This study explores the photocatalytic performance of novel N and Fe dual-doped, one-dimensional TiO2 nanotube structures (N-Fe-TNTs) for the degradation of a-pinene and toluene under visible-light illumination. N-Fe-TNTs were synthesized using a combination of sonochemical-hydrothermal-impregnation processes. N-Fe-TNT hybrids showed higher photocatalytic efficiency compared to pure TNT, N-doped TNT, and Fe-doped TNT. Specifically, the average decomposition efficiencies for a-pinene and toluene over N-Fe-TNT-1.0 were 94.6% and 88.7%, respectively. Moreover, the photocatalytic efficiency of the N-Fe-TNT hybrids improved as the Fe loading was increased gradually from 0.35% to 1.0%, though a further increase in Fe loadings led to reduced photocatalytic efficiency. The mineralization efficiencies of a-pinene and toluene were 43.2% and 47.7%, respectively. Gaseous intermediates were determined during the photocatalytic processes. Overall, the synthesized N-Fe-TNTs could be used efficiently to decompose a-pinene and toluene under visible-light exposure. (C) 2017 Elsevier Ltd. All rights reserved.