Different types of desiccant dehumidifiers function in different ways, but the primary procedure they use to extract dampness from the air is both absorption or adsorption. Absorption takes place when the desiccant material dissolves as it's going to take moisture from the air, as is the situation with dampness absorbers. https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/