CdS/ZnO composite piezoelectric photocatalyst and preparation method and application thereof

Abstract

The invention discloses a CdS / ZnO composite piezoelectric photocatalyst and a preparation method and application thereof. The method comprises the steps that firstly, a ZnO nanorod is synthesized through a solvothermal method, and then a chemical bath is carried out to synthesize the CdS / ZnO composite piezoelectric photocatalyst by taking the ZnO nanorod as a precursor through the action of electrostatic adsorption. The catalyst is a piezoelectric photocatalyst formed by compounding CdS and ZnO which have piezoelectric properties, the catalyst utilizes a piezoelectric electric field to promotethe separation of photo-generated carriers for enhancing the photocatalytic activity, the interior and space separation of the photo-generated carriers is also achieved, thereby reducing the recombination of the photo-generated carriers and increasing the utilization rate of the solar energy, and the piezoelectric photocatalytic rate reaches 5.477 min<-1>, which is four times of the photocatalytic efficiency of CdS alone. The CdS / ZnO composite piezoelectric photocatalyst and the preparation method and application thereof have the advantages that the raw materials are easy to obtain, the preparation method is simple, the operation is convenient, the stability of the composite material is better, and a feasible strategy is provided for improving the photocatalytic performance.

Description

technical field

[0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a CdS / ZnO composite piezoelectric photocatalyst and its preparation method and application. Background technique

[0002] With the development of economy and society, people's demand for energy is increasing and their requirements for the environment are getting higher and higher. Photocatalytic technology can convert low-density solar energy into high-density chemical energy, and can decompose pollutants in the environment, which has strategic significance in solving energy and the environment. However, the rapid recombination of photogenerated carriers severely limits its applications and becomes a bottleneck in this field. In recent years, researchers have improved carrier utilization by loading co-catalysts and constructing heterojunctions. These methods have promoted the spatial separation of carriers to a certain extent. However...

Examples

Embodiment 1

[0019] Add 20mL of 0.5M KOH alcohol solution dropwise to 10mL of 0.1M Zn(CH 3 CH 2 COO) 2 2H 2 O solution, after magnetic stirring for 30 min, the reaction solution was transferred to a 50ml polytetrafluoroethylene reactor, and reacted at 150°C for 24h. Cool to room temperature, centrifuge the sample, wash the sample with deionized water and ethanol, and dry it at 60 ° C for 12 hours to obtain ZnO nanorods.

Embodiment 2

[0021] Disperse 100 mg of ZnO nanorods in 40 mL of deionized water, add 96.5 mg of C 10 h 12 CdN 2 Na 2 o 8 ·XH 2 O, stirred magnetically for 30 min, and added 82.8 mg of C to the above solution at 80 °C 3 h 6 N 2 S, react at 80°C for 30min. Naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol for several times, and vacuum-dried at 60° C. for 12 hours to obtain the CdS / ZnO composite.

Embodiment 3

[0023] Disperse 100 mg of ZnO nanorods in 40 mL of deionized aqueous solution, add 289.5 mg of C 10 h12 CdN 2 Na 2 o 8 ·XH 2 O, stirred magnetically for 30 min, and added 248.4 mg of C to the above solution at 80 °C 3 h 6 N 2 S, react at 80°C for 30min. Naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol for several times, and vacuum-dried at 60° C. for 12 hours to obtain the CdS / ZnO composite.

technical field

[0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a CdS / ZnO composite piezoelectric photocatalyst and its preparation method and application. Background technique

[0002] With the development of economy and society, people's demand for energy is increasing and their requirements for the environment are getting higher and higher. Photocatalytic technology can convert low-density solar energy into high-density chemical energy, and can decompose pollutants in the environment, which has strategic significance in solving energy and the environment. However, the rapid recombination of photogenerated carriers severely limits its applications and becomes a bottleneck in this field. In recent years, researchers have improved carrier utilization by loading co-catalysts and constructing heterojunctions. These methods have promoted the spatial separation of carriers to a certain extent. However...

Examples

Embodiment 1

[0019] Add 20mL of 0.5M KOH alcohol solution dropwise to 10mL of 0.1M Zn(CH 3 CH 2 COO) 2 2H 2 O solution, after magnetic stirring for 30 min, the reaction solution was transferred to a 50ml polytetrafluoroethylene reactor, and reacted at 150°C for 24h. Cool to room temperature, centrifuge the sample, wash the sample with deionized water and ethanol, and dry it at 60 ° C for 12 hours to obtain ZnO nanorods.

Embodiment 2

[0021] Disperse 100 mg of ZnO nanorods in 40 mL of deionized water, add 96.5 mg of C 10 h 12 CdN 2 Na 2 o 8 ·XH 2 O, stirred magnetically for 30 min, and added 82.8 mg of C to the above solution at 80 °C 3 h 6 N 2 S, react at 80°C for 30min. Naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol for several times, and vacuum-dried at 60° C. for 12 hours to obtain the CdS / ZnO composite.

Embodiment 3

[0023] Disperse 100 mg of ZnO nanorods in 40 mL of deionized aqueous solution, add 289.5 mg of C 10 h12 CdN 2 Na 2 o 8 ·XH 2 O, stirred magnetically for 30 min, and added 248.4 mg of C to the above solution at 80 °C 3 h 6 N 2 S, react at 80°C for 30min. Naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol for several times, and vacuum-dried at 60° C. for 12 hours to obtain the CdS / ZnO composite.

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