Meso-porous ZnO nano-triangles @ g-C3N4 nano-foils (ZnO-nt@g-C3N4) was synthesized through a sono-chemical impregnation method. The photocatalytic activity was tested for the degradation of rhodamine-B (Rh-B) dye under simulated solar light irradiation. The concentration of g-C3N4 was found to be significant on the photocatalytic efficiency of ZnO-nt@g-C3N4. Compared to pure ZnO-nt and g-C3N4, the photocatalytic activity of ZnO-nt@g-C3N4 was greatly improved due to the synergistic effect. The photocatalyst of ZnO-nt@g-C3N4 (20%) exhibited 100% photocatalytic activity within 60 min. The recycling results also demonstrated that the photo-deactivation of ZnO-nt was completely arrested by g-C3N4 modification. A possible photocatalytic mechanism was proposed for the enhanced activity of ZnO-nt@g-C3N4. The outcome of this research work was also compared with previously reported catalysts. The results of this present work could be used for the application dye waste water treatment under solar light exposure. (C) 2015 Elsevier B.V. All rights reserved.