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Method for preparing V-S co-doped titanium dioxide photocatalyst

A technology of titanium dioxide and photocatalyst is applied in the field of preparation of titanium dioxide photocatalyst to achieve the effects of convenient operation, excellent photocatalytic performance and simple process

Inactive Publication Date: 2010-10-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Anatase phase bulk TiO 2 The band gap is about 3.2eV, it can only respond to light with a wavelength less than 387nm, but because the energy of light less than this wavelength in sunlight is very small, about 3 to 4%, 40% of the energy is concentrated in the visible light region, How to use visible light to become TiO 2 An important obstacle to practicality

Method used

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Effect test

Embodiment 1

[0017] 1) Using butyl titanate and vanadyl sulfate as precursors, wherein the molar fraction of vanadyl sulfate in the total precursor is 10%, dissolving and mixing the precursors in ethanol to obtain solution A;

[0018] 2) mixing water and ethanol according to a molar ratio of 200:3, and adjusting the pH value to 1 with nitric acid to obtain an aqueous ethanol solution;

[0019] 3) adding solution A dropwise to ethanol aqueous solution to carry out hydrolysis reaction, wherein the molar ratio of butyl titanate and vanadyl sulfate to water is 1:400, after the reaction is completed, aging for 72 hours to obtain titanium dioxide sol;

[0020] 4) Drying the titania sol under an infrared lamp to obtain V, S co-doped titania photocatalyst powder with a grain size of about 4 nm.

Embodiment 2

[0026] 1) Using butyl titanate and vanadyl sulfate as precursors, wherein the molar fraction of vanadyl sulfate in the total precursor is 15%, dissolving and mixing the precursors in ethanol to obtain solution A;

[0027] 2) mixing water and ethanol according to a molar ratio of 400:3, and adjusting the pH value to 5 with nitric acid to obtain an aqueous ethanol solution;

[0028] 3) The solution A was added dropwise into the aqueous ethanol solution for hydrolysis reaction, wherein the molar ratio of butyl titanate and vanadyl sulfate to water was 1:40, after the reaction was completed, it was aged for 48 hours to obtain a titanium dioxide sol.

[0029] 4) Drying the titania sol under an infrared lamp to obtain V, S co-doped titania photocatalyst powder with a grain size of about 4 nm.

[0030] The photodegradation rate of 15% V, S co-doped titanium dioxide photocatalyst to methyl orange is about 70% under visible light irradiation for 4h.

Embodiment 3

[0032] 1) Using butyl titanate and vanadyl sulfate as precursors, wherein the molar fraction of vanadyl sulfate accounts for 20% of the total precursors, dissolving and mixing the precursors in ethanol to obtain solution A.

[0033] 2) mixing water and ethanol according to a molar ratio of 20:3, adjusting the pH value to 7 with nitric acid to obtain an aqueous ethanol solution;

[0034] 3) Solution A was added dropwise into ethanol aqueous solution for hydrolysis reaction, wherein the molar ratio of butyl titanate and vanadyl sulfate to water was 1:800, after the reaction was completed, it was aged for 60 hours to obtain titanium dioxide sol.

[0035] 4) Drying the titanium dioxide sol under an infrared lamp to obtain V, S co-doped titanium dioxide photocatalyst powder with a grain size of about 4 nm.

[0036] The photodegradation rate of methyl orange by 20% V, S co-doped titanium dioxide photocatalyst is about 50% under visible light irradiation for 4h.

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Abstract

The invention discloses a method for preparing a V-S co-doped titanium dioxide photocatalyst, which adopts a sol-gel method and comprises the following steps: 1), dissolving and mixing tetrabutyl orthotita and vanadylsulfate, which are precursors, in ethanol to obtain solution A; 2), mixing water and ethanol to obtain aqueous solution of ethanol; 3), adding the solution A into the aqueous solution of ethanol to perform a hydrolysis reaction, aging the product of the hydrolysis reaction to obtain titanium dioxide sol; and 4), drying the titanium dioxide sol under an infrared lamp. In the invention, a special device and a high temperature condition are not required, the preparation method is simple and low in cost and makes the realization of industrial production easily, and the prepared V-S co-doped titanium dioxide photocatalyst has high V-S co-doped titanium dioxide photocatalytic performance.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide photocatalyst, in particular to a method for preparing a V, S co-doped titanium dioxide photocatalyst by using a sol-gel method. Background technique [0002] TiO 2 It is an important wide-bandgap semiconductor material, which has attracted widespread attention because of its unique electrical, optical, and photochemical properties. Anatase phase bulk TiO 2 The band gap is about 3.2eV, it can only respond to light with a wavelength less than 387nm, but because the energy of light less than this wavelength in sunlight is very small, about 3 to 4%, 40% of the energy is concentrated in the visible light region, How to use visible light to become TiO 2 An important obstacle to practicality. [0003] Doping is an important method to change the properties of semiconductors, Asahi R, Morikawa T et al. in N-doped TiO 2 An important breakthrough has been made, triggering a round of TiO 2 ...

Claims

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Application Information

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IPC IPC(8): B01J27/02B01J21/06B01J23/22
Inventor 赵高凌何凯张俊娟陈志君韩高荣
Owner ZHEJIANG UNIV
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