The adsorption properties of activated carbon can be analyzed and characterized by different methods, including methylene blue adsorption value, benzene adsorption amount, carbon tetrachloride adsorption rate, iodine value, coke decolorization rate, etc.
The pore structure and specific surface area of activated carbon are usually described by nitrogen adsorption isotherm at low temperature. According to the classification standards of the international society of pure and applied chemistry, the pore size is the main parameter for the characterization of the pore structure of activated carbon, which can be divided into micropore < 2.0nm, mesopore 2-50nm, and macropore >50nm.
1. Pore size distribution;
2. Shape of micropores (straight cylinder, ink bottle, V shape, cone shape, etc.);
3. Microporous state (open hole, closed hole);
4. The amount of ash impurities in the hole, etc.