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A kind of preparation method of photocatalyst

A photocatalyst and chitin technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of non-recyclable use and short absorption wavelength, and achieve Good solar energy, simple preparation method, and easy operation

Active Publication Date: 2017-07-07
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, chitin and titanium raw materials are used to prepare modified TiO 2 However, when the prepared photocatalyst absorbs visible light, the absorption wavelength is shorter, it cannot utilize solar energy to a greater extent, and it cannot be recycled

Method used

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  • A kind of preparation method of photocatalyst
  • A kind of preparation method of photocatalyst
  • A kind of preparation method of photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing a photocatalyst, comprising the steps of:

[0026] (1) Chitin pretreatment, adding 50ml of acetic acid with a concentration of 20% to 2g of chitin, stirring at 50°C for 2h, and then centrifuged for use;

[0027] (2) Butyl titanate pretreatment, 40ml of absolute ethanol, 10ml of glacial acetic acid and 8g of butyl titanate were mixed and stirred for 15min;

[0028] (3) Prepare the photocatalyst, add the mixed solution and 4g urea prepared in step (2) to the chitin obtained after the treatment in step (1), then stir, and then distill under reduced pressure to obtain a solid product;

[0029] (4) Calcining the solid product obtained in step (3) at a temperature of 200°C for 2h, and then cooling naturally to room temperature to obtain nitrogen-doped TiO 2 / Chitin photocatalyst finished product.

Embodiment 2

[0031] A method for preparing a photocatalyst, comprising the steps of:

[0032] (1) chitin pretreatment, adding 50ml of acetic acid with a concentration of 20% to 1g of chitin, stirring for 1h at 40°C, and centrifuging;

[0033] (2) Butyl titanate pretreatment, 40ml absolute ethanol, 10ml glacial acetic acid and 4g butyl titanate were mixed and stirred for 15min;

[0034] (3) Prepare the photocatalyst, add the mixed solution and 4g urea prepared in step (2) to the chitin obtained after the treatment in step (1), then stir, and then distill under reduced pressure to obtain a solid product;

[0035] (4) Calcinate the solid product obtained in step (3) at a temperature of 300°C for 2h, then cool it down to room temperature naturally to obtain nitrogen-doped TiO 2 / Chitin photocatalyst finished product.

Embodiment 3

[0037] A method for preparing a photocatalyst, comprising the steps of:

[0038] (1) chitin pretreatment, adding 50ml of acetic acid with a concentration of 20% to 4g of chitin, stirring at 60°C for 3h, and then centrifuging;

[0039] (2) Butyl titanate pretreatment, 40ml absolute ethanol, 10ml glacial acetic acid and 16g butyl titanate were mixed and stirred for 15min;

[0040] (3) Prepare the photocatalyst, add the mixed solution and 4g urea prepared in step (2) to the chitin obtained after the treatment in step (1), then stir, and then distill under reduced pressure to obtain a solid product;

[0041] (4) Calcining the solid product obtained in step (3) at a temperature of 400°C for 2h, and then cooling naturally to room temperature to obtain nitrogen-doped TiO 2 / Chitin photocatalyst finished product.

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Abstract

The invention discloses a preparation method of a photocatalyst, which comprises the following steps: (1) chitin pretreatment, adding acid to chitin, then stirring, and centrifugal separation; (2) butyl titanate pretreatment, anhydrous Ethanol, glacial acetic acid and butyl titanate are mixed and stirred; (3) preparing photocatalyst, adding the mixed solution and urea prepared in step (2) to the chitin obtained after the treatment in step (1), then stirring, and then reducing Pressure distillation afforded a solid product. (4) calcining the solid product obtained in step (3), and then cooling naturally to obtain a finished nitrogen-doped TiO2 / chitin photocatalyst. The photocatalyst prepared by the present invention can absorb visible light with a long wavelength, can better utilize solar energy, and has good catalytic activity. When pH=3, it reacts for 2 hours, and the residual rate of methyl orange is 63%. High catalytic activity, can also be recycled. The preparation method is simple and convenient to operate.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a preparation method of photocatalysts. Background technique [0002] Visible light (400nm-700nm) accounts for about 43% of sunlight, so the preparation of catalysts with high catalytic activity and stable form under visible light has become a research hotspot. TiO 2 Since it was found to have a photocatalytic effect, it has been widely studied and applied. It has the characteristics of wide source, non-toxic, high temperature resistance, acid and alkali corrosion resistance, but because its threshold is 3.2ev, it can only absorb ultraviolet light, and ultraviolet light only accounts for 3-5% of sunlight, resulting in its light utilization rate lower. The photogenerated carriers and holes generated by the photocatalytic process are easy to recombine and their TiO 2 High dispersion, not easy to recycle. Currently modified TiO 2 The means mainly include doping of metal and non-m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C02F1/30
Inventor 熊德元王胜武
Owner GUANGXI UNIV