Method for preparing photocatalyst of platinum-carried cadmium sulfide

Abstract

A process for preparing the Pt-carried cadmium sulfide as photocatalyst used to prepare H2 includes such steps as thermal decomposition of cadmium acetate at 300-600 deg.C to obtain cadmium oxide, thermal sulfurizing at 200-400 deg.C to obtain cadmium sulfide and carrying Pt by optical reduction method. Its advantages are high activity to generate H2 and high stability for resisting surface oxidization and optical corrosion.

Description

technical field [0001] The invention belongs to the field of hydrogen energy preparation, and relates to a photocatalytic clean preparation technology of hydrogen energy, that is, a photocatalytic decomposition hydrogen production technology using water as a raw material under the condition of simulating the visible light of the sun. In particular, it relates to a preparation method of a platinum-loaded cadmium sulfide photocatalyst. The surface of the cadmium sulfide prepared by the method has a special nano-step shape, and the existence of the shape makes the cadmium sulfide visible light photocatalytic decomposition of water for hydrogen production after platinum loading. Greatly improved, with high photocatalytic hydrogen production activity and high stability. Background technique [0002] Insufficient supply of conventional primary energy, shortage of liquid fuels, serious pollution caused by the use of fossil energy, CO 2 The pressure of emis...

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Problems solved by technology

Although the preparation of hexagonal cadmium sulfide by liquid phase method at low temperature has been realized, the crystallinity is generally poor (see Chinese patents CN1504825, CN1556028)

[0012] From the elaboration of the above prior art, it can be seen that, on the one hand, the cadmium sulfide prepared by the traditional method mostly exists as a cubic phase with lower activity without high-temperature treatment, and the crystallinity is poor, and there may be a large amount of impurities; Although the crystallinity has been improved, it either requires cumbersome follow-up treatment to remove a large number of by-products produced by heat treatment, or the anti-oxidation ability in the air is deteriorated, which in turn leads to the intensification of photocorrosion in the process of photocatalytic hydrogen production

On the other hand, after years of research and exploration, although a large number of new visible light-responsive photocatalysts have been reported internationally, their activity is generally low.

Although the cadmium sulfide prepared by the traditional method has high activity, it is easily corroded by light, which limits its application in the field of photocatalytic hydrogen production.

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