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Titanium dioxide nanometer pipe composite separating membrane, its preparation and use thereof

A nanotube composite and titanium dioxide technology, applied in the field of environmental pollution control, can solve the problems of membrane pollution, small loading area, and high cost of inorganic membranes, and achieve the effects of large photocatalytic activity, high removal efficiency, and large specific surface area

Inactive Publication Date: 2006-03-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The disadvantages of inorganic membranes are their high cost, small filling area, high operating costs, serious membrane pollution, and only play a role in separation, etc.
And the main problem that this method is more difficult to industrialize is: (1) the catalyst particles are easy to lose with the treatment liquid, and it is difficult to recycle; (2) due to the TiO 2 It is a wide bandgap semiconductor with a bandgap width of 3.2eV, which requires higher energy light irradiation to excite and generate photoinduced electrons and holes
[0024] 3. Due to TiO 2 The powder is relatively fine, resulting in serious fouling of the separation membrane and a rapid decrease in membrane flux;
[0025] 4. TiO 2 Powder photocatalyst is easy to lose
[0033] 2. TiO immobilized by this way 2 Powder, not firm on the surface of the film, easy to lose;

Method used

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  • Titanium dioxide nanometer pipe composite separating membrane, its preparation and use thereof
  • Titanium dioxide nanometer pipe composite separating membrane, its preparation and use thereof
  • Titanium dioxide nanometer pipe composite separating membrane, its preparation and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0079] For the treatment of organic pollutant wastewater with small molecular size and small amount of wastewater, such as pesticides, when the permeation flux of the composite separation membrane is required to be small, the titanium dioxide nanotube composite separation membrane prepared under the following conditions can be applied. This composite separation Membranes can meet the needs of laboratory research.

[0080] Al with a pore size of 20nm, a diameter of 25mm, a thickness of 50μm, a pore spacing of 40-80nm, and a porosity of 30% 2 o 3 The inorganic membrane is used as a carrier to prepare a titanium dioxide nanotube composite separation membrane with a pore size of 5-10 nm. The steps are:

[0081] The first step, the pretreatment of the carrier

[0082] al 2 o 3 The inorganic diaphragm was ultrasonically cleaned with deionized water for 20 minutes, then washed with acetone and deionized water for 10 minutes, dried in an oven at 50°C, cooled to room temperature, a...

Embodiment 2

[0089] For the treatment of wastewater with large molecular size organic pollutants, such as dyes, polychlorinated biphenyls, etc., the titanium dioxide nanotube composite separation membrane prepared under the following conditions can be applied. This composite separation membrane can meet the requirements of laboratory research and a small amount of actual wastewater treatment need.

[0090] Al with a pore size of 100nm, a diameter of 47mm, a thickness of 60μm, a pore spacing of 30-60nm, and a porosity of 40% 2 o 3 The inorganic membrane is used as a carrier to prepare a titanium dioxide nanotube composite separation membrane with a pore size of 40-50 nm. The steps are:

[0091] The first step, the pretreatment of the carrier

[0092] al 2 o 3 The inorganic diaphragm was ultrasonically cleaned with deionized water for 15 minutes, then washed with acetone and deionized water for 10 minutes, dried in an oven at 100°C, cooled to room temperature, and set aside.

[0093] Th...

Embodiment 3

[0099] For the treatment of organic pollutant wastewater with large molecular size, such as dye and surfactant wastewater, the titanium dioxide nanotube composite separation membrane prepared under the following conditions can be applied. This composite separation membrane can meet the requirements of laboratory research and a small amount of actual wastewater treatment. need.

[0100] Al with a pore size of 200nm, a diameter of 47mm, a thickness of 60μm, a pore spacing of 20-50nm, and a porosity of 50% 2 o 3 The inorganic membrane is used as a carrier to prepare a titanium dioxide nanotube composite separation membrane with a pore size of 50-80 nm. The steps are:

[0101] The first step, the pretreatment of the carrier

[0102] al 2 o 3 The inorganic diaphragm was ultrasonically cleaned with deionized water for 20 minutes, then washed with acetone and deionized water for 20 minutes, dried in an oven at 50°C, cooled to room temperature, and set aside.

[0103] The second ...

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Abstract

A composite separating membrane with TiO2 nano-tubes for treating the organic sewage is prepared through providing inorganic Al2O3 membrane, preparing the high-density through nanoholes on it to obtain carrier, washing, baking at 50-100 Deg C., preparing TiO2 sol at 15-20 Deg C., ultrasonic dispersing, immersing said Al2O3 membrane in it, drying, calcining and cooling.

Description

technical field [0001] The present invention relates to the use of Al 2 o 3 Titanium dioxide nanotube composite separation membrane as carrier and template and its preparation method and application, especially through the preparation of this composite separation membrane, the two mutually independent unit operations of photocatalysis and membrane separation are combined into one unit operation, making it The invention has the function of photocatalysis-separation integration and belongs to the technical field of environmental pollution control. Background technique [0002] The development of inorganic membranes began in the 1940s and has gone through three stages: the first stage began in the Manhattan Project during World War II, which was mainly used for the separation and enrichment of uranium isotopes; the second stage began in the 1980s, Inorganic membranes have entered the field of industrial applications, and industrial inorganic microfiltration membranes, inorgan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12
Inventor 全燮张海民赵慧敏赵雅芝陈硕
Owner DALIAN UNIV OF TECH
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