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Method for preparing porous titanium dioxide based on light assistance

A porous titanium dioxide and light-assisted technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of low yield and poor repeatability, and achieve the effects of small solvent pollution, large pore volume, and mild reaction conditions

Inactive Publication Date: 2010-06-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods introduce new synthetic means based on sol-gel chemistry, they have poor reproducibility and low yields

Method used

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  • Method for preparing porous titanium dioxide based on light assistance
  • Method for preparing porous titanium dioxide based on light assistance
  • Method for preparing porous titanium dioxide based on light assistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 5mL butyl titanate Ti(OC) to 50mL ethylene glycol solvent 4 h 9 ) 4 , after stirring for 30 minutes, the solution was transferred to a round-bottomed flask, refluxed at 160°C for 2 hours, and then naturally cooled to room temperature;

[0033] The above solution is separated by a centrifuge, and then washed repeatedly with absolute ethanol for 3 times to obtain titanium glycolate;

[0034] The resulting titanium glycolate solid was dried at room temperature to obtain titanium glycolate Ti(OCH 2 CH 2 O) 2 Precursor solid powder;

[0035] Weigh 4 grams of titanium glycolate precursor and disperse it in 400 mL of water, and then irradiate the solution with a 400-watt ultraviolet lamp for 2 hours under a nitrogen protective atmosphere to obtain a porous titanium dioxide material.

[0036] Some structural characterizations of the porous titania materials prepared by the above method were carried out. figure 1 Shown are the nitrogen adsorption-desorption isotherms ...

Embodiment 2

[0039] Add 5mL butyl titanate Ti(OC) to 50mL ethylene glycol solvent 4 h 9 ) 4 , after stirring for 30 minutes, the solution was transferred to a round-bottomed flask, refluxed at 160°C for 2 hours, and then naturally cooled to room temperature;

[0040] Using a centrifuge to separate the above solution, and then repeatedly washing it with absolute ethanol 3 times to obtain a metal alkoxide solid;

[0041] The obtained metal alkoxide solid is dried at room temperature to obtain titanium glycolate Ti(OCH 2 CH 2 O) 2 Precursor solid powder;

[0042]Weigh 4 grams of titanium glycolate precursor and disperse it in 400mL of water, and then irradiate the solution with a 400-watt UV lamp for 0.25 hours, 0.5 hours, 1.0 hours, 1.5 hours, and 2 hours under a nitrogen protective atmosphere. , sample 10mL at a given time and titrate with potassium dichromate to measure the number of electrons contained in the porous titanium dioxide material.

[0043] Figure 4 Shown is the curve ...

Embodiment 3

[0045] Add 5mL butyl titanate Ti(OC) to 50mL ethylene glycol solvent 4 h 9 ) 4 , after stirring for 30 minutes, the solution was transferred to a round-bottomed flask, refluxed at 160°C for 2 hours, and then naturally cooled to room temperature;

[0046] Use a centrifuge to separate the above solution, and then use absolute ethanol to wash repeatedly 3 times to obtain titanium glycolate;

[0047] The resulting titanium glycolate solid is dried at room temperature to obtain titanium glycolate Ti(OCH 2 CH 2 O) 2 Precursor solid powder;

[0048] Weigh 4 grams of titanium glycolate precursor and disperse it in 400 mL of water, and then irradiate the solution with a 400-watt ultraviolet lamp for 2 hours under a nitrogen protective atmosphere to obtain a porous titanium dioxide material containing electrons. Each gram of titanium dioxide sample contains 1.4 mmol of electrons.

[0049] Weigh 2 grams of the above-mentioned electron-containing titanium dioxide, and add it into 2...

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Abstract

The invention relates to a method for preparing porous titanium dioxide based on light assistance in the technical field of electromagnetic semiconductors, which prepares the porous titanium dioxide by irradiating aqueous solution of titanium glycol salt with ultraviolet light. The method for preparing the porous titanium dioxide is quick and controllable, has good repeatability, and is suitable for large-scale production. The prepared porous titanium dioxide has the characteristics of high specific area, large pore volume, uniform distribution of pore sizes and the like. More important, the porous titanium dioxide can efficiently convert light energy into stored electrons, and the stored electrons not only can provide an electron source for reduction reactions, but also can provide a spinning source to obtain new room temperature ferromagnetic semiconductors.

Description

technical field [0001] The invention relates to a method in the technical field of electromagnetic semiconductors, in particular to a preparation method based on light-assisted porous titanium dioxide. Background technique [0002] Titanium dioxide is a new type of photocatalyst. Under the irradiation of ultraviolet rays, it can decompose and remove various organic substances attached to the surface of titanium dioxide. It has important application value in the fields of environmental protection and health care. Porous titania material has a very large specific surface area and rich pore structure, which is a kind of high-efficiency catalyst with excellent properties, and it has attracted widespread attention. Recently, a variety of synthetic strategies have been used to prepare porous titania materials, these strategies are mainly based on sol-gel chemistry, and generally require the introduction of templating agents during the preparation process. Due to the very high rea...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 陈接胜邹晓新王开学李国栋
Owner SHANGHAI JIAO TONG UNIV
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