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Prepn process of photocatalytic filtering net of foamed metal carrying nano Tio2

A foam metal and filter mesh technology, which is used in catalyst activation/preparation, chemical instruments and methods, filtration and separation, etc., can solve the problems of large air resistance, poor mechanical strength, and small load area, and achieve good air permeability and load capacity. Large, high photocatalytic activity

Inactive Publication Date: 2004-04-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses titanium trichloride as a precursor, which can reduce the emission of organic matter in the preparation process of photocatalytic materials; uses metal foam as a matrix material for loading, and effectively solves the problem of small loading area, large air resistance, and poor mechanical strength of common loading materials. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Preparation of sol with tetrabutyl titanate as precursor: tetrabutyl titanate is used as precursor, the molar concentration of tetrabutyl titanate is 0.2mol / L, and the preparation process of sol is as follows: 6.81ml titanium Add tetrabutyl ester to 90.91ml of ethanol solution, add 1.92ml of diethanolamine dropwise while stirring, after fully stirring, then add 0.36ml of water and 0.1ml of ethyl orthosilicate dropwise while stirring, and mix the above well-stirred The solution was airtight and allowed to age for one day to obtain a transparent sol.

[0015] 2. Foam metal nickel (area density 420g / m 2 , thickness 2.0mm) pre-oxidized at 150°C for 60 minutes, cooled, then soaked the pretreated foamed metal nickel in the above sol for 3 minutes, took it out, and centrifuged the excess metal foam attached to the pores The sol was spin-dried and soaked for the second time after natural drying for 30 minutes. Finally, keep it in the heating furnace at 550°C for 2 hours, a...

Embodiment 2

[0017] 1. Preparation of sol with titanium trichloride as precursor: Add 10 ml of ammonia water to 20 ml of titanium trioxide solution to form black precipitate, filter the precipitate, wash and dry at room temperature. Take 1.25g of the above-mentioned black precipitate, add 20ml of hydrogen peroxide solution, add 70ml of distilled water during the reaction, and keep stirring, when the reaction ends, the solution is a transparent brown-red solution, and finally TiO 2 The concentration of the sol is 0.15mol / L, and it is stored for use.

[0018] 2. Foam metal nickel (area density 420g / m 2 , thickness 2.0mm) at 750 ° C for 2 minutes, cooled, then soaked the pretreated foamed metal nickel in the above sol for 3 minutes, took it out, and centrifuged the excess metal foam attached to the pores The sol was spin-dried and soaked for the second time after natural drying for 30 minutes. Finally, keep it in the heating furnace at 550°C for 1 hour to form TiO on the surface of the foam...

Embodiment 3

[0020] 1. Preparation of sol with tetrabutyl titanate as precursor: tetrabutyl titanate is used as precursor, and the molar concentration of tetrabutyl titanate in the precursor solution is 1mol / L. The preparation process of sol is as follows: Add 34.04ml tetrabutyl titanate to 54.59ml ethanol solution, add 9.62ml diethanolamine dropwise while stirring, after fully stirring, add 1.75ml water dropwise while stirring, add 2g powdered TiO2 to the above sol 2 , fully stirred, the mixed sol solution was airtight and allowed to stand for a day to age it for later use.

[0021] 2. The preparation of the loaded photocatalytic filter screen: foam metal nickel (area density 370g / m 2 Thickness 1.5mm) pre-oxidize at 250°C for 40 minutes, cool down, then soak the pretreated metal foam in the above sol for 3 minutes, take it out, and use centrifugation to shake off the excess sol attached to the pores of the foam metal Dry, after natural drying for 30 minutes, keep it in a heating furnace ...

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Abstract

The present invention belongs to the field of chemistry and chemical engineering. The loaded photocatalytic filtering net is prepared with foamed metal sheet as carrier and through preoxidation of the foamed metal sheet, soaking the preoxidized foramed metal sheet in sol with tetrabutyl titanate or titanium trichloride precursor, drying and sintering. Carried TiO2 as active component accounts for 3.0-9.8% of total photocatalytic filtering net weight. The foamed metal of the present invention has stable chemical performance and high air penetration; and the loaded photocatalytic filtering net has great carrying amout, great specific surface area, high combination performance and high photocatalytic activity. When cooperating with ultraviolet ligh source, the loaded photocatalytic filtering net may be used to eliminate organic pollutant effectively.

Description

technical field [0001] The invention relates to a method for preparing a photocatalytic filter, in particular to a foam metal loaded TiO 2 A preparation method of a nano photocatalytic filter net. It belongs to the chemical industry field. Background technique [0002] Photocatalysis is an emerging technology for environmental purification. Nano-TiO 2 Photocatalysts can effectively oxidize or reduce harmful gas molecules adsorbed on their surfaces, kill bacteria, inhibit viruses, and convert harmful organic matter and bacteria into harmless substances such as water and carbon dioxide without any secondary pollution. Most of the existing photocatalysts are prepared from TiO 2 Nanopowder, due to TiO 2 The photocatalytic effect requires the TiO 2 The active components are fixed and require a certain light action area and reaction time, so increasing the TiO 2 High photocatalytic efficiency and the use of suitable photocatalytic carriers and loading methods are the key to...

Claims

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Application Information

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IPC IPC(8): B01D39/12B01J21/06B01J35/04B01J37/02
Inventor 上官文峰袁坚陈铭夏施建伟刘震炎
Owner SHANGHAI JIAO TONG UNIV
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