Titanate　nanotube　(TNT)　represents　one　class　of　novel　one-dimensional　semiconducting　nanomaterials　that　can　be　used　as　photocatalyst　for　given　applications.　However,　TNT　is　only　UV-light　photoactive　because　of　its　intrinsic　limitation　of　light　absorption　in　the　UV　region.　Here,　we　report　a　facile　approach　to　tune　the　optical　property　and　photocatalytic　performance　of　TNT　by　doping　various　metal　ions　(Cu2+,　Co2+,　Ni2+,　Fe2+,　and　Mn2+)　via　an　ion-exchange　method　in　an　aqueous　phase.　The　optical　properties　of　TNT　can　be　finely　tuned　by　incorporating　different　kinds　of　metal　ions　into　its　tubular　framework.　In　particular,　the　incorporation　of　metal　ions　into　the　matrix　of　TNT　is　able　to　extend　its　light　absorption　to　the　visible-light　region,　thus　making　TNT　have　the　visible-light　photoactivity.　Activity　testing　on　photocatalytic　selective　oxidation　of　a　variety　of　benzylic　and　allylic　alcohols　under　mild　conditions　demonstrates　that　these　metal-ion-doped　TNTs　exhibit　markedly　enhanced　catalytic　performance　as　compared　to　the　undoped　TNTs　under　both　the　irradiation　of　UV　light　and　visible　light.　Such　an　enhancement　of　photocatalytic　activity　with　regard　to　metal-ion-doped　TNT　is　primarily　attributed　to　the　prolonged　lifetime　of　photogenerated　electron　hole　pairs　in　comparison　with　that　of　undoped　TNT.　Our　current　research　work　demonstrates　the　tunable　optical　property　of　TNT　by　doping　metal　ions　and,　more　significantly,　opens　promising　prospects　of　one-dimensional　nanotubular　TNT　or　TNT-based　materials　as　visible-light-driven　photocatalyst　in　the　area　of　selective　transformation　using　molecular　oxygen　as　benign　oxidant　under　ambient　conditions.