Normal-temperature ion exchange preparation method for silver tungstate photocatalyst

A photocatalyst, ion exchange technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. high consumption problem

Inactive Publication Date: 2018-12-18
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, laser instruments are expensive and energy-

Method used

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  • Normal-temperature ion exchange preparation method for silver tungstate photocatalyst
  • Normal-temperature ion exchange preparation method for silver tungstate photocatalyst
  • Normal-temperature ion exchange preparation method for silver tungstate photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 0.25 mmol Na 2 WO 4 Was dissolved in 20.0 mL of deionized water to form a solution, and then 20.0 mL of AgNO 3 The solution (1 mmol) was slowly added dropwise to the above solution and stirred for 0.5 hour. Finally, the product was collected by centrifugation, washed with deionized water and absolute ethanol for several times, and then dried at 60°C to obtain AWO-1:0.25 photocatalyst.

Embodiment 2

[0021] Weigh 0.5 mmol Na 2 WO 4 Was dissolved in 20.0 mL of deionized water to form a solution, and then 20.0 mL of AgNO 3 The solution (1 mmol) was slowly added dropwise to the above solution and stirred for 1.0 hour. Finally, the product was collected by centrifugation, washed with deionized water and absolute ethanol for several times, and then dried at 60°C to obtain AWO-1:0.5 photocatalyst.

Embodiment 3

[0023] Weigh 4.0 mmol Na 2 WO 4 Was dissolved in 20.0 mL of deionized water to form a solution, and then 20.0 mL of AgNO 3 The solution (1 mmol) was slowly added dropwise to the above solution and stirred for 1.5 hours. Finally, the product was collected by centrifugation, washed several times with deionized water and absolute ethanol, and then dried at 60°C to obtain the AWO-1:4 photocatalyst.

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Abstract

The invention discloses a normal-temperature ion exchange preparation method for an Ag2WO4 photocatalyst. According to the invention, AgNO3 is used as a salt source; the dual effects that Na2WO4 can provide both WO4<2-> ions and generate alkaline OH<-> thorugh hydrolysis are ingeniously utilized; and the crystal phase purity, morphology, microstructure and photocatalytic activity of an Ag2WO4 sample are changed by adjusting a raw material molar ratio of AgNO3 to Na2WO4. Results show that compared with a sample with a raw material ratio of an iso-stoichiometric ratio, the product with a AgNO3-to-Na2WO4 molar ratio in a range of 1: 0.25 to 1: 5 is obviously improved in the performance of photocatalytic degradation of organic pollutants; the Ag2WO4 photocatalyst has optimal photocatalysis performance when a stoichiometric ratio of 1: 4; and the pseudo first-order kinetic speed constant k of the Ag2WO4 photocatalyst is 21.8 times higher than the pseudo first-order kinetic speed constant kof the sample with the raw material ratio of the iso-stoichiometric ratio. The results of mechanism analysis show that the light absorption range of the Ag2WO4 nanorod cluster is red-shifted, which indicates that the utilization of solar energy is increased; and at the same time, fluorescence intensity is decreased, which indicates that the separation efficiency of carriers is improved.

Description

Technical field [0001] The invention belongs to the technical field of water pollution protection, relates to industrial wastewater treatment technology, and more specifically is a high-performance Ag 2 WO 4 (Silver tungstate) Photocatalyst ion exchange preparation method. Background technique [0002] In recent years, toxic organic pollutants in the environment, such as industrial dyes and phenols, pose a serious threat to the ecosystem and human health. Compared with the traditional electrochemical degradation, biodegradation and adsorption methods, semiconductor photocatalysis technology has received extensive attention from scientific researchers due to its advantages such as convenient operation, use of solar energy, high efficiency, and environmental friendliness. The key and challenging factor of this technology is to explore photocatalysts with visible light response and high degradation efficiency. [0003] Among various semiconductors, the silver-containing composite oxi...

Claims

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Application Information

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IPC IPC(8): B01J23/68C02F1/30C02F101/30C02F103/30
CPCB01J23/687B01J35/004C02F1/30C02F2101/308C02F2103/30
Inventor 张国英王冰玉邢春艳
Owner TIANJIN NORMAL UNIVERSITY
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