Abstract:This study investigates the absorption performance and mechanism of amine-functionalized mesoporous silica (AFPS) materials for uranium (VI) in water. Eight AFPS materials with varying pore sizes and amino functional groups (APTES and AEPTES) were synthesized to assess their absorption effects on uranium (VI) under different pH conditions. The experimental findings reveal that AFPS exhibits the highest absorption efficiency for uranium (VI) at a pH of approximately 5.5. Aperture analysis indicates that the optimal pore size for the AEPTES functional group is 4.1 nm, whereas for the APTES functional group, being 2.7 nm. Investigation into the adsorption mechanism suggests that amine groups effectively adsorb uranium (VI) by binding with hydroxyl groups (OH-) on the surface of hydrated uranyl groups. This study provides a scientific basis for understanding the mechanism of AFPS absorption of uranium (VI) and offers theoretical support and research direction for developing new and efficient absorption materials.