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Preparation method of oxygen-producing photocatalyst of composite oxides

A composite oxide and photocatalyst technology, applied in the field of visible light catalysis, can solve the problems of difficult control of the crystal structure of bismuth vanadate, high energy consumption in the preparation process, noise and dust pollution, etc., achieve uniform crystal shape, reduce production costs, and increase catalysis active effect

Inactive Publication Date: 2009-02-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This traditional method has a simple technological process, but the disadvantage of this method is that vanadium pentoxide is a highly toxic substance, which is very harmful to the human body; the crystal structure of bismuth vanadate prepared by solid-phase sintering is not easy to control, which reduces the catalytic effect; and the preparation The process is very energy-intensive and creates noise and dust pollution

Method used

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  • Preparation method of oxygen-producing photocatalyst of composite oxides
  • Preparation method of oxygen-producing photocatalyst of composite oxides
  • Preparation method of oxygen-producing photocatalyst of composite oxides

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Dissolve 3.69g of bismuth nitrate in 50ml of nitric acid with a concentration of 2M, dissolve 0.89g of ammonium metavanadate in 50ml of 40°C water, mix, add 0.06g of sodium lauryl sulfate, stir evenly, and adjust with nitric acid pH=0. Transfer the solution into an autoclave, react at 190°C for 50 hours, cool, filter with suction, wash, and dry (corresponding to scanning electron microscope figure 1 , transmission electron microscope Figure 6 and electron diffraction Figure 7), the prepared monoclinic scheelite bismuth vanadate catalyst was irradiated by a 300-watt mercury lamp (wavelength range 300-380 nanometers) and a 300-watt xenon lamp (wavelength greater than 420 nanometers) The rate of oxygen production by catalytic decomposition of water was detected by Agilent 4890D gas chromatography, and finally the oxygen production rate of the catalyst was calculated according to the peak area. The yield of ultraviolet photocatalytic oxygen production is 50umol / ...

Embodiment 2

[0022] Embodiment 2: 7.37g bismuth nitrate is dissolved in 50ml concentration and is the nitric acid of 2.5M, and 1.78g ammonium metavanadate is dissolved in 50ml 45 ℃ water, mix, add sodium dodecylsulfonate 0.13g, stir well, Adjust the pH to 1 with nitric acid; transfer the solution into an autoclave, react at 220° C. for 40 hours, cool, filter with suction, wash and dry. (corresponding to SEM figure 2 ), the photocatalytic test method is the same as in Example 1, the ultraviolet photocatalytic oxygen production rate is 40umol / h, and the visible light photocatalytic oxygen production rate is 140umol / h.

Embodiment 3

[0023] Embodiment 3: 14.74g bismuth nitrate is dissolved in 50ml concentration and is the nitric acid of 2.5M, and 3.56g ammonium metavanadate is dissolved in 50ml50 ℃ hot water, mix, add sodium lauryl sulfate 0.24g, stir well, Adjust the pH to 2 with nitric acid, transfer the solution into an autoclave, react at 260°C for 30 hours, cool, filter with suction, wash and dry. (corresponding to XRD Figure 5 , and the SEM image 3 and Figure 4 ), the photocatalytic test method is the same as that of Example 1, the yield of ultraviolet photocatalytic oxygen production is 90umol / h, and the yield of visible light catalytic photocatalytic oxygen production is 355umol / h.

[0024] The existing hydrothermally synthesized photocatalyst has an oxygen production activity of 30-40umol / h under ultraviolet light catalysis and 60-70umol / h of oxygen production under visible light catalysis. The invention increases the catalytic activity of producing oxygen by photolyzing water.

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Abstract

A preparation method of oxide photochemical catalyst prepared by composite oxide belongs to visible light catalysis field. The preparation process is: it dissolves bismuth nitrate containing crystal water into 2-2.5M nitrate, the mass concentration of bismuth nitrate is 7.4%--29.5%; dissolves metavanadate ammonium into 40-50DEG C hot water, the mass concentration of metavanadate ammonium is 1.8%-7.1%; mixes said two solution and adds surface activator into it, stirs it uniformly and adjusts it with aqua forties until the pH is 0-2; heats it in press-still and maintains temperature of 190-260DEG C, the reaction time is 30-50 hours; then cools it and sucks it, washes repeatedly with deionized water until the solution is colorless and clear, dries it. The preparation precess avoids using acute-toxic vanadic anhydride powder and precipitant, and no acute-toxic intermediate product is generated; the active of oxygen prepared by ultraviolet light and using the oxide photochemical catalyst can reach 40-90umol / h and the active of oxygen catalyzed by visible light is 70-355umol / h.

Description

technical field [0001] The invention relates to a method for preparing a composite oxide photocatalyst for oxygen production, which belongs to the field of visible light catalysis Background technique [0002] Bismuth vanadate includes three crystal structures, tetragonal scheelite structure, tetragonal zircon structure and monoclinic scheelite structure with photocatalytic activity. Traditional bismuth vanadate with monoclinic scheelite structure is prepared by mixing bismuth oxide powder with vanadium pentoxide powder, adding acetone or alcohol to mechanical ball milling, and then high-temperature heat treatment or melting reaction. The reaction temperature is above 300°C. This traditional method has a simple technological process, but the disadvantage of this method is that vanadium pentoxide is a highly toxic substance, which is very harmful to the human body; the crystal structure of bismuth vanadate prepared by solid-phase sintering is not easy to control, which reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31
Inventor 杨涛夏定国王振尧于春洋
Owner BEIJING UNIV OF TECH
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