Photocatalytic composite material as well as preparation method and application thereof

Abstract

The invention provides a preparation method of a photocatalytic composite material, and relates to the technical field of catalysts. The preparation method comprises the following steps: (1) carryingout soaking pretreatment on plant leaves, thus obtaining template biomass; (2) mixing a molybdenum source-sulfur source water solution with the template biomass obtained in step (1), and immersing, thus obtaining a composite material precursor; (3) calcining the composite material precursor obtained in step (2), thus obtaining the photocatalytic composite material. The photocatalytic composite material is prepared from needle-like molybdenum sulfide and biomass carbon, wherein the needle-like molybdenum sulfide is loaded on the surface of the flaky biomass carbon; the content of the biomass carbon is 70 to 90 percent, and the content of the molybdenum sulfide is 10 to 30 percent. The photocatalytic hydrogen production performance of the photocatalytic composite material prepared by the invention is superior to that of a pure molybdenum sulfide material, excellent photocorrosion resistance is obtained, and the hydrogen production efficiency is just reduced by about 10 percent after circulating for thrice.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a photocatalytic composite material and its preparation method and application. 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 hydrogen production by electrolysis of water. However, the current 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 thin film catalyst, its service life is limited and its repeated utilization rate is low. Third, in the actual operation process, a large amount of electric energy needs to be consumed. [0003] In the field of photolysis of water to produce hydrogen, currently commonly used catalysts are pure semiconductor oxides, such as ceria and titanium...

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

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