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Mesoporous tungstate photocatalysis material and preparation method thereof

A technology of mesoporous tungstate and tungstate, which is applied in chemical instruments and methods, tungsten compounds, physical/chemical process catalysts, etc., to achieve the effects of improving thermal stability, protecting against collapse, and avoiding fusion growth

Inactive Publication Date: 2012-03-14
范晓星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no research on mesoporous tungstate and its preparation in domestic research

Method used

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  • Mesoporous tungstate photocatalysis material and preparation method thereof
  • Mesoporous tungstate photocatalysis material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] W excess

[0033] Dissolve 0.004mol ammonium tungstate in 100ml water, accelerate the dissolution in ultrasonic to obtain a clear liquid. Dissolve 0.004mol bismuth nitrate in 100ml acetic acid and stir until completely dissolved. The above two solutions were mixed to form a milky white cloudy liquid, and the cloudy liquid was stirred, heated and evaporated to dryness to obtain a solid. The obtained solid is calcined at 200-1000°C. The calcined product was treated with 1M Na 2 CO 3 treatment, the mesoporous Bi 2 WO 6 photocatalytic material.

Embodiment 2

[0035] Excess Bi

[0036] Dissolve 0.004mol ammonium tungstate in 100ml water, accelerate the dissolution in ultrasonic to obtain a clear liquid. Dissolve 0.012mol bismuth nitrate in 100ml acetic acid and stir until completely dissolved. The above two solutions were mixed to form a milky white cloudy liquid, and the cloudy liquid was stirred, heated and evaporated to dryness to obtain a solid. The obtained solid is calcined at 200-1000°C. Treat the calcined product with 50% acetic acid solution to obtain mesoporous Bi 2 WO 6 photocatalytic material.

Embodiment 3

[0038] use chelating agents

[0039] Dissolve 0.004mol ammonium tungstate in 100ml water, add 0.008mol citric acid, and accelerate the dissolution in ultrasonic to obtain a clear liquid. Dissolve 0.012mol bismuth nitrate and 0.024mol EDTA in 100ml water and stir until completely dissolved. The above two solutions were mixed to form a milky white cloudy liquid, and the cloudy liquid was stirred and evaporated to dryness to obtain a solid. The obtained solid is calcined at 200-1000°C. Treat the calcined product with 50% acetic acid solution to obtain mesoporous Bi 2 WO 6 photocatalytic material.

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Abstract

The invention provides a mesoporous tungstate photocatalysis material and a preparation method thereof. According to the invention, metal inorganic salt and alkoxide are used as precursors, and molecular level mixing of metallic elements in a precursor solution is realized through addition of a chelating agent so as to avoid phase separation during evaporation of solvents; the method of an inorganic pore forming agent is used to allow a certain metallic element to be excessive in the process of synthesis and to exceed stoichiometric proportion, a part of the excessive metallic element participates in a reaction in the process of roasting to produce tungstate, and the rest part of the excessive metallic element is precipitated to form metal oxide or salt, functioning as a pore forming agent and stabilizing a meso-structure; the inorganic pore forming agent is removed by using treating methods of acid, alkali, dissolving and the like to obtain the mesoporous tungstate material. The invention has the advantages of a simple synthesis process, no harsh conditions and practicable operation. When applied in indoor air purification, the mesoporous tungstate photocatalysis material obtained in the invention has an obvious effect in removing formaldehyde, with a removal rate up to 92%.

Description

technical field [0001] The invention relates to a method for synthesizing mesoporous (mesoporous) materials. Especially for tungstate multi-element metal oxide mesoporous materials. technical background [0002] At present, the problem of indoor and outdoor environmental pollution is becoming increasingly prominent. Photocatalytic materials can use sunlight to degrade various gas-phase and liquid-phase pollutants that are harmful to the environment, and mineralize them into harmless water and carbon dioxide. Photocatalytic purification of the environment is a very economical, convenient and feasible method, and its related research has received very high attention. However, the current photocatalytic materials have two problems, one is poor response to visible light, and the other is low efficiency. Due to the mesoporous channel structure, mesoporous photocatalytic materials can provide a large number of reaction sites for photocatalytic reactions, thereby greatly improvin...

Claims

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Application Information

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IPC IPC(8): C01G41/00B01J23/30
Inventor 范晓星
Owner 范晓星
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