Influence of infill geometry on the degradation performance of 3D printed TiO2 photocatalytic filters

In this study, TiO 2 filters with complex geometries (i.e., grid, honeycomb and gyroid) were 3D printed via direct ink writing (DIW), sintered at 1350°C, coated using a sol-gel method and treated at 600°C to induce the formation of anatase-phase TiO 2 . The sintered TiO 2 filters exhibited a relative density between 92.19 % and 94.81%, with shrinkage ranging from 19% to 22%. XRD and SEM analyses confirmed the formation of the anatase phase and a uniform coating with a thickness of 4.3-4.5 μm on the TiO 2 filters. The surface-engineered TiO 2 filters were evaluated for the photocatalytic degradation of Rhodamine B under UV light. Among the tested structures, the gyroid geometry exhibited the highest performance (completely degrading Rhodamine B in 200 minutes) due to its higher surface area.