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Astrakova T.V.,Kemerovo Technological Institute of the Food Industry
Catalysis in Industry | Year: 2012

The paper describes the possibility of improving the pore structure and adsorption properties of industrial active carbons (AC) by means of their modification with e-caprolactam (CL). Application of ε- caprolactam (a product of large-scale organic synthesis) as a modifying substance allows the targeted regula- tion of the specific surface area and volume of AC mesopores, while the conditions of modification change the chemical composition of the surface of carbon adsorbents and, as a result, their adsorption properties. The process of modification includes three stages. The first is the adsorption of CL from aqueous solution and heating at 300°C in the presence of atmospheric oxygen. The second is carbonization in an argon flow at 900°C, and the third is the vapor-gas activation of the resultant adsorbents at 900°C. Each stage is followed by determining the parameters of the pore structure by N 2 adsorption and the adsorption parameters with respect to benzene, iodine, aqueous solutions of ε-caprolactam, and copper sulfate (CuSO4). When modify- ing the carbonized samples with an initial ε-caprolactam content of 2%, we observe the growth of mesopores over 100% of volume, relative to AG-OV-1 original industrial activated carbon. Depending on the stage of modification, an increase in adsorption is observed, relative to the AG-OV-1 original carbon: benzene adsorption rises by 50%, the adsorption of iodine from aqueous solution rises by 20%, the adsorption of e- caprolactam from aqueous solution grows by more than 30%, and the adsorption of copper(II) ions rises by more than 70%. The procedure for the production of the described modified adsorbent has no rivals abroad; it is protected by a patent and can be used in industry. It is possible to use inexpensive industrial carbons as the original material. The procedure allows the production of carbon adsorbents with predetermined struc- tural and adsorption properties. © Pleiades Publishing, Ltd., 2012. Source

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