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Preparation method for regulating and controlling K2Ti4O9 band gap by using transition metal ions and photocatalytic application

A technology of transition metal ions and ions is applied in the field of photocatalytic degradation, which can solve the problems of low utilization rate of visible light, and achieve the effects of improving photocatalytic efficiency, simple method, and efficient charge-hole separation efficiency.

Inactive Publication Date: 2021-11-19
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, the present invention has designed a simple method of introducing transition metal ions to K through ion exchange. 2 Ti 4 o 9 The interlayer method realizes the adjustment of its optical bandgap and responds to visible light, thereby solving the problem of low utilization rate of visible light

Method used

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  • Preparation method for regulating and controlling K2Ti4O9 band gap by using transition metal ions and photocatalytic application
  • Preparation method for regulating and controlling K2Ti4O9 band gap by using transition metal ions and photocatalytic application
  • Preparation method for regulating and controlling K2Ti4O9 band gap by using transition metal ions and photocatalytic application

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Embodiment 1

[0020] This embodiment includes the following steps:

[0021] (1) Weigh titanium dioxide and potassium carbonate according to the ratio of Ti:K=2:1, mix and ball mill for 12 hours, heat in an air atmosphere at 1000°C for 1 hour, then disperse the product in dilute hydrochloric acid, wash and dry to obtain K 2 Ti 4 o 9 powder;

[0022] (2) Weigh 0.162g iron nitrate nonahydrate (Fe(NO) 3 9H 2 O) be dissolved in 20ml deionized water and be configured to contain 0.02mol / L Fe 3+ ion solution, and add step (1) gained K 2 Ti 4 o 9 Powder 1g, stirred for 24h, filtered and dried to obtain Fe-KTO material A;

[0023] (3) Take 0.1 g of the Fe-KTO material A obtained in step (2) and disperse it in 20 ml of methylene blue solution with a concentration of 20 mg / L, and then place the mixture under direct sunlight at 13-16 in fine weather for photocatalysis reaction.

Embodiment 2

[0025] This embodiment includes the following steps:

[0026] (1) Weigh titanium dioxide and potassium carbonate according to the ratio of Ti:K=2:1, mix and ball mill for 12 hours, heat in an air atmosphere at 1000°C for 1 hour, then disperse the product in dilute hydrochloric acid, wash and dry to obtain K 2 Ti 4 o 9 powder;

[0027] (2) Take 0.1g copper sulfate pentahydrate (CuSO 4 ·5H 2 O) be dissolved in 20ml deionized water and be configured to contain 0.02mol / L Cu 2+ ion solution, and add step (1) gained K 2 Ti 4 o 9 Powder 1g, stirred for 24h, filtered and dried to obtain Cu-KTO material B;

[0028] (3) Take 0.1g of the Cu-KTO material B obtained in step (2) and disperse it in 20ml of methylene blue solution with a concentration of 20mg / L, and then place the mixture under the direct sunlight of 13-16 in fine weather for photocatalysis reaction.

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Abstract

The invention relates to a preparation method for regulating and controlling a K2Ti4O9 band gap by using transition metal ions and photocatalytic application, and belongs to the field of photocatalytic degradation. The preparation method comprises the following steps: mixing TiO2 and K2CO3, carrying out ball milling, carrying out heating reaction in an air atmosphere, dispersing the product in diluted hydrochloric acid, washing, and drying to obtain K2Ti4O9 powder; dispersing K2Ti4O9 powder into a solution containing transition metal ions, stirring, and then filtering and drying to obtain the transition metal ion modified K2Ti4O9 photocatalytic material. A simple method is designed for introducing transition metal ions into K2Ti4O9 layers through ion exchange to regulate and control the optical band gap of the K2Ti4O9 so as to respond to visible light, thereby solving the problem of low utilization rate of the visible light of the K2Ti4O9. The method is simple, low in cost and remarkable in effect.

Description

technical field [0001] The invention relates to the field of photocatalytic degradation, in particular to a method of regulating K with transition metal ions 2 Ti 4 o 9 Preparation method of band gap and photocatalytic application. Background technique [0002] The process of industrialization has released a large amount of organic substances into the environment, such as antibiotics, dyes, etc., which have caused non-negligible pollution to the water environment. Among the many methods for treating organic pollutants, photocatalysis, as a green and environmentally friendly method, is also the most promising method for treating organic pollutants in water environments. TiO in titanium compounds 2 is the most widely studied photocatalyst, and its derivative K 2 Ti 4 o 9 (KTO) is also a non-toxic, low-cost layered compound. But its disadvantage lies in the relatively large optical band gap, K 2 Ti 4 o 9 The optical band gap is about 3.2-3.4eV, and it only responds t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C02F1/30C02F101/30C02F101/38
CPCB01J23/78C02F1/30C02F2101/308C02F2101/38C02F2305/10B01J35/39
Inventor 邓昭平马艳林吴宇航
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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