Photocatalytic monoliths with hieratical pores ranging from nm to µm, consisting of titanate nanotubes (TNTs), SrTiO₃ nanoparticles, and TiO₂ nanoparticles, are prepared by a hydrothermal reaction of a porous TNT/TiO₂ monolith with Sr(OH)₂. The precursory TNT/TiO₂ monolith is composed of TNTs and TiO₂ (anatase) nanoparticles where the frameworks of the monolith are constructed from interconnected and entangled TNTs. The SrTiO₃ nanoparticles are found to be homogeneously formed on the TNTs. Close contact between SrTiO₃ nanoparticles and TNTs in the porous monolith is considered to benefit an enhancement of photocatalytic activity due to an effective suppression of the electron–hole recombination at the heterojunction.