The synthesis and coating process of TiO2 nanoparticles using CVD process

A chemical vapor deposition (CVD) process with T-junction apparatus was used to coat a TiO2 photocatalyst onto a glass bead. The amount of coating was controlled using the coating time. The coated bead catalysts were characterized using various techniques, such as scanning electron microscopy, Brunauer–Emmett–Teller, X-ray diffraction and X-ray photoelectron spectroscopy. The CVD technique was compared with the dip coating method using the commercial catalyst, P-25. The CVD-coated bead had a comparatively uniform and regular surface, while the dip-coated bead showed a partly un-coated surface. Additionally, the catalytic activity was investigated using the TiO2 coated beads as the photocatalyst in the decomposition of acetaldehyde. The result showed that a 60-min sample coating time gave the best photocatalytic activity.

A chemical vapor deposition (CVD) process with T-junction apparatus was used to coat a TiO2 photocatalyst onto a glass bead. The CVD-coated bead had a comparatively uniform and regular surface, while the dip-coated bead showed a partly un-coated surface. The catalytic activity of CVD-coated beads for the decomposition of acetaldehyde was higher than that of the dip-coated bead. Especially, a 60-min sample coating time gave the best photocatalytic activity.Figure optionsDownload as PowerPoint slideHighlights
► A chemical vapor deposition (CVD) process with T-junction apparatus was used to coat a anatase TiO2 photocatalyst onto a glass bead.
► The CVD-coated bead with the around 20–30 nm mean size of the deposited particle had a comparatively uniform and regular surface than dip-coated bead.
► The catalytic activity of CVD-coated bead for acetaldehyde decomposition was higher than that of dip-coated bead.