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Bi2O3/(BiO)2CO3 heterojunction catalyst with visible photocatalytic activity and preparation method for Bi2O3/(BiO)2CO3 heterojunction catalyst

A catalytic activity, visible light technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve problems such as catalytic activity limitation, achieve good photocatalytic performance, Simple operation and low equipment requirements

Inactive Publication Date: 2015-09-23
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bismuth subcarbonate ((BiO) 2 CO 3 ) The bandgap range fluctuates between 2.87 and 3.5eV depending on the preparation method, so the catalytic activity in the visible light region is limited

Method used

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  • Bi2O3/(BiO)2CO3 heterojunction catalyst with visible photocatalytic activity and preparation method for Bi2O3/(BiO)2CO3 heterojunction catalyst
  • Bi2O3/(BiO)2CO3 heterojunction catalyst with visible photocatalytic activity and preparation method for Bi2O3/(BiO)2CO3 heterojunction catalyst
  • Bi2O3/(BiO)2CO3 heterojunction catalyst with visible photocatalytic activity and preparation method for Bi2O3/(BiO)2CO3 heterojunction catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: 2.3 mmol of bismuth nitrate pentahydrate and 3.0 mmol of urea were mixed and dissolved in 30 ml of deionized water, and stirred at room temperature for 30 min to form a precursor solution.

[0030] Step2: Transfer the precursor solution obtained in Step1 to a polytetrafluoroethylene-lined autoclave, keep it at 160°C for 12 hours, and cool to room temperature with the furnace.

[0031] Step3: Wash the powder obtained in Step2 with deionized water and absolute ethanol in sequence, and then vacuum-dry at 80°C to obtain (BiO) 2 CO 3 powder.

[0032] Step4: Get the (BiO) obtained in Step3 2 CO 3 The powder is calcined at 400°C for 60 minutes to obtain Bi with visible photocatalytic activity. 2 o 3 / (BiO) 2 CO 3heterojunction catalysts.

[0033] Step5: For comparison and description, take the (BiO) obtained in Step3 2 CO 3 The powder was calcined at 500°C for 4h, and the obtained sample was pure phase Bi 2 o 3 Powder.

[0034] Right (BiO) 2 CO 3 Powder,...

Embodiment 2

[0043] Step1: Mix and dissolve 2.5mmol of bismuth citrate and 3.1mmol of urea in 30ml of deionized water, add 10ml of concentrated ammonia water dropwise with stirring at room temperature, and then stir at room temperature for 30min to form a precursor solution.

[0044] Step2: Transfer the precursor solution obtained in Step1 to a polytetrafluoroethylene-lined autoclave, keep it at 180°C for 24 hours, and cool to room temperature with the furnace.

[0045] Step3: Wash the powder obtained in Step2 with deionized water and absolute ethanol in sequence, and then vacuum-dry at 80°C to obtain (BiO) 2 CO 3 powder.

[0046] Step4: Get the (BiO) obtained in Step3 2 CO 3 The powder is calcined at 400°C for 60 minutes to obtain Bi with visible photocatalytic activity. 2 o 3 / (BiO) 2 CO 3 heterojunction catalysts.

[0047] For the sample Bi obtained in Step4 2 o 3 / (BiO) 2 CO 3 The heterojunction was tested by XRD. Test pattern such as image 3 shown. image 3 It shows th...

Embodiment 3

[0050] Step 1: 2.3 mmol of bismuth nitrate pentahydrate and 3.0 mmol of urea were mixed and dissolved in 30 ml of deionized water, and stirred at room temperature for 30 min to form a precursor solution.

[0051] Step2: Transfer the precursor solution obtained in Step1 to a polytetrafluoroethylene-lined autoclave, keep it at 160°C for 12 hours, and cool to room temperature with the furnace.

[0052] Step3: Wash the powder obtained in Step2 with deionized water and absolute ethanol in sequence, and then vacuum-dry at 80°C to obtain (BiO) 2 CO 3 powder.

[0053] Step4: Get the (BiO) obtained in Step3 2 CO 3 The powder was calcined at 400°C for 20 minutes to obtain Bi with visible photocatalytic activity. 2 o 3 / (BiO) 2 CO 3 heterojunction catalysts.

[0054] For the sample Bi obtained in Step4 2 o 3 / (BiO) 2 CO 3 The heterojunction was tested by XRD. Test pattern such as Figure 5 shown. Figure 5 It shows that the sample obtained in Step4 is indeed Bi 2 o 3 / (B...

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Abstract

The invention discloses a preparation method for a Bi2O3 / (BiO)2CO3 heterojunction catalyst with visible photocatalytic activity. The preparation method comprises the following steps: mixing and dissolving bismuth nitrate pentahydrate or bismuth citrate and urea into deionized water, and carrying out room temperature stirring to form a precursor solution; transferring the precursor solution into a high-pressure reaction kettle, preserving the temperature under 160 to 180 DEG C for 12 to 24 hours, and performing furnace cooling to room temperature; washing the obtained powder by deionized water and absolute ethyl alcohol in sequence, and then performing vacuum drying under the temperature of 80 DEG C to obtain (BiO)2CO3 powder; putting the (BiO)2CO3 powder under the temperature of 400 to 450 DEG C for calcining for 20 to 60min to obtain the Bi2O3 / (BiO)2CO3 heterojunction catalyst. The preparation method has the beneficial effects that hydrothermal treatment is firstly carried out, and then calcining is performed to obtain a product. The preparation method is easy to operate, and the equipment requirement is low; various complicated synthesis devices are not needed; the formation of a heterojunction interface is favorable for transferring of photo-generated electrons and photo-generated holes and the improvement of the catalytic activity; the prepared heterojunction catalyst is higher in photocatalysis performance than that of pure Bi2O3 and pure (BiO)2CO3.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a Bi catalyst with visible light catalytic activity. 2 o 3 / (BiO) 2 CO 3 A heterojunction catalyst and a preparation method thereof belong to the technical field of photocatalysts. Background technique [0002] In the field of environmental pollution control, photocatalysis is an emerging technology that can efficiently remove various toxic and harmful substances in the environment by exciting active free radicals generated by semiconductors through solar energy, and has broad application prospects. [0003] At present, the most mature photocatalyst in the market is TiO 2 , its biggest advantage is that it is stable, non-toxic and cheap and easy to get. [0004] However, as a wide bandgap semiconductor (3.2eV), making TiO 2 It can only absorb energy in the ultraviolet region (λ<420nm) of the solar spectrum, which limits the improvement of photocatalytic acti...

Claims

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Application Information

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IPC IPC(8): B01J23/18B01J37/10C02F1/30A62D3/17C02F101/16A62D101/45
Inventor 黄宇王薇曹军骥
Owner INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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