A layered metal hydroxide composite catalytic material, its preparation method and application

By introducing carbon nanotubes as a support into layered metal hydroxides, iron, cobalt, and nickel metal hydroxides were loaded, solving the problems of low stability and activity of existing catalysts. This enabled the efficient degradation of iohexol in iodinated contrast agent wastewater. The preparation method is simple and environmentally friendly.

CN116688986BActive Publication Date: 2025-08-01NANJING NORMAL UNIVERSITY
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Patent Information

Application Number
CN202310537903.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-12
Publication Date
2025-08-01
Estimated Expiration
2043-05-12

AI Technical Summary

Technical Problem

Existing layered bimetallic hydroxide catalysts suffer from severe metal ion precipitation, poor stability, and low catalytic activity when treating iodinated contrast agent wastewater, making it difficult to efficiently activate persulfate to degrade organic pollutants.

Method used

Layered metal hydroxide composite catalytic materials were prepared by solvothermal synthesis using carbon nanotubes as carriers to load iron, cobalt, and nickel metal hydroxides. The carbon nanotubes served as conductive channels interspersed within the layered metal hydroxides, enhancing the stability and catalytic activity of the materials.

Benefits of technology

It improves the stability and catalytic activity of the catalytic material, achieves efficient activation of persulfate, enhances the degradation rate of iodinated contrast agents, and has a simple, green and environmentally friendly preparation method, making it suitable for industrial applications.

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Abstract

The present invention discloses a layered metal hydroxide composite catalytic material, its preparation method and application. The composite catalytic material comprises a carrier carbon nanotube and a metal hydroxide loaded on the carbon nanotube, and the metal is iron, cobalt and nickel. Preparation method: (1) Dissolve nickel salt, cobalt salt, iron salt and urea in an alcohol solution, stir evenly, then add carbon nanotubes, and continue to stir evenly to obtain a mixed solution; (2) Carry out a solvothermal synthesis reaction on the mixed solution obtained in step (1), filter, wash and dry after the reaction is completed to obtain the layered metal hydroxide composite catalytic material. The carbon nanotubes are introduced into the layered metal hydroxide in this composite catalytic material, reducing the precipitation of metal ions, avoiding the aggregation of hydroxides, improving the stability and catalytic activity of the catalytic material, and being used for activating persulfate to degrade organic pollutants, realizing the efficient activation of persulfate so as to improve the degradation rate of pollutants.
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