ceramic membrane prepared by an impregnationmethod and a 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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IPC IPC(8): C02F1/44C02F1/72B01J23/34B01J23/83B01J27/224C04B35/10C04B35/46C04B35/48C04B35/565C04B35/622C02F101/20C02F101/30
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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