A tubular furnace Carbolite Eurotherm CTF 12165/550 with a quartz sample holder was used for the synthesis of bone char sam- ples. Samples of bone char were synthetized at specific conditions of heating rate, pyrolysis temperature and thermal treatment time, which were defined using a full factorial design Ak, see Table 1. For pyrolysis process, nitrogen gas (400 mL/min) was used to provide an inert atmosphere during the synthesis of bone char. All syn- thetized bone char samples were washed with deionized water until obtaining a constant pH and dried for their use in fluoride adsorption experiments.