Applying the experimental statistical method to deal the preparatory conditions of nanometric-sized TiO2 powders from a two-emulsion process

✍ Scribed by Ching-Shieh Hsieh; Hong Zhu; Tsong-Yang Wei; Zen-Ja Chung; Wein-Duo Yang; Yin-Hsia Ling

• Book ID: 104022822
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 475 KB
• Volume: 28
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2007.10.002

✦ Synopsis

Nanometric-sized titanium oxide powders have been synthesized successfully through the two-emulsion method. It was found that the anatase phase is formed at 400 • C and converted to rutile phase as heat-treated at 700 • C. The synthesized TiO 2 powders exhibit particle sizes at 10-30 nm, in a specific surface area of about 30-88 m 2 /g. Furthermore, the surface response method (including Box-Behnken design) was applied to deal with the preparatory conditions of the two-emulsion process. It reveals that the optimal preparatory conditions were obtained at the volume ratio of surfactant/n-hexane = 0.03, volume ratio of water/oil = 0.04, molar ratio of acetylacetone/titanium isopropoxide = 4, molar ratio of isopropanol/titanium isopropoxide = 23.1. By combining the optimal settings of those variables, a nanometric-sized TiO 2 powder has been obtained with specific surface area of 96 m 2 /g. It demonstrates the photocatalytic degradation of methylene blue solution effectively by exposing the as-synthesized TiO 2 powders in aqueous solution under ultraviolet light.