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Multifunctional photocatalysis composite ceramic separation membrane as well as preparation method and use thereof

A technology of composite ceramics and porous ceramic membranes, applied in catalyst activation/preparation, chemical instruments and methods, semi-permeable membrane separation, etc., can solve problems such as limited photocatalytic activity, low membrane effluent flux, and loss of porosity. High adsorption separation performance and photocatalytic ability, simple preparation and application process, and the effect of reducing porosity loss

Active Publication Date: 2009-08-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ceramic membrane has the advantages of high temperature resistance, good chemical stability, high mechanical strength, strong antimicrobial ability and narrow pore size distribution, and has better application value, but there are still shortcomings: (1) For the separated pollution (2) The membrane is easy to foul, the membrane flux drops rapidly, the operation cycle is short, and frequent flushing is required, so the operation cost is high
Although photocatalytic technology has many advantages, there are the following main problems in the process of industrial application of powder photocatalysts: (1) powder catalyst particles are easy to lose and difficult to recycle; (2) titanium dioxide photocatalysts usually have a spectrum utilization range Narrow, after being excited by ultraviolet light, electrons and holes are easy to recombine, resulting in limited photocatalytic activity
However, these two patented technologies still have the following deficiencies: (1) photogenerated electrons and holes are easy to recombine under ultraviolet light irradiation, resulting in insufficient photocatalytic degradation of pollutants and insufficient sterilization activity; The efficiency loss is large, and the membrane water flux is low in practical applications

Method used

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  • Multifunctional photocatalysis composite ceramic separation membrane as well as preparation method and use thereof
  • Multifunctional photocatalysis composite ceramic separation membrane as well as preparation method and use thereof
  • Multifunctional photocatalysis composite ceramic separation membrane as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] When the permeation flux of the composite membrane is required to be small or the pore size is small, the multifunctional photocatalytic composite ceramic separation membrane prepared under the following conditions can be applied.

[0054] ZrO with a pore size of 200nm and a porosity of 25% 2 The ceramic membrane is used as a carrier to prepare a multifunctional photocatalytic composite ceramic separation membrane with a pore size of 100-150nm. The steps are:

[0055] The first step, the pretreatment of the carrier

[0056] ZrO will be used as carrier 2 The ceramic membrane was cleaned with deionized water and dried at 40°C, then cooled down to room temperature naturally for later use;

[0057] The second step, the preparation of hydroxyapatite sol

[0058] Diammonium hydrogen phosphate and calcium nitrate solutions were prepared at a molar ratio of 3:5, and the respective pH values ​​were adjusted to 7 with ammonia water. Slowly drop the diammonium hydrogen phospha...

Embodiment 2

[0067] For the treatment of source water containing NOMs, bacteria, algae, etc., such as the treatment of five types of surface water as drinking water sources, the multifunctional photocatalytic composite ceramic separation membrane prepared under the following conditions can be used.

[0068] Al with a pore size of 1000nm and a porosity of 50% 2 0 3 The inorganic membrane is used as a carrier to prepare a multifunctional photocatalytic composite ceramic separation membrane with a pore size of 850-950nm. The steps are:

[0069] The first step, the pretreatment of the carrier

[0070] Al will be used as carrier 2 o 3 After the inorganic membrane was washed with deionized water and dried at 70°C, the temperature was naturally cooled to room temperature for later use;

[0071] The second step, the preparation of hydroxyapatite sol

[0072]Diammonium hydrogen phosphate and calcium nitrate solutions were prepared at a ratio of 3:5, and the respective pH values ​​were adjusted...

Embodiment 3

[0081] For the treatment of source water containing suspended solid particles and containing NOMs, bacteria, algae, etc., the multifunctional photocatalytic composite ceramic separation membrane can be prepared under the following conditions.

[0082] SiO with a pore size of 2000nm and a porosity of 60% 2 The inorganic membrane is used as a carrier to prepare a multifunctional photocatalytic composite ceramic separation membrane with a pore size of 1800-1900nm. The steps are:

[0083] The first step, the pretreatment of the carrier

[0084] SiO will be used as carrier 2 The inorganic membrane was washed with deionized water and dried at 100°C, then cooled down to room temperature naturally for later use;

[0085] The second step, the preparation of hydroxyapatite sol

[0086] Diammonium hydrogen phosphate and calcium nitrate solutions were prepared at a ratio of 3:5, and the respective pH values ​​were adjusted to 11 with ammonia water. Slowly drop the diammonium hydrogen ...

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Abstract

The invention belongs to the technical field of membrane and relates to a photocatalytic composite ceramic separation membrane using porous ceramic membrane as a carrier, a method for preparing the same and application of the separation membrane. The method is characterized in that a porous ceramic membrane substrate is used as the carrier to prepare hydroxyapatite sol and argent-titania composite sol through sol-gel technology; and a carrier membrane is subjected to secondary sol-gel dipping, drying and roasting sequentially to obtain the argent-carried titania / hydroxyapatite photocatalytic composite ceramic separation membrane with aperture of between 100 and 1,900 nm and porosity of between 20 and 55 percent. The photocatalytic composite ceramic separation membrane has biological adsorption and high photocatalytic activity and membrane permeability, improves separation of the composite membrane, photocatalytic degradation and sterilization, has remarkable effects of decontamination and sterilization, reduces the loss of porosity in the process of membrane preparation, has a simple preparation and application process, is easy for large-scale industrial production, integrates three units of membrane separation, photocatalytic degradation and sterilization and reduces investment and occupied area.

Description

technical field [0001] The invention relates to a separation membrane product and its preparation method and application, more specifically, to a photocatalytic composite ceramic separation membrane with a porous ceramic membrane as a carrier, its preparation method and application, and belongs to the field of membrane technology. Background technique [0002] Natural water bodies contain natural organic matter (NOMs) and synthetic organic matter (SOCs). There are about 10-20 kinds of natural organic matter. In the process of surface and groundwater source water treatment, organic humus is the most common natural organic pollutant. With traditional chlorine disinfection methods, NOMs in water will react with excess chlorine to form carcinogenic Disinfection by-products (DBPs) are extremely harmful to human health; the main characteristics of artificially synthesized organic substances are easy to remain and difficult to degrade, and at the same time have bioaccumulation, str...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01J21/06B01J35/04B01J37/02C02F1/44C02F1/32C02F1/72
Inventor 全燮马宁张耀斌陈硕赵慧敏
Owner DALIAN UNIV OF TECH
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