Developing　photocatalysts　with　superior　efficiency　and　selectivity　is　an　important　issue　for　photocatalytic　converting　CO2.　Hierarchically　heterostructured　one-dimensional　nanomaterials　represent　a　kind　of　promising　catalysts　for　photocatalytic　CO2　reduction　on　account　of　the　high　surface　area　and　synthetic　effect　between　different　components.　Herein,　we　synthesized　UIO-66-NH2/carbon　nanotubes　(CNTs)　heterostructures　via　a　hydrothermal　method,　and　investigated　their　photocatalytic　performance.　The　element　mapping,　X-ray　diffraction,　and　X-ray　photoelectron　spectroscopy　collectively　confirmed　that　the　UIO-66-NH2　was　successfully　loaded　on　the　surface　of　the　CNTs.　The　specific　surface　area　of　the　UIO-66-NH2/CNTs　is　1.5　times　higher　than　that　of　UIO-66-NH2.　The　photocurrent　and　electrochemical　impedance　spectroscopy　measurements　showed　that　the　CNTs　could　enhance　the　electron　mobility　and　reduce　the　recombination　of　photogenerated　electron-hole　pairs,　which　was　also　confirmed　by　the　Photoluminescence　spectroscopy　(PL).　The　CNTs　can　improve　the　conductivity　of　composites　and　the　dispersion　of　UIO-66-NH2,　exposing　more　active　sites,　therefore　the　UIO-66-NH2　can　increase　the　absorption　of　carbon　dioxide　and　thus　enhance　the　selectivity.　The　composites　remarkably　promoted　the　separation　and　transition　of　electrons　and　thus　improved　the　photocatalytic　efficiency　of　CO2　reduction.　More　importantly,　it　was　found　that　the　as-prepared　composites　suppress　the　hydrogen　generation　reaction　during　the　CO2　reduction　process.　©　2020　Hydrogen　Energy　Publications　LLC