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Method for preparing AgI/TiO2 nano compound photocatalyst

A photocatalyst and nano-composite technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low absorption coefficient, toxic dyes, self-degradation, etc., and achieve simple and economical preparation process The effect of stable energy and performance

Inactive Publication Date: 2008-12-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist: metal-doped TiO 2 Unstable, nonmetal-doped TiO 2 Low absorption coefficient in the visible region, dyes are toxic and self-degrading

Method used

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  • Method for preparing AgI/TiO2 nano compound photocatalyst
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  • Method for preparing AgI/TiO2 nano compound photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] AgI / TiO 2 The preparation method of nanocomposite photocatalyst, it comprises the steps:

[0022] Weigh 0.188g LiI.3H 2 O (lithium iodide trihydrate), add 4ml of absolute ethanol and ultrasonically dissolve to obtain A solution; weigh 0.169g AgNO 3 And add 15ml of absolute ethanol and sonicate until dissolved, thus preparing solution B. Add solution A dropwise to solution B under magnetic stirring to produce a yellow precipitate. After stirring evenly, add 1ml of butyl titanate dropwise, heat and stir until nearly dry, continue stirring for 1h after cooling until completely dry, then add 8ml of anhydrous Ultrasonic dissolution of ethanol, adding 1ml of water under magnetic stirring, Buchner funnel suction filtration, washing, baking at 90°C for 2h, roasting at 450°C for 2h, heating rate 10°C / min, and natural cooling to obtain AgI / TiO 2 Nanocomposite photocatalysts.

[0023] figure 1 , figure 2 Respectively, it is the TEM figure and the ultraviolet-visible light d...

Embodiment 2

[0040] AgI / TiO 2 The preparation method of nanocomposite photocatalyst, it comprises the steps:

[0041] 1) According to AgNO 3 The molar ratio to LiI is 1:1, and the following two raw materials are selected: (1) AgNO 3 , (2) LiI, standby;

[0042] 2) Add LiI into absolute ethanol and sonicate until dissolved to obtain A solution with a mass concentration of 1%;

[0043] AgNO 3 Add it into absolute ethanol and sonicate until dissolved to obtain a B solution with a mass concentration of 0.1%.

[0044] 3) Add solution A dropwise to solution B under magnetic stirring to produce a yellow precipitate. After stirring evenly, add butyl titanate dropwise; butyl titanate and AgNO 3 The mass ratio of is 5.9;

[0045] 4) Continue heating and stirring until nearly dry, continue stirring for 0.5h after cooling until completely dry, then add absolute ethanol to make the solid content in the resulting suspension to 5% (mass), ultrasonically disperse, add water under magnetic stirring, ...

Embodiment 3

[0047] AgI / TiO 2 The preparation method of nanocomposite photocatalyst, it comprises the steps:

[0048] 1) According to AgNO 3 with LiI.3H 2 The molar ratio of O is 1:1, and the following two raw materials are selected: (1) AgNO 3 , (2) LiI.3H 2 O, standby;

[0049] 2) LiI.3H 2 O was added to absolute ethanol and sonicated until dissolved to obtain a solution of A with a mass concentration of 10%;

[0050] AgNO 3 Add it into absolute ethanol and sonicate until dissolved to obtain a B solution with a mass concentration of 2%;

[0051] 3) Add solution A dropwise to solution B under magnetic stirring to produce a yellow precipitate. After stirring evenly, add butyl titanate dropwise; butyl titanate and AgNO 3 The mass ratio of is 61;

[0052] 4) Continue heating and stirring until nearly dry, continue stirring for 2 hours after cooling until completely dry, then add absolute ethanol to make the solid content of the resulting suspension 10%, ultrasonically disperse, add ...

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Abstract

The present invention relates to a preparation method of a nanometer-scale composite photocatalyst. The preparation method of AgI / TiO2 nanometer-scale composite photocatalyst is characterized by comprising the steps as follows: firstly, two raw materials of AgNO3 and LiI.3H2 or LiI are selected for using according to the mol ratio of 1 to 1 of the AgNO3 to the LiI.3H2 or the LiI; secondly, the LiI.3H2 or the LiI is added into waterless ethanol to be processed by ultrasound to be dissolved, solution A with weight concentration of 1 percent to 10 percent is obtained, the AgNO3 is added into the waterless ethanol to be processed by the ultrasound to be dissolved, solution B with the weight concentration of 0.1 percent to 2 percent is obtained; thirdly, when being stirred by magnetic force, the solution A is dripped into the solution B to be mixed uniformly, butyl titanate is dripped; fourthly, the waterless ethanol is added, water is added for washing and to be dried, calcined and cooled naturally to obtain the AgI / TiO2 nanometer-scale composite photocatalyst. The preparation method has easily obtained raw material and simple technology and is easy to be industrialized; the prepared AgI / TiO2 nanometer-scale composite photocatalyst has stable performance and good visible photocatalysis activity.

Description

technical field [0001] The invention relates to a preparation method of a visible light-responsive nanocomposite photocatalyst used for photocatalytic water treatment and air purification, and belongs to the field of nanomaterials and environmental purification. Background technique [0002] In the past 20 years, due to nano-TiO 2 It is cheap, non-toxic, and has the ability to efficiently degrade toxic gases and sewage, so it has been widely studied. Under the excitation of light, TiO 2 The valence band electrons of the photocatalyst are excited to its conduction band, photogenerated holes and electrons are generated in the valence band and conduction band respectively, and these photogenerated carriers migrate to TiO 2 The surface of the particles is captured by surface species (such as -OH, adsorbed water and oxygen, etc.), generating highly oxidizing and highly reactive active oxygen species such as hydroxyl radicals, and pollutants (mainly are organic pollutants) oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08B01J21/06C02F1/30A61L9/22
CPCY02W10/37
Inventor 李远志张华郭智敏赵修建韩建军
Owner WUHAN UNIV OF TECH
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