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What do the activated carbon indicators iodine value and methylene blue represent?

09,Dec 2024

Iodine value and methylene blue are important indicators for measuring the adsorption capacity of activated carbon.

Iodine value refers to the amount of iodine adsorbed by activated carbon in 0.02N12/KL aqueous solution. Iodine value is associated with the surface area of ​​pores with a diameter greater than 10A, and can be understood as an indicator of total pore volume. The higher the iodine adsorption value of honeycomb activated carbon, the longer it can be used. Generally speaking, the higher the iodine value, the stronger the adsorption capacity of activated carbon, especially for small molecular impurities.

Methylene blue value refers to the number of milligrams of methylene blue absorbed when 1.0 gram of carbon reaches equilibrium with a methylene blue solution with a concentration of 1.0 mg/L. Methylene blue is a dark blue dye, and its adsorption capacity reflects the ability of activated carbon to adsorb molecular substances. This value is higher for activated carbon with a large number of micropores. Methylene blue value is mainly used in liquid phase adsorption of activated carbon to characterize the number of pores in activated carbon.

                     

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