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Method for preparing silicon-oxide-supported bismuth titanate photocatalyst

A technology of photocatalyst and silicon oxide, which is applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., to achieve good permeability and overcome severe agglomeration

Inactive Publication Date: 2014-04-30
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few reports on the research on silica-supported bismuth titanate. This patent discloses a method for preparing a novel silica-supported bismuth titanate photocatalyst by using a sol-gel method.

Method used

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Examples

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Embodiment 1

[0020] A method for preparing silicon oxide supported bismuth titanate photocatalyst, comprising the following process steps:

[0021] (1) Precursor preparation

[0022] Add 0.85 mL of tetrabutyl titanate dropwise into 8 mL of absolute ethanol, and stir evenly for 30 min to prepare liquid A. Weigh 1.6175 g of bismuth nitrate and dissolve it in 8 mL of distilled water. After it is completely dissolved, add 8 mL of glacial acetic acid and transfer to a water bath at 40°C until the milky white solution becomes clear to prepare liquid B.

[0023] (2) Gel and Calcination

[0024] Add solution A to solution B dropwise under vigorous stirring, add 2 mL of ethylene glycol (analytical grade) to the mixture, then add 1 g of silicon oxide, and place it in a water bath at 70 °C for 90 min to form a light yellow sol. Dry the sol in an oven at 90°C for 2 hours, then treat it at 110°C for 12-16 hours until the sample is dry, grind it and place it in a muffle furnace for calcination at 700°...

Embodiment 2

[0026] A method for preparing silicon oxide supported bismuth titanate photocatalyst, comprising the following process steps:

[0027] (1) Precursor preparation

[0028] Add 0.85 mL of tetrabutyl titanate dropwise into 10 mL of absolute ethanol, and stir evenly for 30 min to prepare liquid A. Weigh 1.6175 g of bismuth nitrate and dissolve it in 8 mL of distilled water. After it is completely dissolved, add 8 mL of glacial acetic acid and transfer to a water bath at 40°C until the milky white solution becomes clear to prepare liquid B.

[0029] (2) Gel and Calcination

[0030] Add solution A to solution B drop by drop under vigorous stirring, add 2 mL ethylene glycol (analytical pure) to the mixture, then add 1.2 g silicon oxide, place in a water bath at 70 °C for 120 min to form a light yellow sol . Dry the sol in an oven at 90°C for 2 hours, then treat it at 110°C for 12-16 hours until the sample is dry, grind it and place it in a muffle furnace for calcination at 650°C fo...

Embodiment 3

[0032] A method for preparing silicon oxide supported bismuth titanate photocatalyst, comprising the following process steps:

[0033] (1) Precursor preparation

[0034] Add 1 mL of tetrabutyl titanate dropwise into 10 mL of absolute ethanol, and stir evenly for 30 min to prepare liquid A. Weigh 2 g of bismuth nitrate and dissolve it in 10 mL of distilled water. After it is completely dissolved, add 10 mL of glacial acetic acid and transfer to a 40°C water bath until the milky white solution becomes clear to prepare liquid B.

[0035] (2) Gel and Calcination

[0036] Add solution A to solution B drop by drop under vigorous stirring, add 2 mL ethylene glycol (analytical pure) to the mixture, then add 1.2 g silicon oxide, and place in a water bath at 70°C for 100 min to form a light yellow sol . Dry the sol in an oven at 90°C for 2 hours, then treat it at 110°C for 12-16 hours until the sample is dry, grind it and place it in a muffle furnace for calcination at 700°C for 3 ho...

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Abstract

The invention discloses a method for preparing a silicon-oxide-supported bismuth titanate photocatalyst for photocatalytic degradation of pollutants. The invention aims to uniformly support a bismuth titanate catalyst on a silicon oxide supporter surface in a high-temperature sintering mode to obtain the material with optimal degradation capacity. The silicon-oxide-supported bismuth titanate photocatalyst is prepared by an improved sol-gel preparation technique; and the method comprises the following step: by using bismuth nitrate and tetra-n-butyl titanate as precursors, preparing the high-supporting-capacity high-activity high-stability silicon-oxide-supported bismuth titanate photocatalyst by sol-gel and calcination processes. The keys of the preparation process are refinement of the sol-gel technique and optimization of calcination conditions. The method has the advantages of simple technique, mild conditions and favorable repetitiveness, can be widely used for photocatalytic degradation of organic pollutants, and has wide application prospects in the aspect of environmental treatment.

Description

technical field [0001] The invention relates to a method for preparing an environment-purifying functional material, in particular to a method for preparing a silicon oxide-loaded bismuth titanate photocatalyst. Background technique [0002] Titanate functional materials have good photocatalytic oxidation ability and have very promising application prospects in pollution control. Bismuth titanate compound has a special crystal structure and electronic structure, and the crystal structure contains TiO 6 Octahedral and TiO 4 tetrahedron. This type of material is recognized as having potential application value, which is of great significance for the practical application of environmental pollution control. [0003] Although significant progress has been made in the research on bismuth titanate photocatalysts, there are still many application drawbacks of powdered bismuth titanate photocatalysts. Pure powder particles usually have weak adsorption performance, so the contact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18
Inventor 张文杰
Owner SHENYANG LIGONG UNIV
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