Abstract
▶ TiO 2 powders were prepared from acid treatments of BaTiO 3 . ▶ Characteristic voids were observed in rutile nanorods after calcination . ▶ Freeze-dried anatase particles assembled into a flake-like shape. ▶ With grafting Cu ions, rutile exhibited photocatalytic activity under visible light. The respective influences of calcination, drying methods, and washing conditions on the morphologies, surface properties, and photocatalytic activities of TiO 2 powders prepared from acid treatments of BaTiO 3 were investigated. Rutile powder was obtained using the treatment under strong acid conditions. It possesses a bundle-like shape and comprises rutile nanorods. After calcination, characteristic voids were observed in the particles. Anatase powder was obtained by adjusting pH values of a BaTiO 3 suspension to 2.5–3. Drying at 110 °C engendered the formation of spheroidal anatase, although freeze-dried anatase particles assembled into a flake-like shape. The freeze-dried samples show lower crystallinity. With grafting Cu ions, rutile exhibited better photocatalytic performance for the decomposition of gaseous 2-propanol (IPA) under visible light, although it did not work effectively for anatase.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
