Titanium　acid　H2Ti2O5　center　dot　H2O　with　nanosheet　morphology　has　been　prepared　by　doping　Zn2+　into　Ti-O　crystal　structure　through　the　hydrothermal　method.　The　products　were　characterized　by　X-ray　diffraction　(XRD),　X-ray　photoelectron　spectroscope　(XPS),　transmission　electron　microscopy　(TEM),　and　ultraviolet-visible　(UV-vis)　spectroscopy.　It　indicated　that　Zn2+　doping　plays　an　important　role　in　formation　of　layered　H2Ti2O5　center　dot　H2O.　The　photo-catalytic　activity　of　the　samples　was　characterized　by　the　depigmentation　of　methyl　orange　solution　by　UV　light　irradiation.　It　demonstrated　that　H2Ti2O5　center　dot　H2O　possess　good　photocatalytic　properties　in　water　purification　and　may　find　potential　application　in　related　fields.　(c)　2005　Elsevier　B.V.　All　rights　reserved.