Halloysite-TiO2 nanocomposites: Synthesis, characterization and photocatalytic activity

► Halloysite-TiO2 nanocomposites were prepared under hydrothermal treatment at 180 °C. ► The nanocomposites showed significantly higher activity in decomposing NOx gas compared to P25. ► Composite photocatalyst showed larger catalytic activity in decomposing toluene compared to the P25.