Preparation method for easy-to-recover infusorial earth/Ta3N5 visible-light photocatalyst

A technology of photocatalyst and diatomite, which is applied in the field of preparation of visible light photocatalyst, can solve the problems of limited large-scale application and wide forbidden band width, etc., and achieves the effects of low equipment requirements, easy recovery and simple preparation method.

Inactive Publication Date: 2012-11-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many semiconductors with excellent chemical stability have a relatively wide band gap, and most of them require ultraviolet light as an excitation light source. Ultraviolet light only accounts for 4% of the incident sunlight energy, which limits its large-scale application to a large extent.

Method used

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  • Preparation method for easy-to-recover infusorial earth/Ta3N5 visible-light photocatalyst
  • Preparation method for easy-to-recover infusorial earth/Ta3N5 visible-light photocatalyst
  • Preparation method for easy-to-recover infusorial earth/Ta3N5 visible-light photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add 0.1g of tantalum pentachloride and 0.1g of diatomite powder into 8mL of absolute ethanol, ultrasonicate and stir for 2 minutes each to obtain a colloidal suspension.

[0031] (2) Then pour the above dehydrated alcohol solution containing tantalum pentachloride and diatomaceous earth into the crucible, and place the crucible on the top of the sealable container. The bottom of the sealable container is prefilled with 3 mL of distilled water. After sealing the container, put it into an oven and heat it to 120° C. and keep it warm for 10 hours. After the heat preservation is completed and naturally cooled to room temperature, open the device, take out the crucible, pour out the powder, wash with distilled water and absolute ethanol for 3 times, and vacuum-dry at 60°C for 8 hours to obtain the required diatomite / Ta 2 o 5 Core / shell powder.

[0032] (3) Diatomaceous earth / Ta 2 o 5 The core / shell composite powder is placed in a horizontally placed alumina tube fur...

Embodiment 2

[0036] (1) Add 0.1g of tantalum pentachloride and 0.1g of diatomite powder into 8mL of absolute ethanol, ultrasonicate and stir for 2 minutes each to obtain a colloidal suspension.

[0037] (2) Then pour the above dehydrated alcohol solution containing tantalum pentachloride and diatomaceous earth into the crucible, and place the crucible on the top of the sealable container. The bottom of the sealable container is prefilled with 3 mL of distilled water. After sealing the container, put it into an oven and heat it to 120° C. and keep it warm for 10 hours. After the heat preservation is completed and naturally cooled to room temperature, open the device, take out the crucible, pour out the powder, wash with distilled water and absolute ethanol for 3 times, and vacuum-dry at 60°C for 8 hours to obtain the required diatomite / Ta 2 o 5 Core / shell powder.

[0038] (3) Diatomaceous earth / Ta 2 o 5 The core / shell composite powder is placed in a horizontally placed alumina tube fur...

Embodiment 3

[0042] (1) Add 0.2g of tantalum pentaiodide and 0.2g of diatomaceous earth powder into 8mL of absolute ethanol, ultrasonicate and stir for 2 minutes each to obtain a colloidal suspension.

[0043] (2) Then pour the above dehydrated alcohol solution containing tantalum pentachloride and diatomaceous earth into the crucible, and place the crucible on the top of the sealable container. The bottom of the sealable container is prefilled with 10 mL of distilled water. After sealing the container, put it into an oven and heat it to 180° C. and keep it warm for 20 hours. After the heat preservation is completed and naturally cooled to room temperature, open the device, take out the crucible, pour out the powder, wash with distilled water and absolute ethanol for 3 times, and vacuum-dry at 60°C for 8 hours to obtain the required diatomite / Ta 2 o 5 Core / shell powder.

[0044] (3) Diatomaceous earth / Ta 2 o 5 The core / shell composite powder is placed in a horizontally placed alumina ...

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Abstract

The invention relates to a preparation method for an easy-to-recover infusorial earth / Ta3N5 visible-light photocatalyst. The method comprises the steps as follows: (1), tantalate or inorganic tantalate is dissolved in an anhydrous low alcohol, powder of infusorial earth is added, and after ultrasonic treatment and stirring, a uniform mixture is obtained; (2), the uniform mixture is placed in a sealed container which is filled with distilled water in advance, the uniform mixture and the distilled water are not in direct contact, the sealed container is heated, kept warm and cooled to a room temperature, and infusorial earth / Ta2O5 nuclear / shell power is obtained after washing and drying; and (3), the infusorial earth / Ta2O5 nuclear / shell power is placed in an alumina pipe furnace, the alumina pipe furnace is introduced with high-purity ammonia gas, heated up, kept warm, and naturally cooled to a room temperature under flowing ammonia gas, and then the infusorial earth / Ta3N5 visible-light photocatalyst is obtained. The preparation method is simple, has low requirements on equipment, and is suitable for industrial production; and the obtained infusorial earth / Ta3N5 powder has a strong adsorbability and good visible light responsiveness, and is easy to recover.

Description

technical field [0001] The invention belongs to the field of preparation of visible light photocatalysts, in particular to an easily recyclable diatomite / Ta 3 N 5 Preparation method of visible light photocatalyst. Background technique [0002] Due to the potential application of semiconductor photocatalysts in wastewater treatment, air purification, green energy, etc., it has attracted extensive attention in different disciplines including chemistry, physics, materials, environment, information, etc. However, many semiconductors with excellent chemical stability have a relatively wide band gap, and most of them require ultraviolet light as an excitation light source. Ultraviolet light only accounts for 4% of the incident sunlight energy, which limits its large-scale application to a large extent. . The energy of visible light accounts for as high as 43% of the energy of incident sunlight. Therefore, the development of high-efficiency photocatalysts with visible light resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00
Inventor 张青红石福志王岚王宏志李耀刚
Owner DONGHUA UNIV
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