Preparation and photocatalytic performance of ultrafine titanium dioxide powder
RUAN Ji-feng LI Chun-xi WANG Zi-hao(College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China)
Nano-sized titanium dioxide particles were prepared by continuously introducing dilute ammonia gas to hydrolyze titanium tetrachloride acidic solution. Effects of several influencing factors such as temperature, titanium concentration, final pH value, amount of dispersing agent and the reaction time, on the particle sizes, particle aggregation and photocatalytic performances were investigated experimentally. The photodegradation experiments of phenol aqueous solution by titanium dioxide dispersion under UV-irradiation were carried out to justify the optimum preparation conditions. It was found that the non-crystal titanium dioxide hydrate also shows a good photocatalytic performance.