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Method for modifying photocatalyst TiO2 by using WO3 and rare earth metal element La

A technology of metal elements and catalysts, which is applied in the field of photocatalysis, can solve the problems that are difficult to meet the requirements of practical applications, the powders of composite materials are easy to agglomerate, and the preparation method is complicated, so as to promote charge separation and charge movement, low cost, and method The effect of simple process

Inactive Publication Date: 2014-09-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the preparation method of the above patent is complicated, the conditions are harsh, and the cost is high. The obtained composite material powder is easy to agglomerate, and it is difficult to meet the requirements of practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Add 60ml of absolute ethanol (analytical grade) into a beaker or Erlenmeyer flask, and place it on a magnetic stirrer for vigorous stirring.

[0045] 2) Slowly add 20ml of tetrabutyl titanate (analytical pure) into the solution described in step 1) through the funnel. After the dropping, add 4ml of glacial acetic acid (analytical pure) dropwise to form solution A. The whole dropping process last for 20min.

[0046] 3) Add 1ml HNO 3 and 2ml of deionized water were added to 20ml of absolute ethanol to form solution B. Slowly add solution B into solution A under vigorous stirring. The whole dropping process lasts for 15 minutes. The volume ratio of solution B to solution A is: 8:24; after dropping, continue to stir for 15 minutes.

[0047] 4) Slowly add a certain concentration of ammonium tungstate solution into the solution described in step 3), and control the rate of addition so that no white precipitate occurs. After dropping, add a certain concentration of lanth...

Embodiment 2

[0051] 1) Add 40ml of absolute ethanol (analytical grade) into a beaker or Erlenmeyer flask, and place it on a magnetic stirrer for vigorous stirring.

[0052] 2) Slowly add 15ml of tetrabutyl titanate (analytical pure) into the solution described in step 1) through the funnel, after the dropping, add 3ml of glacial acetic acid (analytical pure) dropwise to form solution A, the whole dropping process Last for 15min.

[0053] 3) Add 0.75ml HNO 3 and 1.5ml of deionized water were added to 15ml of absolute ethanol to form solution B. Solution B was slowly added dropwise into solution A under vigorous stirring, and the whole dropping process lasted for 20 min. The volume ratio of solution B to solution A is: 9:20; after dropping, continue to stir for 20 minutes.

[0054] 4) Slowly add a certain concentration of ammonium tungstate solution into the solution described in step 3), and control the rate of addition so that no white precipitate occurs. After dropping, add a certain ...

Embodiment 3

[0058] 1) Add 55ml of absolute ethanol (analytical grade) into a beaker or Erlenmeyer flask, and place it on a magnetic stirrer for vigorous stirring.

[0059] 2) Slowly add 18ml of tetrabutyl titanate (analytical pure) into the solution described in step 1) through the funnel, after dropping, add 3.5ml of glacial acetic acid (analytical pure) dropwise to form solution A, and add dropwise The process lasted 20 minutes.

[0060] 3) Add 1ml HNO 3 and 2ml of deionized water were added to 20ml of absolute ethanol to form solution B. Solution B was slowly added dropwise into solution A under vigorous stirring, and the whole dropping process lasted for 20 min. The volume ratio of solution B to solution A is: 1:3; after dropping, continue to stir for 15 minutes.

[0061] 4) Slowly add a certain concentration of ammonium tungstate solution into the solution described in step 3), and control the rate of addition so that no white precipitate occurs. After dropping, add a certain con...

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Abstract

The invention relates to a method for modifying a photocatalyst TiO2 by using WO3 and a rare earth metal element La. The method comprises the following steps: dispersing a precursor tetrabutyl titanate into a solvent absolute ethyl alcohol, performing a hydrolysis reaction to obtain nanometer TiO2 particles, and introducing a semiconductor material WO3 and a rare earth metal element La in a reaction process, wherein the mol ratio of the Ti:WO3:La is 100:(0-10):(1-6), and the WO3-La / TiO2 nanometer compound photocatalyst is uniform in size, better in dispersity, free from toxicity and secondary pollution, low in price of raw materials and stable in source, simple in synthesis process without secondary pollution, low in price and stable in source of raw materials, simple in synthesis process without pollution, excellent in performance, and wide in application range, can be repeatedly used, can be conveniently prepared into a powdery coating or other types of green environmental-friendly material, is applied to pollution removal and purification of various environments, and has a wide practical application value in the aspect of preparation of a photoelectric material or photocatalysis material.

Description

technical field [0001] The present invention relates to a method using WO 3 and rare earth metal element La on photocatalyst TiO 2 The modification method, the obtained photocatalyst can be used for the degradation of pollutants in the environment, and belongs to the technical field of photocatalysis. Background technique [0002] Titanium dioxide (TiO 2 ) As a traditional semiconductor photocatalyst, it has the advantages of high catalytic activity, strong oxidation ability, stable chemical properties, and low price. It has great potential in the fields of photocatalysis, air purification, sewage treatment, sterilization, solar cells and lithium batteries Broad application prospects. However, TiO as a photocatalyst 2 , its forbidden band width is relatively large (3.0-3.2eV), it can only absorb and utilize ultraviolet light with a wavelength less than 400nm, and the recombination rate of photogenerated electrons and holes is relatively high, which significantly reduces ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30
Inventor 王燕闫晗马德方韩绮高宝玉岳钦艳李倩
Owner SHANDONG UNIV
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