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Zinc titanite photocatalyst, preparation method and use thereof

A technology of photocatalyst and zinc titanate, which is applied in the field of photocatalysis, can solve the problems of ignoring the catalytic performance and achieve the effects of good powder dispersion, wide application range and high catalytic efficiency

Inactive Publication Date: 2009-01-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Zinc titanate, as a composite oxide, is widely used in the production of low dielectric constant temperature coefficient ceramic capacitors and medium and high voltage capacitors, but its catalytic performance has been neglected for a long time.

Method used

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  • Zinc titanite photocatalyst, preparation method and use thereof
  • Zinc titanite photocatalyst, preparation method and use thereof
  • Zinc titanite photocatalyst, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put 3.00 g of butyl titanate in a beaker, and slowly add an appropriate amount of ethanol while stirring to form a 0.5 mol / L titanium source solution; dissolve 1.62 g of zinc acetate in an appropriate amount of ethylene glycol to form a 0.1 mol / L solution. Then mix the above two solutions, add 0.74ml of acetylacetone and 0.98g of PVP, continue stirring for 1 hour, and then age in the air for 24 hours. After stirring for 0.5 hour, it was heated to 180°C and reacted for 1 hour to form a white turbid liquid. After ultrasonic washing with acetone (5 times the volume ratio of ethylene glycol) and then washing with ethanol 3 times, centrifugal separation, and drying at 110°C to obtain precursor powder. After annealing at 800°C for 3 hours, a white pure hexagonal zinc titanate powder was obtained.

Embodiment 2

[0030] Put 4.00 g of butyl titanate in a beaker, and slowly add an appropriate amount of ethanol while stirring to form a 0.5 mol / L titanium source solution; dissolve 2.24 g of zinc nitrate in an appropriate amount of ethylene glycol to form a 0.1 mol / L solution. Then mix the above two solutions, add 1.82ml of acetylacetone and 2.15g of CTAB, continue to stir for 2 hours, and then age in the air for 24 hours. After stirring for 1 hour, heating to 170°C and reacting for 1 hour resulted in a white turbid liquid. After centrifugal separation, drying at 140°C, and direct annealing at 800°C for 2 hours, a white zinc titanate powder with a hexagonal and cubic mixed phase was obtained.

Embodiment 3

[0032] Place 2.23 g of titanium tetrachloride in a beaker, and slowly add an appropriate amount of ethanol while stirring to form a 0.5 mol / L titanium source solution; dissolve 2.24 g of zinc nitrate in an appropriate amount of ethylene glycol to form a 0.2 mol / L solution. Then mix the above two solutions, add 0.80ml of acetylacetone and 2.62g of PVP, continue to stir for 2 hours, then age in the air for 12 hours. After stirring for 1 hour, heating to 160°C and reacting for 2 hours resulted in a white turbid liquid. After ultrasonic washing with acetone (volume ratio 10 times that of ethylene glycol) and washing with ethanol 5 times, centrifugal separation, drying at 140°C, direct annealing at 800°C for 2 hours, white hexagonal and cubic mixed phase titanium Acid zinc powder.

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Abstract

The invention discloses a zinc titanite photocatalyst, as well as the preparation method and the application thereof. The preparation method of the zinc titanite photocatalyst comprises the following steps: firstly, a titanium source and dissolvable zinc salt are respectively dissolved in ethanol and ethylene glycol; then the two solutions are mixed; a bit of acetylacetone and surface active agent are added during the stirring process; and the reaction system is well mixed after 0.5-2 hours of stirring. The solution stands by in the air, and then reacts after 12-24 hours of aging; the reaction temperature is 160-190 DEG C; the reaction time lasts for 60-120 minutes; and then a white turbid solution is obtained. The reaction product is obtained by adopting the centrifugal separation technology; acetone is firstly used for ultrasonic cleaning; and then the reaction product is dried under 110-170 DEG C after ethanol is used for washing by 3-5 times, thereby a precursor powder can be obtained. Finally, the precursor powder or the reaction product obtained by the centrifugal separation is annealed at 600-900 DEG C for 2-4 hours, so as to obtain a white zinc titanite powder sample. The yield can be more than 80 percent, and the specific surface area is about 10-15 m<2> / g.

Description

Technical field: [0001] The invention relates to a catalyst, in particular to a zinc titanate photocatalyst, and a preparation method and application of the catalyst. The invention is suitable for the photolysis and purification treatment of organic pollutants in water, and belongs to the technical field of photocatalysis. Background technique: [0002] In the field of environmental pollution control, semiconductor photocatalytic oxides can degrade and remove toxic and harmful chemical pollutants in waste gas and wastewater from the environment, and have great application prospects in the treatment of industrial organic wastewater. At present, most of the photocatalysts used in the field of photocatalysis are n-type semiconductor oxides, such as ZnO, TiO 2 , Fe 2 O 3 and many more. Of which ZnO, TiO 2 Because of its stable nature, safety, non-toxicity, and low price, it has attracted much attention and has a broad market. [0003] As the most widely existing energy source in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06C02F1/30A62D3/17
CPCY02W10/37
Inventor 孔继周李爱东吴迪闵乃本
Owner NANJING UNIV