P-doped TiO2 nanoparticles film coated on ground glass substrate and the repeated photodegradation of dye under solar light irradiation

► Loading of photocatalyst. ► P-doped TiO2 nanoparticles coating on ground glass. ► Recycle of photocatalyst. ► A compact TiO2 film showed high photacatalytic reaction efficiency in the degradation of dye.