Photocatalytic properties of N-doped TiO2 porous sphere

Abstract

TiO₂ photocatalytic microspheres were prepared by heat-treatment at 500°C by sol-gel method using porous organic polymer microspheres as templates. These were N-doped by heat-treatment at 450∼550°C in NH₃ atmosphere. From the measurements of the decomposition rates of pentachlorophenol by N-doped and -undoped TiO₂ spheres, the photocatalytic activity of the fibers N-doped at 500∼550°C was superior to that of the N-undoped under either visible or ultra-violet light irradiations.