PURPOSE: To obtain a fluorine disposing agent having a large fluorine saturated adsorption and effectively removing fluorine in waste water, by allowing a solid adsorbent to carry a specific compound.

CONSTITUTION: As a fluorine disposing agent, a solid adsorbent such as activated carbon is made to carry a compound shown by a general formula R1R2R3 SiX (wherein R1WR3 are each H or alkyl and two or more of them are different or the same alkyl groups, X is Cl, Br, OH or a group hydrolyzable into OH such as an alkoxy group). The obtained disposing agent has a large fluorine saturated adsorption so that it adsorbs and removes fluorine in waste water effectively.