Method for prolonging service life of CdS nano photocatalyst

A nano-photocatalyst, life-span technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve problems such as easy photocorrosion and reduced photocatalytic lifespan

Inactive Publication Date: 2015-09-23
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cadmium sulfide also has some inherent disadvantages. For example, Zhang, J, Davis, A.P. et al. found that CdS is prone to photocorrosion during the photocatalytic process, which greatly reduces its photocatalytic life.

Method used

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  • Method for prolonging service life of CdS nano photocatalyst
  • Method for prolonging service life of CdS nano photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Prepare 10 ml of aqueous solution with 0.025 mol of cadmium acetate, 0.075 mol of thiourea, 0.005 mol of sodium dodecylbenzenesulfonate and 0.2 mol of ammonia water. Prepare the precursor with 0.002mol CdS and 40ml deionized water. Pour the two into a 50mL polytetrafluoroethylene sleeve and mix thoroughly; put the mixed solution and the polytetrafluoroethylene sleeve into a 50ml stainless steel hydrothermal reaction kettle, then put the hydrothermal reaction kettle into an oven and heat to 120°C. Keep for 2 hours, then cool naturally; centrifuge the suspension obtained after the reaction, and ultrasonically clean the solid substance obtained after centrifugation with deionized water, repeating 5 times; dry the solid substance obtained after cleaning at a temperature of 70°C After 12 hours, the nanometer cadmium sulfide powder was obtained; the cadmium sulfide powder obtained by hydrothermal synthesis was sent into the atomic layer deposition vacuum chamber, and the a...

Embodiment 2

[0021] 1) Prepare 10 ml of aqueous solution with 0.025 mol of cadmium acetate, 0.075 mol of thiourea, 0.005 mol of sodium dodecylbenzenesulfonate and 0.2 mol of ammonia water. Prepare the precursor with 0.002mol CdS and 40ml deionized water. Pour the two into a 50ml polytetrafluoroethylene sleeve and mix thoroughly; put the mixed solution and the polytetrafluoroethylene sleeve into a 50ml stainless steel hydrothermal reaction kettle, then put the hydrothermal reaction kettle into an oven and heat to 120°C. Keep for 2 hours, then cool naturally; centrifuge the suspension obtained after the reaction, and ultrasonically clean the solid substance obtained after centrifugation with deionized water, repeating 5 times; dry the solid substance obtained after cleaning at a temperature of 70°C After 12 hours, the nanometer cadmium sulfide powder was obtained; the cadmium sulfide powder obtained by hydrothermal synthesis was sent into the atomic layer deposition vacuum chamber, and the a...

Embodiment 3

[0023]1) Prepare 10 ml of aqueous solution with 0.025 mol of cadmium acetate, 0.075 mol of thiourea, 0.005 mol of sodium dodecylbenzenesulfonate and 0.2 mol of ammonia water. Prepare the precursor with 0.002mol CdS and 40ml deionized water. Pour the two into a 50ml polytetrafluoroethylene sleeve and mix thoroughly; put the mixed solution and the polytetrafluoroethylene sleeve into a 50ml stainless steel hydrothermal reaction kettle, then put the hydrothermal reaction kettle into an oven and heat to 120°C. Keep for 2 hours, then cool naturally; centrifuge the suspension obtained after the reaction, and ultrasonically clean the solid substance obtained after centrifugation with deionized water, repeating 5 times; dry the solid substance obtained after cleaning at a temperature of 70°C After 12 hours, the nanometer cadmium sulfide powder was obtained; the cadmium sulfide powder obtained by hydrothermal synthesis was sent into the atomic layer deposition vacuum chamber, and the at...

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Abstract

The invention provides a method for prolonging the service life of a CdS nano photocatalyst. The method is characterized by depositing a layer of 1-10 A as protective layer (TiO2, ZnO, Al2O3, AZO, and the like) on the surface of a CdS nano particle synthesized hydrothermally by virtue of an atomic layer deposition technique. On the premise of guaranteeing relatively a high catalytic efficiency, light corrosion occurrence is effectively reduced, and therefore the service life CdS nano photocatalyst is prolonged from 1 hour to over 18 hour. The preparation method effectively reduces the harm to the light CdS nano particle and prolongs the catalyst life of the CdS nano particle.

Description

technical field [0001] The invention relates to a method for prolonging the service life of a CdS nanometer photocatalyst. Background technique [0002] Nano-semiconductor photocatalyst is a nano-scale semiconductor catalyst, which is usually prepared by various physical or chemical methods from some narrow-bandgap oxides or sulfides. Its advantage is that it does not require additional energy and only needs to absorb sunlight It can realize photocatalysis, decompose water to generate hydrogen and decompose organic matter in wastewater, effectively solving the environmental and energy problems currently faced by human beings. [0003] At present, the most widely studied nano-semiconductor catalyst is TiO with a scale of about 25nm. 2 (P25), but due to TiO 2 The bandgap width of the catalyst is 3.2eV, which means that it can only absorb about 5% of the solar spectrum in the ultraviolet band, which greatly reduces its catalytic efficiency. People doped TiO with various meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C01B3/04C02F1/30C02F101/30
CPCY02E60/36Y02W10/37
Inventor 王卫超刘晖董红解新建刘孟寅
Owner NANKAI UNIV
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