Preparation method of carbon nitride/zinc titanate/titanium oxide sandwich-like direct Z-shaped heterojunction composite photocatalyst

A zinc titanate and sandwich technology, applied in the field of organic dye pollutants, to achieve the effects of low cost, enhanced absorption range and strength, and improved redox ability

Active Publication Date: 2018-02-23
铜陵博雅渡业新材料科技有限公司
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Problems solved by technology

And so far, there is no information about g-C 3 N 4 with ZnTiO 3 -TiO 2 Composite construction of photocatalyst research and public reports, therefore, we designed a pg-C 3 N 4 / ZnTiO 3 / TiO 2 Composite photocatalyst with a sandwich-like direct Z-type heterojunction structure, which significantly improves its performance for visible light photocatalytic degradation of organic dyes

Method used

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  • Preparation method of carbon nitride/zinc titanate/titanium oxide sandwich-like direct Z-shaped heterojunction composite photocatalyst
  • Preparation method of carbon nitride/zinc titanate/titanium oxide sandwich-like direct Z-shaped heterojunction composite photocatalyst
  • Preparation method of carbon nitride/zinc titanate/titanium oxide sandwich-like direct Z-shaped heterojunction composite photocatalyst

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Embodiment 1

[0023] A method for preparing a carbon nitride / zinc titanate / titanium oxide sandwich direct Z-type heterojunction composite photocatalyst. Firstly, 20 g of urea was dissolved in 30 mL of distilled water to make urea aqueous solution, then the urea aqueous solution was placed in an alumina crucible with a cover, and then placed in a rapid heating electric furnace to raise the temperature to 400 °C at 15 °C / min and keep it for 1 h. Then the temperature was raised to 500 °C at 15 °C / min and kept for 2 h, after natural cooling, it was ground and sieved to obtain pg-C 3 N 4 sample. Add a solution containing 1.5 mol of zinc nitrate to an absolute ethanol solution containing 1 mol of titanium tetrachloride, add ammonia water to adjust the pH to 9.6 while stirring, and then adjust the pH to 8.0 with hydrochloric acid to obtain ZnTiO 3 / TiO 2Precursor suspension, the suspension was placed in a stainless steel hydrothermal reaction kettle and kept at a filling degree of 80%, then tig...

Embodiment 2

[0025] A method for preparing a carbon nitride / zinc titanate / titanium oxide sandwich direct Z-type heterojunction composite photocatalyst. Firstly, 30 g of urea was dissolved in 30 mL of distilled water to make urea aqueous solution, then the urea aqueous solution was placed in an alumina crucible with a cover, and then placed in a rapid heating electric furnace to raise the temperature to 400 °C at 10 °C / min and keep it for 1 h. Then the temperature was raised to 550 °C at 10 °C / min and kept for 2 h, after natural cooling, it was ground and sieved to obtain pg-C 3 N 4 sample. Add a solution containing 2 mol of zinc nitrate to an absolute ethanol solution containing 1 mol of titanium tetrachloride, add ammonia water to adjust the pH to 9.4 while stirring, and then adjust the pH to 7.8 with hydrochloric acid to obtain ZnTiO 3 / TiO 2 Precursor suspension, the suspension was placed in a stainless steel hydrothermal reaction kettle and kept at a filling degree of 80%, then tigh...

Embodiment 3

[0027] A method for preparing a carbon nitride / zinc titanate / titanium oxide sandwich direct Z-type heterojunction composite photocatalyst. Firstly, 15 g of urea was dissolved in 30 mL of distilled water to make urea aqueous solution, then the urea aqueous solution was placed in an alumina crucible with a cover, and then placed in a rapid heating electric furnace to raise the temperature to 400 °C at 10 °C / min and keep it for 1 h. Then the temperature was raised to 450 °C at 10 °C / min and kept for 2 h, after natural cooling, it was ground and sieved to obtain pg-C 3 N 4 sample. Add a solution containing 2.5 mol of zinc nitrate to an absolute ethanol solution containing 1 mol of titanium tetrachloride, add ammonia water to adjust the pH to 9.2 while stirring, and then adjust the pH to 7.8 with hydrochloric acid to obtain ZnTiO 3 / TiO 2 Precursor suspension, the suspension was placed in a stainless steel hydrothermal reaction kettle and kept at a filling degree of 80%, then ti...

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Abstract

The invention discloses a preparation method of a carbon nitride / zinc titanate / titanium oxide sandwich-like direct Z-shaped heterojunction composite photocatalyst. The preparation method disclosed bythe invention is characterized in that urea, zinc nitrate and titanium tetrachloride are taken as raw materials, the carbon nitride / zinc titanate / titanium oxide composite photocatalyst is prepared byadopting a co-precipitation method combined with a hydrothermal method, and methylene blue, rhodamine B and other organic dyes are degraded by utilizing the photocatalyst under visible light irradiation. The carbon nitride / zinc titanate / titanium oxide composite photocatalyst prepared by the preparation method disclosed by the invention forms a sandwich-like direct Z-shaped heterojunction structure, and the catalytic degradation rate of the methylene blue and the rhodamine B by the carbon nitride / zinc titanate / titanium oxide composite photocatalyst under visible light is 15-20 times that of a bulk phase g-C3N4. The carbon nitride / zinc titanate / titanium oxide sandwich-like direct Z-shaped heterojunction composite photocatalyst has the characteristics of being low in equipment requirement, less in energy consumption, low in cost, low in pollution and excellent in photo-catalytic performance.

Description

technical field [0001] The invention belongs to the field of visible light photocatalytic degradation of organic dye pollutants in aqueous solution, in particular to a method for preparing a carbon nitride / zinc titanate / titanium oxide sandwich direct Z-type heterojunction composite photocatalyst. Background technique [0002] Problems such as energy shortage and environmental pollution brought along with the rapid economic development are unavoidable. Nowadays, the problem of water pollution is becoming more and more serious. Organic dyes account for a large proportion of water pollution. Traditional sewage treatment methods are inefficient and prone to re-pollution. Photocatalytic technology, which has developed rapidly in recent years, has the advantages of low energy consumption, mild reaction conditions, convenient operation, no secondary pollution, simple maintenance and low operating costs. TiO 2 As a commonly used photocatalyst, there are also many problems. For ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/30C02F101/30
CPCC02F1/30B01J23/002B01J27/24C02F2305/10C02F2101/308B01J35/00B01J35/30B01J35/39
Inventor 李喜宝熊杰黄军同冯志军
Owner 铜陵博雅渡业新材料科技有限公司
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