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Preparation of Pd-loaded La-doped TiO sub(2) nanotubes and investigation of their photocatalytic activity under visible light
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Preparation of Pd-loaded La-doped TiO sub(2) nanotubes and investigation of their photocatalytic activity under visible light
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Journal Article
Preparation of Pd-loaded La-doped TiO sub(2) nanotubes and investigation of their photocatalytic activity under visible light
2013
Overview
Orthorhombic titanic acid nanotubes (TAN) have large BET surface area and small-diameter one-dimensional nanotubular morphology, so they can work as a good supporter and a precursor of TiO sub(2). However, in our former research, we found that calcination of TAN to anatase TiO sub(2) would destroy the nanotubular structure and decrease the BET surface area sharply. In this work, we utilized the pillar effect of the foreign nanoparticles (La sub(2)O sub(3)) to keep the nanotubular morphology of TiO sub(2), and obtained the anatase TiO sub(2) nanotubes with large BET surface area. For improving the photocatalytic activity, Pd nanoparticles were loaded as the electron traps on the surface of La-doped TiO sub(2) by photo-deposition method. The photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, diffuse reflectance spectra, and N sub(2) adsorption-desorption isotherms measurement. Their photocatalytic activities were evaluated by the removal of propylene under visible light irradiation ( lambda greater than or equal to 420 nm). The results showed that the photocatalytic activity of Pd-loaded La-doped TiO sub(2) nanotubes improved effectively compared with that of La-doped TiO sub(2) and pure TiO sub(2).
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