Abstract: In the presence of the chitosan template, reduction with silver deposited TiO_2 nanoparticles were prepared via reduction with NaBH_4. The Ag/TiO_2 nanoparticles were characterized by TEM, XRD, FT-IR, and UV-Vis. The results showed that chitosan accession to the silver reduction reaction can be controlled easily;Nano-Ag/TiO_2 shaped in the square for most particles and the red-shift was observed clearly in the UV-Vis adsorption spectrum. The photocatalytic activity of the as-prepared Ag/TiO_2 nanopowders is satisfactory, which was confirmed by organic photodegradating tests under the sun light. In the absence of sunlight, the as-prepared Ag/TiO_2 has good anti-bacterial effect.

Key words: chitosan template;Ag/TiO_2 nanoparticles;photocatalysis;antibacterial