Nanoporous alkali metal/alkaline earth metal titanate photocatalyst and preparation method thereof

A technology of alkaline earth metals and photocatalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low material efficiency, high energy consumption, high production costs, etc. problems, to achieve the effect of strong controllability, low energy consumption and low cost

Inactive Publication Date: 2016-01-13
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a nanoporous alkali metal / alkaline earth metal titanate photocatalyst and its preparation method, which solves the problem of large energy consumption and high production cost in the photocatalyst synthesis process in the prior art, The problem of low material efficiency

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  • Nanoporous alkali metal/alkaline earth metal titanate photocatalyst and preparation method thereof
  • Nanoporous alkali metal/alkaline earth metal titanate photocatalyst and preparation method thereof
  • Nanoporous alkali metal/alkaline earth metal titanate photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Nanotemplate-assisted preparation of nanoporous strontium titanate (SrTiO) with continuously tuned specific surface area and crystallinity3 ):

[0026] Weigh tetra-n-butoxytitanium (titaniumtetra-n-butoxide) and strontium acetate hemihydrate (strontium acetate hemihydrate) according to the stoichiometric ratio and dissolve them in absolute ethanol and glacial acetic acid respectively to prepare a clear solution, and then slowly mix the two solutions. By SrTiO 3 0, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% mass ratio of theoretical weight by adding SiO 2 Nano-template (template size is 10-20 nanometers), sonicate for 30 minutes to disperse the nano-template evenly. Then place the suspension on a heating and stirring table for heating and stirring (temperature: 70 degrees Celsius; stirring speed: 60 rpm), and dry gel can be obtained after 8 hours. Grind the dry gel evenly, then disperse it in distilled water, sonicate for 1 minute, and then add NaOH to make the soluti...

Embodiment 2

[0038] Size Tuning of Nanoporous SrTiO Using Nanotemplates 3 The hole size:

[0039] Weigh tetra-n-butoxytitanium (titaniumtetra-n-butoxide) and strontium acetate hemihydrate (strontium acetate hemihydrate) according to the stoichiometric ratio and dissolve them in absolute ethanol and glacial acetic acid respectively to prepare a clear solution, and then slowly mix the two solutions. By SrTiO 3 Add three types of Al to 30% mass ratio of theoretical output weight 2 o 3 Nano-templates (template sizes are 3-8 nm, 10-20 nm and 50-70 nm), ultrasonic for 30 minutes to disperse the nano-templates evenly. Then place the suspension on a heating and stirring table for heating and stirring (temperature: 70 degrees Celsius; stirring speed: 60 rpm), and dry gel can be obtained after 8 hours. Grind the dry gel evenly, then disperse it in distilled water, sonicate for 1 minute, and then add KOH to make the solution alkalinity reach 2 mol / L. Transfer the suspension to the polytetrafluor...

Embodiment 3

[0041] Preparation of nanoporous doped strontium titanate:

[0042] To prepare chromium-doped strontium titanate Sr 0.95 Cr 0.05 TiO 3 Co-doped strontium titanate Sr with lanthanum and chromium 0.95 La 0.05 Ti 0.95 Cr 0.05 o 3 as an example. Weigh tetra-n-butoxytitanium (titaniumtetra-n-butoxide) and hydrated strontium acetate hemihydrate (strontiumacetatehemihydrate) according to the stoichiometric ratio and dissolve them in absolute ethanol and glacial acetic acid respectively to prepare a clear solution, then slowly mix the two solutions, and then Prepared Cr(NO 3 ) 3 and La(NO 3 ) 3 The ethylene glycol solution is added according to the doping amount and stirred evenly. Press Sr 0.95 Cr 0.05 TiO 3 and Sr 0.95 La 0.05 Ti 0.95 Cr 0.05 o 3 Add SiO to 40% mass ratio of theoretical output weight 2 Nano-template (template size is 10-20 nm), sonicate for 30 minutes to disperse the nano-template evenly. Then place the suspension on a heating and stirring tabl...

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Abstract

The invention discloses a nanoporous alkali metal / alkaline-earth metal titanate photocatalyst and a preparation method thereof. A dual-function nanometer template with a sol-gel hydrothermal method is adopted, namely a novel preparation method of adding a normal inorganic template in a sol-gel process and removing the added template through a hydrothermal alkaline environment is used for preparing the nanoporous alkali metal / alkaline-earth metal titanate photocatalyst. The synthetic process has the characteristics of low energy consumption, short period, low cost and nearly no pollution in a synthetic process; the preparation materials have strong regulation possibility; parameters in three aspects of a specific surface area, a crystallinity and a duct size can be adjusted in large scale. The nanoporous alkali metal / alkaline-earth metal titanate photocatalyst prepared by using the dual-function nanometer template with the sol-gel hydrothermal method has the characteristics that the specific surface area and the crystallinity can be continuously regulated; the duct size is adjustable; organic pigments in organic gas pollutants and water solutions can be efficiently degraded; furthermore, photocatalysis decomposition and photo-reduction of carbon dioxide can be effectively carried out on water.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, in particular to a titanate photocatalyst and a preparation method thereof. Background technique [0002] Since the 20th century, the take-off of large-scale industrial production has led to the rapid development of the economy and the rapid improvement of human living standards, but it has also led to the deterioration of the earth's ecological environment. In the 21st century, the environmental crisis has become a topic of general concern to governments of all countries. Environmental purification and new energy development, energy efficient utilization and conservation have received equal attention, and have been raised to a strategic height related to the survival and development of the country. Therefore, this Research and technology development related to this aspect have attracted much attention. [0003] The use of photocatalytic technology to purify the environment is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/02B01J23/26B01J23/04B01J23/42B01J35/10C01G23/00B01D53/86B01D53/72C02F1/30C01B3/04C07C9/04C07C1/02
CPCY02E60/36
Inventor 欧阳述昕叶金花仝华许华王德法任健
Owner TIANJIN UNIV
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