The　nanocomposites　of　Ag-AgBr-TiO2　photocatalyst　have　been　prepared　by　a　simple　deposition-precipitation　method,　which　is　used　for　the　gas-phase　degradation　of　volatile　organic　pollutants　of　aromatic　benzene　and　non-aromatic　acetone　that　are　notorious　volatile　organic　compounds　(VOCs)　present　in　indoor　and　outdoor　air.　A　collection　of　joint　techniques,　including　X-ray　diffraction　(XRD),　transmission　electron　microscopy　(TEM)　and　ultraviolet/visible　diffuse　reflectance　spectra　(UV/vis　DRS)　have　been　employed　to　determine　the　structure,　morphology　and　optical　properties　of　the　as-prepared　Ag-AgBr-TiO2　nanocomposite.　The　presence　of　surface　Ag　species　existed　as　Ag　(O)　and　Ag　(I)　in　Ag-AgBr-TiO2　is　confirmed　by　the　analysis　of　X-ray　photoelectron　spectroscopy　(XPS).　The　Fourier　transformed　infrared　spectroscopy　(FT-IR)　analysis　shows　the　enhanced　chemical　bonding　of　O-Ti　and　O-Ti-O　after　the　deposition　of　AgBr　and　Ag　species　onto　the　surface　of　TiO2.　It　is　found　that　the　Ag-AgBr-TiO2　nanocomposite　exhibits　much　higher　photocatalytic　activity　and　stability　under　both　UV　light　and　visible　light　irradiation　as　compared　with　that　over　commercial　titania　(Degussa　P25)　toward　the　gas-phase　degradation　of　both　aromatic　benzene　and　non-aromatic　acetone.　The　active　radical　species　involved　for　degradation　reactions　over　the　Ag-AgBr-TiO2　photocatalyst　have　been　investigated　by　the　spin-trapping　electron　paramagnetic　resonance　(EPR)　spectra　and　the　center　dot　OH-trapping　photoluminescence　(PL)　spectra.　Synergetic　effects　between　Ag-AgBr　and　TiO2　have　been　observed　and　discussed　for　the　gas-phase　degradation　of　volatile　organic　compounds　on　the　basis　of　joint　results　of　characterization　and　photocatalytic　activity.　(C)　2011　Elsevier　B.V.　All　rights　reserved.