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Sodium bismuth titanate/graphite phase carbon nitride heterojunction piezoelectric photocatalyst and preparation method thereof

A graphite phase carbon nitride, sodium bismuth titanate technology, applied in catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Photocatalyst preparation is complicated and other problems, to achieve the effect of low cost, excellent photocatalytic performance, and improved specific surface area

Inactive Publication Date: 2021-08-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the preparation of existing heterojunction photocatalysts is relatively complicated, the cost is high, and the g-C cannot be fully and maximized. 3 N 4 The catalytic activity of the problem, and provide a bismuth sodium titanate / graphite phase carbon nitride heterojunction piezoelectric photocatalyst and its preparation method

Method used

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  • Sodium bismuth titanate/graphite phase carbon nitride heterojunction piezoelectric photocatalyst and preparation method thereof
  • Sodium bismuth titanate/graphite phase carbon nitride heterojunction piezoelectric photocatalyst and preparation method thereof
  • Sodium bismuth titanate/graphite phase carbon nitride heterojunction piezoelectric photocatalyst and preparation method thereof

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Embodiment 1

[0047] A preparation method of sodium bismuth titanate / graphite phase carbon nitride heterojunction piezoelectric photocatalyst, comprising the following steps:

[0048] Step 1, synthesis of NBT nanoparticles:

[0049] 5.6ml of tetra-n-butyl titanate, 3.88g of bismuth nitrate pentahydrate and 14.4g of sodium hydroxide were dispersed in 80ml of deionized water, and stirred at room temperature for 2 hours to obtain a mixed solution. Use a measuring cylinder to measure 60ml of the obtained mixed solution, pour it into a 100ml Teflon lining, put the lining into the matching stainless steel outer lining, place the whole in a well-type furnace, and raise the temperature to 160°C and keep at this temperature for 24h. Pour the final solution and the precipitate into a centrifuge tube, wash with deionized and absolute ethanol three times, centrifuge at 10000r / min for 5min, pour off the unreacted precursor solution, and place the precipitate in an oven Dry at 80°C for 12h to obtain NB...

Embodiment 2

[0060] A preparation method of sodium bismuth titanate / graphite phase carbon nitride heterojunction piezoelectric photocatalyst, comprising the following steps:

[0061] Step 1, synthesis of NBT nanoparticles:

[0062] 5.6ml of tetra-n-butyl titanate, 3.88g of bismuth nitrate pentahydrate and 14.4g of sodium hydroxide were dispersed in 80ml of deionized water, and stirred at room temperature for 2 hours to obtain a mixed solution. Use a measuring cylinder to measure 60ml of the obtained mixed solution, pour it into a 100ml Teflon lining, put the lining into the matching stainless steel outer lining, place the whole in a well-type furnace, and raise the temperature to 180°C and keep at this temperature for 18h. Pour the final solution and the precipitate into a centrifuge tube, wash with deionized and absolute ethanol three times, centrifuge at 10000r / min for 5min, pour off the unreacted precursor solution, and place the precipitate in an oven Dry at 80°C for 12h to obtain NB...

Embodiment 3

[0068] A preparation method of sodium bismuth titanate / graphite phase carbon nitride heterojunction piezoelectric photocatalyst, comprising the following steps:

[0069] Step 1, synthesis of NBT nanoparticles:

[0070] 5.6ml of tetra-n-butyl titanate, 3.88g of bismuth nitrate pentahydrate and 14.4g of sodium hydroxide were dispersed in 80ml of deionized water, and stirred at room temperature for 2 hours to obtain a mixed solution. Use a measuring cylinder to measure 60ml of the obtained mixed solution, pour it into a 100ml Teflon lining, put the lining into the matching stainless steel outer lining, place the whole in a well-type furnace, and raise the temperature to 200°C and keep at this temperature for 12h. Pour the final solution and the precipitate into a centrifuge tube, wash with deionized and absolute ethanol three times, centrifuge at 10000r / min for 5min, pour off the unreacted precursor solution, and place the precipitate in an oven Dry at 80°C for 12h to obtain NB...

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Abstract

The invention discloses a sodium bismuth titanate / graphite phase carbon nitride heterojunction piezoelectric photocatalyst and a preparation method thereof, and solves the problems that an existing heterojunction photocatalyst is relatively complex in preparation and relatively high in cost, and the catalytic activity of g-C3N4 cannot be fully improved to the maximum extent. The graphite-phase carbon nitride photocatalyst is synthesized through a one-step thermal polymerization method, sodium bismuth titanate nanoparticles are synthesized through a one-step hydrothermal process, then the NBT / g-C3N4 heterojunction piezoelectric photocatalyst is obtained through simple grinding, mixing and calcination, and g-C3N4 can absorb part of visible light to generate photon-generated carriers. In the stirring process, charges are generated on the surface of the piezoelectric material NBT due to external pressure, and meanwhile, a built-in electric field is formed at the interface of the two materials through piezoelectric polarization to drive photo-induced electrons and holes to move in opposite directions. By controlling the ratio of NBT to g-C3N4, piezoelectric photocatalysts with different photocatalytic properties can be obtained and used for organic dye degradation and hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic energy conversion, and in particular relates to a bismuth sodium titanate / graphite phase carbon nitride heterojunction piezoelectric photocatalyst and a preparation method thereof. Background technique [0002] The energy shortage crisis and environmental pollution caused by global industrialization are two major problems in the 21st century. Photocatalysis is a clean, safe, and sustainable technology that converts endless solar energy into chemical energy. [0003] In the past ten years, graphitic carbon nitride (g-C 3 N 4 ) has attracted widespread attention due to its advantages of absorbing part of visible light, suitable band edge position, high physical and chemical thermal stability, and economical and environmental protection; but compared with theoretical single-synthetic materials, its specific surface area is very low, and there are few reactive sites. The crystallinity leads ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/18B01J37/08B01J37/10B01J37/00C02F1/30C01B3/04
CPCB01J27/24B01J23/18B01J23/002B01J37/082B01J37/10B01J37/0036B01J37/08C02F1/30C01B3/042B01J2523/00C02F2305/10C02F2101/308B01J35/23B01J35/33B01J35/39B01J2523/12B01J2523/47B01J2523/54Y02E60/36
Inventor 王维佳樊慧庆雷林
Owner NORTHWESTERN POLYTECHNICAL UNIV
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