Compound type semiconductor photocatalyst and preparation method thereof as well as photocatalytic system and hydrogen production method

Abstract

The invention discloses a compound type semiconductor photocatalyst based on graphene, CdS nano crystal and cheap metal and a preparation method of the compound type semiconductor photocatalyst as well as a photocatalytic system and a method for preparing hydrogen. According to the compound type semiconductor photocatalyst, a cheap inorganic salt is used as a precursor in the presence of a biomass and a derivative thereof and cobalt, nickel, iron or manganese metal is loaded on a graphene-CdS compound in situ by a photic driving method to prepare the ternary compound type semiconductor photocatalyst based on the graphene, the CdS nano crystal and the cheap metal; meanwhile, the biomass and the derivative of the biomass are reformed to generate the hydrogen. The compound catalyst loaded with the cheap metal is prepared by adopting an in-situ illumination method and the catalytic hydrogen production efficiency is obviously improved; the graphene is introduced so that the catalyst is efficient. The catalytic system has the advantages of visible light response, simple equipment and convenience in operation; the catalyst is stable and cheap; a preparation process does not need to take noble metal materials including platinum, rhodium and the like as catalyst promoters.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a composite semiconductor photocatalyst and a graphene-based composite semiconductor photocatalyst, a preparation method thereof, a photocatalytic system containing the catalyst and a method for preparing hydrogen. Background technique [0002] Energy is the basis for human survival. At present, fossil fuels, the main energy used by humans, are facing the crisis of being exhausted, and their exploitation and utilization have brought many environmental problems, which is not conducive to sustainable development. Hydrogen has gradually attracted attention as a clean and renewable energy. Using solar energy to split water to produce hydrogen is one of the most ideal ways to solve the energy crisis faced by mankind. [0003] The research on photo-splitting water by semiconductor nanocrystals (ie, semiconductor nanocrystal materials) has made great progress in the past thirty years...

AI Technical Summary

Problems solved by technology

[0004] At present, most hydrogen production systems have the following problems: using noble metals as cocatalysts, the reaction cost is high; the catalyst preparation process is complicated and the conditions are harsh, such as high temperature or calcination, etc., the required experimental equipment is high; the catalytic activity of the catalyst is still relatively low

[0005] So far, there is no literature report on the preparation of cheap metal-supported composite catalysts and graphene composite catalysts by in situ light irradiation at room temperature.

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