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Preparation method of hollow silver phosphotungstate visible-light-induced photocatalyst

A hollow silver phosphotungstate, visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, phosphates, etc., can solve the problems of low photocatalytic activity, small specific surface area, low crystallinity, etc., and achieve high photocatalysis. The effect of active, multi-surface active sites, strong surface acidity

Inactive Publication Date: 2013-08-14
HEILONGJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that the current preparation of silver phosphotungstate is obtained by reaction at a relatively low temperature, with low crystallinity and poor stability, and what is formed are all larger crystals with a small specific surface area, so the photocatalytic activity is relatively low. Low problem, and the preparation method of a kind of hollow silver phosphotungstate visible light catalyst provided

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  • Preparation method of hollow silver phosphotungstate visible-light-induced photocatalyst
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  • Preparation method of hollow silver phosphotungstate visible-light-induced photocatalyst

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specific Embodiment approach 1

[0023] Specific embodiment one: In this embodiment, a method for preparing a hollow silver phosphotungstate visible light catalyst is specifically prepared according to the following steps:

[0024] 1. Mix phosphotungstic acid, alcohol and water evenly, then add silver nitrate mixture, then control the temperature at 5°C-25°C, stir at 100-300 rpm, and stir for 1h-4h to obtain a uniform suspension , wherein the silver nitrate mixed solution is an organic amine solution of silver nitrate or an inorganic ammonia solution of silver nitrate;

[0025] 2. Put the suspension obtained in step 1 into the reaction kettle, control the temperature at 120°C-180°C for hydrothermal reaction, keep it for 5h-72h, then cool to room temperature, then filter, wash with water until neutral, and dry. get powder;

[0026] 3. Heat the powder obtained in step 2 to a temperature of 400°C-800°C, control the heating rate to 1-10°C / min, and roast for 2h-8h to obtain a hollow silver phosphotungstate cataly...

specific Embodiment approach 2

[0027] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio of phosphotungstic acid, alcohol and water in Step 1 is 2.88:5:5-25. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Embodiment 3: This embodiment differs from Embodiment 1 in that the ratio of the amount of phosphotungstic acid to silver nitrate in step 1 is 0.1-3. Others are the same as in the first embodiment.

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Abstract

The invention provides a preparation method of a hollow silver phosphotungstate visible-light-induced photocatalyst, relates to a preparation method of the silver phosphotungstate visible-light-induced photocatalyst, and aims at solving the problems that the conventional silver phosphotungstate is prepared at a relatively low temperature, has low degree of crystallinity and poor stability, always generates relatively large crystals so that the specific surface area is small, and therefore, the photocatalytic activity is relatively low. The preparation method comprises the following steps of: 1, preparing a suspension turbid liquid; 2, preparing powder; and 3, roasting. The hollow silver phosphotungstate visible-light-induced photocatalyst prepared by the method has the characteristics that the specific surface area is large, a hollow structure is provided, and the visible-light catalytic activity is higher than that of common silver phosphotungstate and commercial Degussa P25. The preparation method provided by the invention is applied to preparation of the hollow silver phosphotungstate visible-light-induced photocatalyst.

Description

technical field [0001] The invention relates to a method for preparing a catalyst. Background technique [0002] In recent years, the increasingly severe environmental pollution has seriously threatened human health and life. As an advanced oxidation and non-selective catalytic process, photocatalysis has unique advantages in degrading organic pollutants. Therefore, semiconductor photocatalysts have attracted more and more attention. They are widely used in sewage treatment, sterilization, photolysis of water, nitrogen fixation, CO 2 Restoration and other aspects have achieved rapid development. Traditional semiconductors such as titanium dioxide can only absorb ultraviolet light, but cannot use visible light, which accounts for about half of the energy of sunlight, so their applications are greatly limited. It is worth noting that among many semiconductor photocatalysts, silver phosphotungstate has attracted much attention due to its advantages of absorbing visible light...

Claims

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Application Information

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IPC IPC(8): C01B25/26B01J27/188
Inventor 周卫付宏刚田国辉邢子鹏潘凯
Owner HEILONGJIANG UNIV
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