Capture of carbon dioxide from flue gases by amine-functionalized TiO2 nanotubes

► TiO2 nanotubes were synthesized via hydrothermal treatment. ► The novel CO2 adsorbents were prepared through impregnating the as-synthesized TiO2 nanotubes with four kinds of amines. ► CO2 capture was investigated in a dynamic packed column. ► TiO2 nanotubes impregnated by TEPA show superior adsorption capacity and excellent CO2 adsorption/desorption performance. ► The synthesis way of the adsorbents not only saves energy but also is environmentally friendly.