Why carbon black and coke do not have adsorption properties

Carbon black and coke are both carbon materials, but their adsorption properties differ greatly. Carbon black has strong adsorption capacity and can be used to prepare various adsorbents, while coke has almost no adsorption capacity. Why is this?
We need to understand the basic principle of adsorption. Adsorption refers to the phenomenon where a substance adheres to a solid surface due to the chemical or physical properties of the surface and the interaction forces between the substances when they come into contact with the solid surface. Adsorption can be divided into two types: physical adsorption and chemical adsorption. Physical adsorption refers to the Van der Waals force, electrostatic force and other physical forces between the substance and the solid surface, while chemical adsorption refers to the Chemical bond between the substance and the solid surface.
The adsorption properties of carbon black and coke are different, mainly due to their different surface properties. The surface of carbon black contains rich active functional groups, such as hydroxyl, carboxyl, phenolic, etc. These functional groups can undergo chemical reactions or physical adsorption with various substances, thus exhibiting strong adsorption properties. The surface of coke is relatively simple, mainly composed of carbon atoms, without abundant functional groups, thus having almost no adsorption.
In addition, the preparation methods of carbon black and coke also affect their surface and adsorption properties. Carbon black is usually prepared by pyrolysis of organic matter. During the pyrolysis process, a large number of gas and liquid by-products are generated, which form pores and functional groups on the surface of carbon black, thereby increasing its surface area and activity. Coke, on the other hand, is prepared by high-temperature calcination of coal or coke. During the calcination process, impurities and functional groups in the coal or coke are removed, making the surface of the coke relatively simple and almost devoid of adsorption.
The difference in adsorption properties between carbon black and coke is mainly due to their different surface properties. Carbon black has rich functional groups and pore structures, a large surface area, and therefore has strong adsorption properties; However, coke has a relatively simple surface and almost no adsorption. This difference is not only related to the properties of the material itself, but also to the preparation method.

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