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Methylene blue adsorption value and iodine adsorption value are two different indicators to measure the performance of activated carbon, each reflecting different characteristics of activated carbon.

The methylene blue adsorption value is mainly used to characterize the decolorization ability of activated carbon. The molecular diameter of methylene blue is larger than that of iodine molecules, so the methylene blue value is usually used to represent the number of mesopores in activated carbon, which is crucial for the decolorization process. The higher the methylene blue value, the stronger the decolorization ability of activated carbon is usually, which means that the decolorization effect is better at the same unit weight. ‌Iodine adsorption value is mainly used to characterize the adsorption ability of activated carbon for small molecules, especially for micropores with a diameter of less than 1.0nm. The diameter of iodine molecules is only 0.335nm, so the iodine value reflects the degree of development of activated carbon micropores, which is very important for the adsorption of small molecular impurities. The higher the iodine value, the stronger the adsorption capacity of activated carbon, and the more effectively it can remove impurities such as organic matter, residual chlorine, heavy metal ions in water, and harmful gases in the air.

In short, the methylene blue adsorption value and the iodine adsorption value measure the performance of activated carbon from different perspectives. The former is more related to the decolorization ability, while the latter is related to the adsorption ability of small molecules. Although the two indicators are different, they are both important parameters for evaluating the performance of activated carbon. Choose the appropriate indicator for evaluation according to the specific application scenario.