CN-117696090-B - Nitrogen-doped carbon polyhedron-sulfide composite photocatalyst and preparation method and application thereof

Abstract

The invention discloses a nitrogen-doped carbon polyhedron-sulfide composite photocatalyst, and a preparation method and application thereof, wherein the preparation process is as follows: adding the nitrogen-doped carbon polyhedral non-metal cocatalyst powder into deionized water, adding cadmium acetate after ultrasonic treatment, stirring, adding NaOH aqueous solution, adding thioacetamide, uniformly stirring, and performing hydrothermal reaction at 160-200 ℃ for 16-24 hours to obtain the nitrogen-doped carbon polyhedral-sulfide composite photocatalyst. In the NCP@CdS composite photocatalyst prepared by the method, a nitrogen-doped carbon skeleton in NCP provides an electron transfer channel and an active site required by reaction, so that effective charge separation and migration from CdS to NCP are realized. Compared with original CdS, the NCP@CdS composite photocatalyst provided by the invention has more excellent visible light catalytic hydrogen production performance under different sacrificial agent systems.

Inventors

• GUAN XIANGJIU
• GAO ZE
• ZHANG TUO
• GUO LIEJIN

Assignees

• 西安交通大学

Dates

Publication Date

20260512

Application Date

20231209

Claims (4)

1. 1. The application of the nitrogen-doped carbon polyhedron-cadmium sulfide composite photocatalyst in photocatalytic hydrogen production under visible light is characterized in that the preparation method of the nitrogen-doped carbon polyhedron-cadmium sulfide composite photocatalyst comprises the following steps: Adding nitrogen-doped carbon polyhedron nonmetallic promoter powder into deionized water, adding cadmium acetate after ultrasonic treatment, stirring, adding NaOH aqueous solution, adding thioacetamide, uniformly stirring, and carrying out hydrothermal reaction at 160-200 ℃ for 16-24 hours to obtain a nitrogen-doped carbon polyhedron-sulfide composite photocatalyst; The dosage ratio of the nitrogen-doped carbon polyhedral non-metal promoter powder to deionized water is 86.7mg:50mL, the dosage ratio of cadmium acetate to deionized water is 20mmol:50mL, the dosage ratio of cadmium acetate to NaOH aqueous solution is 20mmol:10mL, and the dosage ratio of cadmium acetate to thioacetamide is 20:25; The nitrogen-doped carbon polyhedral non-metal cocatalyst is prepared by the following steps: calcining ZIF-8 powder at 800-1100 ℃ for 4-6 hours, then adding the calcined ZIF-8 powder into hydrochloric acid solution, uniformly drying to obtain the nitrogen-doped carbon polyhedral nonmetallic cocatalyst.
2. 2. The application of the nitrogen-doped carbon polyhedron-cadmium sulfide composite photocatalyst in photocatalytic hydrogen production under visible light, which is characterized in that the ultrasonic time is 15-30 minutes.
3. 3. The application of the nitrogen-doped carbon polyhedron-cadmium sulfide composite photocatalyst in photocatalytic hydrogen production under visible light, which is characterized in that the concentration of NaOH aqueous solution is 4mol/L.
4. 4. The application of the nitrogen-doped carbon polyhedron-cadmium sulfide composite photocatalyst in photocatalytic hydrogen production under visible light, which is characterized in that the dosage ratio of ZIF-8 powder to hydrochloric acid solution is 400mg-600mg:200mL-400mL, the concentration of the hydrochloric acid solution is 2mol/L, and the temperature is raised to 800-1100 ℃ at a temperature raising rate of 3 ℃ per minute.

