Hydrophilic TiO₂ porous spheres anchored on hydrophobic polypropylene membrane for wettability induced high photodegrading activities

TiO₂ porous nanospheres on polypropylene (PP) films (TiO ₂/PP composite) are produced at ambient temperature. Particle/pore size match up is the key anchoring point to overcome the low affinity between hydrophilic materials and hydrophobic materials. With the hydrophilic TiO ₂ catalyst evenly dispersed on a hydrophobic surface, the aqueous solution will selectively skip the substrate and wet the catalysts. Such a wettability-induced smart system maximizes the degrading activity of the TiO₂ catalyst. In photodegrading reactions, the resulting TiO ₂/PP composite film exhibits a 10 times higher activity in flow-type setup than the same TiO₂ catalyst in a traditional batch-type setup.