A kind of photocatalytic composite material and its preparation method and application

Abstract

The invention provides a preparation method of photocatalytic composite materials and relates to the technical field of catalysts. The preparation method provided by the invention includes the following steps: (1) soaking plant leaves to obtain template biomass; (2) mixing the molybdenum source-sulfur source aqueous solution with the template biomass obtained in step (1) After impregnation, a composite material precursor is obtained; (3) the composite material precursor obtained in step (2) is calcined to obtain a photocatalytic composite material. The photocatalytic composite material of the present invention includes acicular molybdenum sulfide and biomass carbon. The acicular molybdenum sulfide is loaded on the surface of the sheet biomass carbon; the mass content of the biomass carbon is 70% to 90%, and the mass content of the molybdenum sulfide is It is 10%~30%. The photocatalytic hydrogen production performance of the photocatalytic composite material of the present invention is better than that of pure molybdenum sulfide material, and has excellent photocorrosion resistance. After three cycles, the hydrogen production efficiency only decreases by about 10%.

Description

Technical field [0001] The invention relates to the technical field of catalysts, in particular to a photocatalytic composite material and a preparation method and application thereof. Background technique [0002] Hydrogen production by electrolysis of water is the most common hydrogen production method, but it has many disadvantages. First, the solid polymer electrolyte membrane is the core part of the electrolysis of water for hydrogen production. At present, the development of domestic solid polymer electrolyte membranes is limited and depends on a few foreign companies, so the cost of hydrogen production is relatively high. Second, the membrane used as a catalyst has a limited service life and low repeated utilization rate. Third, in the actual operation process, a large amount of electric energy needs to be consumed. [0003] In the field of photolysis of water for hydrogen production, currently commonly used catalysts are pure semiconductor oxides, such as cerium oxide and...

AI Technical Summary

Problems solved by technology

First, the solid polymer electrolyte membrane is the core part of hydrogen production by electrolysis of water. However, the development of domestic solid polymer electrolyte membranes is limited and depends on a few foreign companies, so the cost of hydrogen production is relatively high.

Second, as a catalyst film, its service life is limited and its repeated utilization rate is low

Third, in the actual operation process, it needs to consume a lot of power, etc.

[0003] In the field of photolysis of water to produce hydrogen, currently commonly used catalysts are pure semiconductor oxides, such as ceria and titanium dioxide, which have a band gap of about 3.2eV and can only perform photocatalytic reactions in the ultraviolet region of sunlight. In addition, the ultraviolet light part only accounts for about 4% in the solar spectrum, and the utilization rate of sunlight is low.

Transition metal sulfide semiconductor materials can directly respond to visible light, but transition metal sulfide semiconductor materials have obvious photocorrosion effects, and the separation ability of photogenerated electron-hole pairs needs to be improved, which limits the use of transition metal sulfide semiconductor materials in light. Applications in the field of catalysis

Images