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Nanometer titania photocatalyst for degrading VOC and preparation method of nanometer titania photocatalyst for degrading VOC

A nano-titanium dioxide and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of complex preparation process and low concentration of benzene degradation, and achieve simple process operation, low cost, Ease of promoting the effect of the application

Inactive Publication Date: 2014-12-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This solves the problem of complex preparation process of nano-titanium dioxide photocatalyst and low concentration of benzene degradation

Method used

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  • Nanometer titania photocatalyst for degrading VOC and preparation method of nanometer titania photocatalyst for degrading VOC
  • Nanometer titania photocatalyst for degrading VOC and preparation method of nanometer titania photocatalyst for degrading VOC
  • Nanometer titania photocatalyst for degrading VOC and preparation method of nanometer titania photocatalyst for degrading VOC

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] S1: Place the sample, in which the nano-sized titanium dioxide prepared by the hydrothermal method is first put into the tube furnace to spread as much as possible on the ark where the sample is placed, and the thickness does not exceed 0.1 cm. The model of the tube furnace is tube OTF-1200X, with a maximum power of 2.5KW. The particle size of the nano titanium dioxide is 10 nm, and the nano titanium dioxide is prepared by hydrothermally using tetrabutyl titanate as a precursor at 160° C. for 12 hours. Blow in ammonia gas with a purity of 99.9% for 30 minutes, and the flow rate of ammonia gas is 100mL / min, at this time all the air in the tube furnace is discharged;

[0032] S2: Atmospheric calcination, in which the heating program of the tube furnace is set first, and the furnace body is raised to 550°C at a heating rate of 4°C / min and kept for 2 hours. The process is continuously fed with ammonia gas, and the flow rate of ammonia gas is 100mL / min;

[0033] S3: Vacuum cal...

Embodiment 2

[0036] The steps in this embodiment are the same as those in embodiment 1, except that:

[0037] In S1, the particle size of nano titanium dioxide is 13 nm, and ammonia gas with a purity of 99.99% is introduced.

[0038] In S2, the heating rate of the tube furnace is 6°C / min, the furnace body is heated to 600°C and kept for 4 hours, and the flow rate of ammonia gas is 200mL / min;

[0039] In S3, the vacuum degree of heat preservation is 50KPa, the heat preservation time is 3 hours, the heat preservation temperature is 600℃, and the flow rate of ammonia gas is 200mL / min;

[0040] In S4, the vacuum degree is maintained at 50KPa, and the sample is taken out to obtain the nano titanium dioxide photocatalyst.

Embodiment 3

[0042] The steps in this embodiment are the same as those in embodiment 1, except that:

[0043] In S1, the particle size of nano titanium dioxide is 15 nm, and ammonia gas with a purity of 99.999% is introduced.

[0044] In S2, the heating rate of the tube furnace is 7°C / min, the furnace body is heated to 650°C and kept for 3 hours, and the flow rate of ammonia gas is 350mL / min;

[0045] In S3, the vacuum degree of heat preservation is 20KPa, the heat preservation time is 4 hours, the heat preservation temperature is 650℃, and the flow rate of ammonia gas is 350mL / min;

[0046] In S4, the vacuum degree is maintained at 20Kpa, and the sample is taken out to obtain the nanometer titanium dioxide photocatalyst.

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Abstract

The invention discloses a preparation method of a nanometer titania photocatalyst for degrading VOC. The method comprises the following steps: S1, putting nanometer titania powder into a tube furnace, and then introducing ammonia gas of which the purity is not lower than 99.9%; S2, heating up the furnace body to 550-750 DEG C at the heating rate of 4 DEG C / min to 10 DEG C / min, and carrying out heat preservation, wherein the ammonia gas is lastingly introduced in the process S2; S3, carrying out vacuum calcination under the condition that the air pressure is lower than the barometric pressure in the tube furnace, wherein the heat preservation temperature in the S3 is the same as that in the S2; and S4, cooling and taking out a sample. The nanometer titania photocatalyst prepared by adopting the method disclosed by the invention has the relatively strong visible light absorption ability and relatively low electron-cavity recombination rate, high-concentration benzene pollutants can be quickly and completely degraded, and 5.256*10<-3>mg of benzene contained in a space of 0.002m<3> can be completely degraded only by consuming 0.1g of mass energy within four hours under visible light irradiation.

Description

Technical field [0001] The invention belongs to the technical field of material science and environmental engineering, and more specifically, relates to a nano titanium dioxide photocatalyst for degrading VOC and a preparation method thereof. Background technique [0002] As a kind of photocatalyst, titanium dioxide can excite electrons in the valence band to the conduction band under light and form holes in the valence band. The process of photocatalysis is to use the reductive properties of electrons and the oxidizing properties of holes to activate the oxygen or water molecules adsorbed on the surface of titanium dioxide. These active substances or electron holes directly react with pollutants to crack the pollutants to generate carbon dioxide and carbon dioxide. Water thus achieves the purpose of degrading pollutants to purify air and water bodies. Among them, nano-titanium dioxide has excellent physical and chemical properties and is cheap and easy to obtain. It is widely u...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J35/08B01D53/86B01D53/72
Inventor 宋武林曾磊李明辉曾大文谢长生
Owner HUAZHONG UNIV OF SCI & TECH
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