A crystalline rutile titanium oxide (TiO2)-dispersed porous glass-ceramic was successfully prepared by the phase separation of aluminosilicate-based glass. A rutile TiO2 crystal was clearly observed after the heat treatment of 20TiO(2)center dot 29SiO(2)center dot 13Al(2)O(3)center dot 28CaO center dot 5MgO center dot 2P(2)O(5)center dot 2B(2)O(3)center dot 1ZrO(2) (mol%) glass at 900 degrees C for 15 h. The glass-ceramic obtained was then treated with an acid solution (3 mol/dm(3) nitric acid) to leach its soluble phases. The acid-treated sample became porous, and the glass-ceramic obtained had a large surface area of 74 m(2)/g. The porous glass-ceramic adsorbed methylene blue (MB) rapidly, and the adsorbed MB was photodecomposed by ultraviolet irradiation.