Hydrothermal synthesis of titanium dioxides using acidic and basic peptizing agents and their photocatalytic activity on the decomposition of orange II

Abstract

TiO 2 nanoparticles were prepared using the hydrolysis of titanium tetraisopropoxide (TTIP) using HNO 3 and TENOH as peptizing agents in the hydrothermal method. The photocatalytic degradation of orange II has been studied using a batch reactor in the presence of UV light. When the molar ratio of HNO 3 /TTIP is 1.0, the rutile phase appeared on the titania and the photocatalytic activity decreased with an increase of HNO 3 concentration. However, no rutile phase was shown even though the molar ratio of TENOH/TTIP increased up to 1.0. The titania particle prepared at TENOH/TTIP molar ratio=0.1 shows the highest activity on the photocatalytic decomposition of orange ILand the photocatalytic activity decreases according to an increase in TENOH/TTIP molar ratio.