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Morphological-control nano titanium dioxide doped with inorganic vanadate and palladium salt as well as preparation method and application of morphological-control nano titanium dioxide

A nano-titanium dioxide and titanium dioxide technology, applied in the nanometer field, can solve the problems of irritating the eyes, skin and respiratory system, and the price is too expensive, and achieve the effect of increasing the reactive point, improving the gas sensitivity and increasing the contact surface

Inactive Publication Date: 2015-07-01
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This invention uses organic titanium alkoxide vanadyl triisopropoxide as the vanadium source, and the organic van

Method used

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  • Morphological-control nano titanium dioxide doped with inorganic vanadate and palladium salt as well as preparation method and application of morphological-control nano titanium dioxide
  • Morphological-control nano titanium dioxide doped with inorganic vanadate and palladium salt as well as preparation method and application of morphological-control nano titanium dioxide
  • Morphological-control nano titanium dioxide doped with inorganic vanadate and palladium salt as well as preparation method and application of morphological-control nano titanium dioxide

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Experimental program
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Effect test

Embodiment 1

[0037] The preparation of the nano titanium dioxide of embodiment 1, vanadium, palladium co-doping, steps are as follows:

[0038] (1) Measure 0.6 mL of tetrabutyl titanate and add it dropwise to 25 mL of ethanol solution, and stir at room temperature for 20 min to obtain a sol;

[0039] (2) Weigh 8.62mg Na 3 VO 4 and 17.5mg Pd(NO 3 ) 2 2H 2 O was dissolved in 50 mL of twice distilled water, dropped into the above sol, and stirred at room temperature for 20 min;

[0040] (3) Place the sol mixture prepared in step (2) in a water bath at 30° C., heat-treat the sol, and slowly evaporate the solvent to obtain a gel;

[0041] (4) After grinding the gel prepared in step (3), calcining at 450° C. for 2 hours to obtain vanadium and palladium co-doped nano-titanium dioxide powder.

[0042] The prepared nano-titanium dioxide is anatase type, presenting two kinds of morphology at the same time. Nano-titanium dioxide particles have a particle size of ~25nm, and rod-shaped titanium ...

Embodiment 2

[0043] Embodiment 2, application of vanadium, palladium co-doped nano-titanium dioxide gas-sensing material

[0044] Take 5 mg of vanadium and palladium co-doped nano-titanium dioxide powder prepared in Example 1, grind it finely, add a small amount of terpineol to make a paste, apply it evenly on the alumina ceramic tube, and place it in a muffle furnace at 300 °C Internally sintered for 2 hours to make a tube core, and welded and packaged according to the conventional process of side-heated devices to obtain gas-sensitive sensor devices (such as Figure 4 shown). After 120 hours of electrical aging, the properties of the gas sensor were measured with a HW-30A gas sensor tester.

[0045] At an operating temperature of 160°C, the gas-sensing properties of 100ppm chlorobenzene were tested. From the response-recovery curve of the gas sensor to 100ppm chlorobenzene, such as image 3 As shown, it can be seen that the response and recovery time of chlorobenzene are 10s and 21s res...

Embodiment 3

[0070] The preparation of the nano-titanium dioxide of embodiment 3, vanadium, palladium co-doping, steps are as follows:

[0071] (1) Measure 0.6 mL of tetrabutyl titanate and add it dropwise to 25 mL of ethanol solution, and stir at room temperature for 25 min to obtain a sol;

[0072] (2) Weigh 10.34mg Na 3 VO 4 and 19.98mg Pd(NO 3 ) 2 2H 2 O was dissolved in 50 mL of twice distilled water, dropped into the above sol, and stirred at room temperature for 25 min;

[0073] (3) Place the sol mixture prepared in step (2) in a water bath at 35° C., heat-treat the sol, and slowly evaporate the solvent to obtain a gel;

[0074] (4) After grinding the gel prepared in step (3), calcining at 480° C. for 1.5 h to obtain vanadium and palladium co-doped nano titanium dioxide powder.

[0075] The prepared nano-titanium dioxide is anatase type, showing two shapes at the same time, nano-titanium dioxide particles with a particle size of about 30nm, and rod-shaped titanium dioxide with...

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Abstract

The invention relates to a morphological-control nano titanium dioxide doped with inorganic vanadate and palladium salt as well as a preparation method and an application of the morphological-control nano titanium dioxide. The nano titanium dioxide presents two morphologies simultaneously, namely nano titanium dioxide particles and rod-shaped nano titanium dioxide with a square section. The preparation method comprises the following steps: dropwise adding tetrabutyl titanate into an alcohol solution to stir to obtain sol; dissolving sodium orthovanadate and palladium nitrate in water to obtain a mixture, dropwise adding the mixture into the sol to stir, heating the obtained sol mixed liquor in water bath at 30-40 DEG C to volatilize a solvent to obtain gel; grinding the prepared gel and roasting at 450-480 DEG C to obtain special-morphology nano titanium dioxide powder co-doped with vanadium and palladium. The morphological-control nano titanium dioxide doped with inorganic vanadate and palladium salt is used for manufacturing a gas-sensitive sensor for chlorobenzene detection, and the gas-sensitive sensor is high in sensitivity, and short in chlorobenzene response and recovery time.

Description

technical field [0001] The invention relates to nano-titanium dioxide doped with inorganic vanadium salt and palladium salt to control the morphology, a preparation method and application thereof, and belongs to the field of nanotechnology. Background technique [0002] With the continuous expansion of industrial scale, many harmful gases are produced in the production process, which has caused great harm to the environment and human health, so the timely detection of pollutants is particularly important. Gas sensors made of nanomaterials have the advantages of simple fabrication, low price, and sensitive detection, and have attracted widespread attention. [0003] Chlorobenzene has long been recognized as a persistent organic pollutant by international organizations, but there are relatively few gas-sensitivity tests for chlorobenzene. The applicant's patent (ZL 200710114004.2) in 2009 provides a nano-zinc oxide multifunctional gas sensor device and its manufacturing metho...

Claims

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Application Information

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IPC IPC(8): G01N33/00C01G23/053B82Y30/00
Inventor 景志红丰奇由绪岩
Owner QUFU NORMAL UNIV
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