Catalytic ozonation of 2-methylisoborneol by fluorine doped ceramics

To address the issue of tap water safety caused by the seasonal increase in odor, a novel fluorine-doped ceramic has been prepared and employed in catalytic ozonation for the removal of 2-methylisoborneol (2-MIB), a typical odorant compound in tap water. Fluorine was incorporated into the ceramic framework through the solid-phase addition of CaF 2 , leading to the concurrent formation of Lewis acid sites (LAS) and oxygen vacancies (OVs). These sites substantially promote the generation of reactive oxygen species (ROS). The optimal catalyst doped with 1.0 wt% CaF 2 exhibits an appropriate pore structure and the highest density of acid sites, enabling the complete removal of 2-MIB (100 ng/L) within 6 min during the catalytic ozonation process. This catalytic ozonation, in which the singlet oxygen ( 1 O 2 ) and superoxide radicals (·O 2 − ) dominate the oxidative degradation of 2-MIB, exhibits an approximately 4-fold higher reaction rate constant than ozonation. This work demonstrates that catalytic ozonation using a CaF 2 -doped ceramic catalyst is a highly feasible and efficient method for 2-MIB removal, offering a promising strategy for odor control in tap water.