Description

Nitrogen-doped carbon polyhedron-sulfide composite photocatalyst and preparation method and application thereof Technical Field The invention belongs to the field of hydrogen energy preparation, relates to a photocatalysis clean preparation technology of hydrogen energy, and in particular relates to a nitrogen-doped carbon polyhedron-sulfide composite photocatalyst, and a preparation method and application thereof. Background The use of fossil fuels in large quantities is causing global energy shortages and environmental pollution. Hydrogen is a promising energy carrier, the source and the reaction product of which can be water, which can well solve the problems caused by fossil energy sources, and is being studied and applied more and more widely. Among the numerous hydrogen production processes, the use of solar energy to produce hydrogen has been a potential candidate and research hotspot. However, the problems of low utilization rate of photo-generated carriers, low surface chemical reaction speed and the like exist in the photocatalysis process, and the development of solar hydrogen production is greatly limited. Therefore, research and development of useful photocatalytic materials for rapid carrier transfer separation are considered to be viable methods for achieving commercial hydrogen production. Wherein, the supported promoter is an attractive strategy for inhibiting the recombination of the photo-generated carrier, and can obviously improve the reactivity of the photocatalyst. Most of the prior photocatalysis systems are metal-based cocatalysts, which have the problem of high cost and are easy to damage the environment in the development and utilization process. Among them, noble metals such as Pt, pd, ru and Rh have excellent catalytic performance, but their high cost and low abundance limit further widespread use of these noble metals. In addition, noble metal-free cocatalysts such as MoS 2、NiS2、CoP、W2N3 and transition metals have also been widely studied for their good electrical conductivity. However, the metal still has influence on the environment in the exploitation process, which is unfavorable for treating global environmental pollution. Therefore, it is important to develop a novel non-metal promoter to achieve high levels of nuisance free hydrogen production. Disclosure of Invention The invention aims to provide a nitrogen-doped carbon polyhedron-sulfide composite photocatalyst, and a preparation method and application thereof, so as to realize efficient photocatalytic preparation of green clean energy. In order to achieve the above purpose, the present invention adopts the following technical scheme: the preparation method of the nitrogen-doped carbon polyhedral-sulfide composite photocatalyst comprises the following steps: Adding the nitrogen-doped carbon polyhedral non-metal cocatalyst powder into deionized water, adding cadmium acetate after ultrasonic treatment, stirring, adding NaOH aqueous solution, adding thioacetamide, uniformly stirring, and performing hydrothermal reaction at 160-200 ℃ for 16-24 hours to obtain the nitrogen-doped carbon polyhedral-sulfide composite photocatalyst. Further, the dosage of the nitrogen-doped carbon polyhedral non-metal promoter is 1 to 6 percent of the theoretical mass of CdS. Further, the time of the ultrasonic treatment is 15-30 minutes. Further, the dosage ratio of cadmium acetate to deionized water was 20mmol to 50mL. Further, the dosage ratio of the cadmium acetate to the NaOH aqueous solution is 20 mmol/10 mL, and the concentration of the NaOH aqueous solution is 4mol/L. Further, the ratio of the amount of cadmium acetate to the amount of thioacetamide is 20:25. Further, the nitrogen-doped carbon polyhedral non-metal promoter is prepared by the following process: calcining ZIF-8 powder at 800-1100 ℃ for 4-6 hours, then adding the calcined ZIF-8 powder into hydrochloric acid solution, uniformly drying to obtain the nitrogen-doped carbon polyhedral nonmetallic cocatalyst. Further, the dosage ratio of ZIF-8 powder to hydrochloric acid solution is 400mg-600mg:200mL-400mL, the concentration of hydrochloric acid solution is 2mol/L, and the temperature is raised to 800-1100 ℃ at the temperature raising rate of 3 ℃/min. A nitrogen-doped carbon polyhedral-sulfide composite photocatalyst prepared according to the method described above. The application of the nitrogen-doped carbon polyhedron-sulfide composite photocatalyst in photocatalytic hydrogen production under visible light. Further, adding the nitrogen-doped carbon polyhedron-sulfide composite photocatalyst into a reactor, adding a sacrificial agent, blowing argon, and stirring to perform photocatalytic hydrogen production reaction, wherein the sacrificial agent is a mixed solution of 0.25mol/L Na 2SO3 aqueous solution and 0.35mol/L Na 2 S aqueous solution, a 10% volume fraction triethanolamine aqueous solution or a 10mmol/L benzyl alcohol aqueous solution. Further, the dosage ratio of the ni