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Preparation method of oxygen-producing photocatalyst of composite oxides

A composite oxide and photocatalyst technology, which is applied in the field of visible light catalysis, can solve the problems of reducing catalytic effect, noise and dust pollution, and large human injury, and achieves the effects of simple process, low energy consumption, and reduced production cost.

Inactive Publication Date: 2007-08-01
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 well, and use nitric acid Adjust pH=0. Transfer the solution into an autoclave, react at 190°C for 50 hours, cool, filter with suction, wash, and dry (corresponding to SEM Figure 1, TEM Figure 6 and Electron Diffraction Figure 7), and the prepared monoclinic scheelite The bismuth vanadate catalyst catalytically decomposes water to produce oxygen under the irradiation of a 300-watt mercury lamp (wavelength range 300-380 nm) and a 300-watt xenon lamp (wavelength greater than 420 nm). The oxygen production rate of the catalyst. The yield of ultraviolet photocatalytic oxygen production is 50umol / h, and the yield of visible light catalytic oxygen production is 70umol / h.

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 scanning electron microscope Figure 2), the photocatalytic test method is the same as in Example 1, the yield of ultraviolet photocatalytic oxygen production is 40umol / h, and the yield of visible light catalytic oxygen production is 140umol / h.

Embodiment 3

[0023] Example 3: Dissolve 14.74g of bismuth nitrate in 50ml of nitric acid with a concentration of 2.5M, dissolve 3.56g of ammonium metavanadate in 50ml of 50°C hot water, mix, add 0.24g of sodium lauryl sulfate, and stir evenly , adjust pH=2 with nitric acid, transfer the solution into autoclave, react at 260°C for 30 hours, cool, filter with suction, wash and dry. (corresponding to XRD Figure 5, and SEM Figure 3 and Figure 4), the photocatalytic test method is the same as in Example 1, the ultraviolet photocatalytic oxygen production rate is 90umol / h, and the visible light photocatalytic photocatalytic oxygen production rate 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 preparation method of a composite oxide oxygen-producing photocatalyst, 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 reduces th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C01B13/02
Inventor 杨涛夏定国王振尧于春洋
Owner BEIJING UNIV OF TECH
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