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Preparation method of highly active titanium dioxide membrane photocatalyst

A technology of photocatalyst and titanium dioxide, which is applied in the field of water treatment technology and air treatment, can solve the problems of shortened service life and low photocatalytic activity, and achieve the effects of strong controllability, high photocatalytic activity and high photocatalytic activity

Inactive Publication Date: 2006-09-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of low photocatalytic activity and severely shortened service life of thin-film photocatalysts under conditions of long-term immersion in humid environments or water bodies, and provide a method that can maintain high catalytic activity for a long time under water immersion or certain humidity conditions. Improve the economy and practicability of related photocatalytic technology and equipment

Method used

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  • Preparation method of highly active titanium dioxide membrane photocatalyst
  • Preparation method of highly active titanium dioxide membrane photocatalyst
  • Preparation method of highly active titanium dioxide membrane photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Preparation of thin film photocatalyst on titanium sheet by dipping and pulling method

[0033] 1) Loading substrate material treatment: commercially pure titanium is immersed in boiling Na with pH=9.5 2 CO 3 Keep it in the solution for 30 minutes, carry out thorough degreasing treatment and rinse, and then immerse in boiling 10% oxalic acid aqueous solution, keep it for 1 hour, and carry out activation treatment. When the surface of the base material presents a uniform dark gray pitted surface and the metallic luster disappears completely, the base material can be taken out, rinsed and dried, and can be used as a base material for supporting titanium dioxide thin film photocatalysts.

[0034] The effect of oxalic acid in the present invention:

[0035] a) Oxalic acid, as a drying control chemical additive, plays a role in suppressing cracks during the film formation process (no penetrating long cracks appear on the surface of the film), so that the surface...

Embodiment 2

[0043] Embodiment 2: Prepare thin film photocatalyst on aluminum sheet by spraying method

[0044] 1) Loading base material treatment: 0.5mm-thick sheet-shaped industrial pure aluminum is immersed in boiling detergent solution with pH=9 for 30 minutes, thoroughly degreased, taken out and rinsed, and then immersed in boiling 1 % oxalic acid aqueous solution, keep 1h, carry out activation treatment. When the metallic luster on the surface of the base material disappears completely and becomes uniform off-white, the base material can be taken out, rinsed and dried, and can be used as a base material for supporting titanium dioxide thin film photocatalysts.

[0045] 2) Coating sol preparation: Add 5ml of isopropyl titanate and 2ml of acetylacetone in sequence to 70ml of ethylene glycol, stir and mix well, then slowly drop in 2ml of deionized water, and then fully disperse with ultrasonic waves for 20min, then Then add 0.1 g of oxalic acid, stir quickly to dissolve the oxalic acid...

Embodiment 3

[0049] Example 3: Preparation of thin film photocatalyst on nickel foam by dipping and pulling method

[0050] 1) Loaded base material treatment: the pore size is 30 mesh nickel foam loaded base material immersed in the boiling NaHCO of pH=9.5 3 Keep in the solution for 60 minutes, carry out thorough degreasing treatment and rinse, and then immerse in 20% oxalic acid aqueous solution at a temperature of 50°C, keep for 2.5 hours, and perform activation treatment. When the metallic luster on the surface of the base material disappears completely, and the base material becomes uniform gray-black, the base material can be taken out, rinsed, dried, and used as a base material for supporting titanium dioxide thin film photocatalysts.

[0051] 2) Coating sol preparation: Add 15ml tetrabutyl titanate and 8ml acetylacetone in sequence to 80ml glycerol, stir and mix well, then slowly drop in 7ml deionized water, then fully disperse with ultrasonic waves for 20min, and then add 5.55g of...

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Abstract

The invention relates to a kind of titanium dioxide film photocatalyst with high activity, which belongs to photoactivate technique. The aim of the invention is to improve the stability of the film photocatalyst, to offer a photocatalyst manufacturing method that can hold high activity in the condition of water soaking or certain temperature, and also to improve the economy and the practicability. The manufacturing method of the invention mentioned contains the steps as follows: firstly, make the loading outsole material have pre-treatment; then manufacture coating collosol by the modification of oxalic acid; after the coating collosol mentioned above having the ultrasonic dispersion by 10-20 min, manufacture a streak of film with the even thickness in the pre-treatment outsole material and then make it have anhydration; finally, after putting film into the heater treater, when the temperature rises from the room temperature to any temperature between 350-550 centigrade, sinter it with more than 20 min; after the boiler chilling to the room temperature, the titanium dioxide film photocatalyst with high activity can be acquired.

Description

technical field [0001] The invention relates to a photocatalyst preparation technology that can maintain high catalytic activity for a long time in the gas phase and liquid phase environment. It can be applied to degrade toxic and harmful pollutants in air and water. It belongs to photocatalysis technology and also belongs to water treatment technology and air treatment. technology field. Background technique [0002] Based on nano-titanium dioxide (TiO 2 ) photocatalytic technology originated in the 1970s and has been widely used in recent years. The most striking advantage of this technology in the field of environmental purification is that as long as the photocatalyst is excited by light of appropriate intensity and wavelength, it is enough to oxidize and degrade almost all organic pollutants and mineralize them. [0003] At present, people all over the world are paying more and more attention to the pollution of air and water caused by various toxic and harmful organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J37/02
Inventor 张丽张彭义余刚祝万鹏
Owner TSINGHUA UNIV
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