Nano-titanium dioxide doped with inorganic vanadium salt and palladium salt to regulate morphology and its preparation method and application
A nano-titanium dioxide, morphology technology, applied in the nano field, can solve the problems of irritating the eyes, skin and respiratory system, expensive price, etc., and achieve the effect of increasing reactive points, improving gas sensitivity, and easy bonding
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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 8.62mgNa 3 VO 4 and 17.5mgPd(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 di...
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 10.34mgNa 3 VO 4 and 19.98mgPd(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 a...
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