Preparation method of photocatalyst

Abstract

The invention provides a preparation method of a photocatalyst. The method comprises the following steps that cinnamomum camphora leaves are washed, dried and pulverized into powder; the powder smaller than 200 meshes is taken for later use; plant leaf powder is added into water; oscillation is performed in a shaking table; filtering is performed to obtain plant extracting liquid; a silver nitrate water solution and a chloroauric acid water solution are prepared; gold and silver bi-metal nanoparticles are prepared by mainly using the cinnamomum camphora leaf extracting liquid as a protection agent and a reducing agent; the bi-metal nanoparticles are prepared by a substitution method and a coreduction method at normal temperature; the nanoparticles are loaded on a titanium dioxide carrier for degrading dye such as methyl orange, methylene blue and rhodamine B; the condition that the dye is basically and completely degraded within 1h is found. When the catalyst is subjected to ionic liquid extraction and roasting treatment, the catalytic activity can be shortened within 30 minutes, and is superior to the results reported in most literatures. In addition, the photocatalyst is sunk at the bottom of a container after being used; through simple solid-liquid separation and roasting treatment, the activity is not obviously lowered; good application prospects are realized.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a "green" preparation method of photocatalyst, which includes the preparation of bimetallic nanoparticles by plant reduction method and the preparation and pretreatment of bimetallic nanoparticle catalysts. Background technique [0002] Au-Ag bimetallic nanoparticles have unique catalytic properties, so their preparation has attracted the attention of many scientists. The addition of Ag to the bimetallic catalyst can promote the O 2 This is because the formation of the bimetallic structure promotes Au and Ag to have greater electron-donating capabilities, and the electrons can be transferred to oxygen molecules, weakening the oxygen-oxygen bond to form O 2 - , to promote the oxidation performance of the catalyst, and at the same time, the interaction of Au and Ag generated by the addition of Ag can prevent the agglomeration of the catalyst during pretreatment. At pre...

AI Technical Summary

Problems solved by technology

At present, the research on the preparation of monometallic nanoparticles by phytoreduction has been relatively mature, but the reduction rate of different metal nanoparticles by plant extracts is different. Researchers generally believe that it is difficult to prepare bimetallic nanoparticles by phytoreduction, and because Adsorption of plant molecules, catalytic activity of bimetallic nanoparticles is less than ideal

At present, the preparation of bimetallic nanoparticles by phytoreduction is still in the initial stage. For example, the Au-Pd bimetallic nanoparticles prepared by Zhan et al. (Materials letters, 2011, 65(19): 2989-2991) cannot be widely used.

[0004] So far, there is no report on the synthesis of Au-Ag bimetallic nanoparticle photocatalysts by using plant reduction method at home and abroad.

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