Preparation of novel hetero-nanostructures and high efficient visible light-active photocatalyst using incorporation of CNT as an electron-transfer channel into the support TiO2 and PbS

► Structure design of high efficient nanostructures as photo-active materials. ► B and Gap engineering of photo-active semiconductors of TiO2 and PbS using CNT. ► Fabrication and characterization of PbS- and TiO2-coated CNT hetero-nanostructures. ► Achieving a high photo-oxidation degradation (∼100%) of pollutant in just 20 and 30 min UV and visible light irradiation time, respectively.