The micro-nano Ag-TiO₂ composite film on the surface of wood substrate is fabricated using the hydrothermal synthesis and silver mirror method. The morphological feature, the crystal form, the chemical state and the optical properties of the as-prepared TiO 2/Agcoated wood are analyzed using the field emission scanning electron microscopy(FESEM), the X-ray diffraction(XRD), the transmission electron microscopy(TEM), the X-ray photoelectron spectroscopy(XPS) and the UV-vis diffusion reflectance spectroscopy(UV-vis). Meanwhile, it is shown that the TiO₂/Ag-coated wood has the property of formaldehyde degradation under the visible light irradiation. In this heterostructured system, due to the fact that the Fermi level of Ag is lower than the conduction band of TiO₂, the Ag nanoparticles can act as the electron scavenging centers to cause the electron and hole separation, leading to the enhanced photo-catalytic activity of TiO 2. In this paper, a new material for formaldehyde degradation is prepared, and the functional wood-based materials have great potential applications in new-style functional materials.

wood-based materials  /  Ag-TiO₂ composite film  /  photo-catalytic  /  gas formaldehyde  /  degradation under visible light irradiation