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Method for preparing visible light excited TiO2 photocatalyst utilizing industrial metatitanic acid

A photocatalyst, metatitanic acid technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as no practical application, and achieve large production capacity, simple preparation process, and powder agglomeration. small effect

Inactive Publication Date: 2008-06-18
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The patent reports described above have their own emphasis, but no practical solutions have been proposed for some key issues of using industrial metatitanic acid to prepare high-performance photocatalysts, such as the problem of agglomeration, the problem of dual-band excitation and response in ultraviolet and visible light, and how to achieve high efficiency. Catalysis etc.

Method used

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  • Method for preparing visible light excited TiO2 photocatalyst utilizing industrial metatitanic acid
  • Method for preparing visible light excited TiO2 photocatalyst utilizing industrial metatitanic acid
  • Method for preparing visible light excited TiO2 photocatalyst utilizing industrial metatitanic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add 480 grams of industrial metatitanic acid (non-pigment type produced) with a water content of about 50% and add 200 ml of water in a 1000 ml glass beaker to make a slurry, and add concentrated ammonia until the pH of the slurry is 8. Suction filter the slurry neutralized by adding alkali, wash it repeatedly with deionized water, and check the filtrate with 1g / L silver nitrate solution until there is no obvious white precipitate. At this time, it can be determined that sulfate ions are basically removed. Disperse the washed and purified metatitanic acid in 1 volume of industrial ethanol, vigorously stir and beat, and filter; the filter cake is washed repeatedly with absolute ethanol, and then placed in a vacuum drying oven at 70°C for distillation and dehydration.

[0054] Weigh 0.015 moles of lanthanum nitrate and 0.0015 moles of ytterbium nitrate and erbium nitrate and dissolve them in absolute ethanol, then add 0.0015 moles of chloroplatinic acid, after dissolving, ...

Embodiment 2

[0057]Add 685 grams of industrial metatitanic acid (pigment type) with a water content of about 65% and add 200 ml of water in a 1000 ml glass beaker to make a slurry, and add concentrated ammonia until the pH of the slurry is 9. Suction filter the slurry neutralized by adding alkali, wash it repeatedly with deionized water, and check the filtrate with 1g / L silver nitrate solution until there is no obvious white precipitate. At this time, it can be determined that sulfate ions are basically removed. Disperse the washed and purified metatitanic acid in 2 times the volume of industrial ethanol, stir vigorously, and filter; the filter cake is washed repeatedly with absolute ethanol, and then placed in a vacuum drying oven at 90°C for distillation and dehydration. Finally, about 240 grams of anhydrous metatitanic acid were prepared.

[0058] Weigh 0.075 moles of lanthanum nitrate and 0.0075 moles of ytterbium nitrate and praseodymium nitrate and dissolve them in absolute ethanol, ...

Embodiment 3

[0061] As in Example 1, take 480 grams of industrial metatitanic acid (non-pigment type produced) with a water content of about 50%, add 200 ml of water and stir in a 1000 ml glass beaker for beating, and add concentrated ammonia until the pH of the slurry is 8. Suction filter the slurry neutralized by adding alkali, wash it repeatedly with deionized water, and check the filtrate with 1g / L silver nitrate solution until there is no obvious white precipitate. At this time, it can be determined that sulfate ions are basically removed. Disperse the washed and purified metatitanic acid in 1.5 times the volume of industrial ethanol, stir vigorously, and filter; the filter cake is washed repeatedly with absolute ethanol, and then placed in a vacuum drying oven at 80°C for distillation and dehydration. 240 g of anhydrous metatitanic acid were prepared.

[0062] Weigh 0.15 moles of yttrium nitrate and 0.015 moles of ytterbium nitrate, holmium nitrate and thulium nitrate and dissolve th...

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Abstract

The present invention relates to a method for preparing visible light excitation TiO2 photocatalyst by utilizing industrial metatitanic acid, belonging to the field of nano material preparation technology. In particular, it relates to the preparation of titanium dioxide nano material. Said method includes the following steps: utilizing sulfuric acid method to produce intermediate raw material industrial metatitanic acid of titanium white powder, washing and purifying, solvent displacement and dehydration, adding rare earth element and noble metal element to obtain ultrafine raw material powder, then roasting, making heat treatment and doping so as to obtain the invented product.

Description

Technical field: [0001] Preparation of TiO Excited by Visible Light Using Industrial Metatitanic Acid 2 The photocatalyst method belongs to the technical field of nanometer material preparation, and in particular relates to the preparation of titanium dioxide nanometer material. Background technique: [0002] Photocatalysis refers to a photochemical reaction and redox process that occurs between photocatalysts and their surface adsorbates under the condition of light participation. Since its discovery in TiO in 1972 2 The research on heterogeneous photocatalysis has been in the ascendant since the photoelectric splitting phenomenon of water generated on electrodes. Focusing on broadening the spectral response of titanium dioxide, improving the photocatalytic quantum efficiency and reaction speed has always been the frontier topic of heterogeneous photocatalysis research. [0003] Titanium dioxide is a typical n-type semiconductor photocatalytic material. The band gap of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06
Inventor 凌云汉陈显彬梁祖权白新德
Owner TSINGHUA UNIV
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