Preparation and photocatalytic activity of sol-gel method derived La doped TiO_2/ITO photocatalytic electrodes

摘要

La-doped TiO_2 thin films were synthesized using TTIP, IPA, Acetic acid, and La_2O_3 as precursors by sol-gel method and dip-coating method. The different molar raitos of La/Ti (0.025,0.050,0.075 and 0.100) were supported on ITO glass to product photocatalytic electrodes. The properties of both TiO_2/ITO and La- TiO_2/ITO photocatalytic electrodes were characterized by FE-SEM, BET and XRD. The FE-SEM and BET analytical results demonstrate that La-TiO_2/ITO particles have uniform shape and small size (＜10nm) compared with TiO_2/ITO. Anotherway, the XRD resultes show that when more molar raitos of La/Ti the crystallites become more percent to of rutile. The La-TiO_2/ITO photocatalytic electrode with molar raito 0.05 shows the best photocatalysis with mineralization rate after four hours reaction. On this condition, different Acid Yellow 17 initial concentration and UV light intensity have been research. Applied potential 2.0V would effectively increase the decolonization rate under visible light irradiation.