Photocatalyst taking barium stannate as carrier to load cadmium sulfide quantum dots as well as preparation method and application of photocatalyst

A technology of supported catalysts and photocatalysts, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of low catalyst activity, selectivity and stability, and achieve excellent visible light absorption capacity, method And the application is simple and easy, which is conducive to the effect of popularizing the application

Active Publication Date: 2021-12-03
FUZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The present invention is aimed at initial BaSnO 3 In view of the problems of low activity, selectivity and stability of perovskite semiconductor catalysts, CdS QDs with visible light response are supported on the catalyst, and visible light is introduced during the reaction process, thereby significantly improving its catalytic NO removal performance and enhancing Its selectivity and stability are improved, and the preparation method of the catalyst is simple and easy, which is conducive to popularization and application

Method used

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  • Photocatalyst taking barium stannate as carrier to load cadmium sulfide quantum dots as well as preparation method and application of photocatalyst
  • Photocatalyst taking barium stannate as carrier to load cadmium sulfide quantum dots as well as preparation method and application of photocatalyst
  • Photocatalyst taking barium stannate as carrier to load cadmium sulfide quantum dots as well as preparation method and application of photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 3wt% CdS QDs / BaSnO 3 Catalyst preparation

[0030] (1) In an oil bath, add 100 mL H 2 O solution and 60 mL H 2 o 2 Add 2.805 gSnCl to the mixed solution 4 ·5H 2 O and 2.091 g Ba(NO 3 ) 2 ·6H 2 O, stirred rapidly for 0.5 h, then added ammonia water to adjust the pH to 9-10, dried in an oven at 80 °C for 8 h after centrifugal washing, and then calcined in a muffle furnace at 500 °C for 4 h to obtain white BaSnO 3 carrier;

[0031] (2) In a three-necked flask, add 20 mL of H 2 O solution was added 0.228g CdCl 2 2.5H 2 O and 0.15 mL of MPA, and adjust the pH to 10-11 by adding 5 M NaOH solution dropwise. The air in the three-necked flask was then evacuated and replaced with argon (Ar). With rapid stirring, freshly prepared Na 2 S aqueous solution (0.24 g Na 2 S+20 mL H 2 O) Add to the mixture solution at room temperature. Subsequently, the reaction mixture was heated to 100 °C and then stirred for 0.5 h. After it was cooled, ethanol was added to separate ...

Embodiment 2

[0034] Catalyst Performance Evaluation

[0035] The performance evaluation of the catalyst was carried out in a self-designed miniature fixed-bed atmospheric continuous reaction device, which consisted of a gas distribution system, a miniature quartz reaction tube, a humidification system, a circulating condensation system, a temperature control display and a xenon lamp (420 nm < λ< 760 nm) composition. The micro-quartz reactor has a double-layer structure of square sleeves, and the inner tube filled with catalyst measures 20 mm × 20 mm × 0.5 mm. The outer layer of the quartz vessel is fed with circulating water to control the reaction temperature.

[0036] For the reaction of catalytic oxidation of NO, 0.4 g of a catalyst with a particle size of about 0.2-0.3 mm (60-80 mesh) was filled in a quartz reactor, and the reaction temperature was controlled at 25 °C with a circulating water bath. The concentration of NO in the reaction gas stream was 10 ppm, O 2 is 21.0vol %, and t...

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Abstract

The invention discloses a photocatalyst taking barium stannate as a carrier to load cadmium sulfide quantum dots as well as a preparation method and application of the photocatalyst, wherein the supported photocatalyst is prepared by loading synthesized CdS QDs with negative charges on a BaSnO3 perovskite semiconductor carrier with light absorption and positive charges through electrostatic self-assembly. Compared with BaSnO3, the CdS QDs / BaSnO3 catalyst has the advantage that the performance and the stability of removing NO through photocatalysis under the condition of visible light and the selectivity of NO3<-> are obviously improved. According to the present invention, the CdS QDs are loaded on the BaSnO3 carrier through an electrostatic self-assembly method, so that the preparation method is simple and easy to implement and is more beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the field of environmental protection and air purification reaction, and specifically relates to a photocatalyst using barium stannate as a carrier to load cadmium sulfide quantum dots and its preparation method and application. Efficient photocatalytic removal. Background technique [0002] Since the 1970s, environmental pollution has continued to worsen, such as acid rain, the greenhouse effect, the hole in the ozone layer, and water pollution. These are environmental problems that have seriously endangered the normal life and health of human beings. Among them, in my country's urban air pollution, the proportion of vehicle exhaust emissions has exceeded 70%. Since the birth of the first car in 1886, the highly developed logistics technology and transportation technology have brought convenience to human beings, and have become an indispensable means of transportation for human beings. According to incomplete statistics, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01D53/86B01D53/56
CPCB01J35/004B01J27/04B01D53/8628Y02C20/10
Inventor 戴文新宋昕杰江文杰付贤智员汝胜张子重
Owner FUZHOU UNIV
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