Modified carbon black supported nickel-gold bimetallic nanocatalyst and preparation method thereof

Abstract

The invention discloses a nickel-gold bimetal nanocatalyst supported by modified carbon black and a preparation method thereof. The catalyst comprises modified carbon black, nano nickel and nano gold particles, and the nano nickel and nano gold particles are jointly loaded on the modified Carbon black surface; Modified carbon black is obtained by modifying carbon black with concentrated nitric acid. The preparation method comprises: preparing a modified carbon black-supported single-metal nickel nano-catalyst; and loading nano-gold particles on the modified carbon black-supported single-metal nickel nano-catalyst. The catalyst of the present invention has the advantages of good economic benefits, good stability, high catalytic activity, good reusability, and easy recycling, and is an economical bimetallic nano-catalyst, which can efficiently degrade and remove organic pollutants in the environment, especially can The highly toxic nitro aromatic hydrocarbons are reduced to the corresponding low-toxic amines. The preparation method has the advantages of wide source of raw materials, low cost, and no need for special equipment. It is suitable for large-scale preparation and is beneficial to industrial production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, relates to a nickel-gold bimetallic nanocatalyst and a preparation method thereof, in particular to a nickel-gold bimetallic nanocatalyst supported by modified carbon black and a preparation method thereof. Background technique [0002] Nano-gold and nano-nickel, as two important nanomaterials, have the advantages of wide application, easy synthesis, large specific surface area, biocompatibility, non-toxicity, etc. Their unique dielectric properties and excellent catalytic effect make them widely used in medicine. , chemistry, environment and other fields. In particular, both of them can reduce nitroaromatic hydrocarbons. By reducing highly toxic nitroaromatic hydrocarbons to corresponding amines under the action of catalysts, on the one hand, the toxicity of nitroaromatic hydrocarbons is reduced, thereby reducing its toxicity. Pollution to the environment; on the other hand, these ...

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Problems solved by technology

[0003] Nano-sized colloidal gold has a good catalytic effect and can quickly reduce specific nitroaromatics, and the catalytic activity is further enhanced with the decrease of its particle size, but the smaller the particle size, the smaller the colloidal gold is due to the size effect. As a result, the surface energy is greater, and the surface of colloidal gold is easily affected by the outside world and plasmon resonance occurs, which makes it very easy to precipitate

Due to the larger particle size and fewer active sites of the precipitated colloidal gold, the catalytic activity decreases. At the same time, colloidal gold nanoparticles exist in the solution, which cannot be recycled and reused well, thus easily causing waste of resources.

At the same time, the raw materials for the preparation of nano gold are expensive, which is not in line with the development of green economy

Nickel is abundant in the earth's crust, and the price is relatively low, and nano-nickel is magnetic, which is conducive to separation from the solution, but its catalytic activity is poor, and a large amount of nickel is needed to achieve satisfactory catalytic activity

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