Abstract Investigate the use of visible light to improve photocatalytic degradation of organic pollutants in wastewater. Nitrogen-doped titania and molybdenum sulfide nanocomposites (NTM NCs) with different weight ratios of MoS 2 (1, 2, and 3 wt.%) synthesized by a solid state method applied to the photodegradation of methylene blue(MB) under visible light irradiation. The synthesized NTM composites were characterized by SEM, TEM, XRD, FT-IR, UV–Vis, DRS and PL spectroscopy. The results showed enhanced activity of NTM hybrid nanocrystals in oxidizing MB in water under visible light irradiation compared to pure TiO 2 . The photocatalytic performance of NTM samples increased with MoS 2 content. The results show that the photodegradation efficiency of the TiO 2 compound improved from 13 to 82% in the presence of N-TiO 2 and to 99% in the presence of MoS 2 containing N-TiO 2 , which is 7.61 times higher than that of TiO 2 . Optical characterization results show enhanced nanocomposite absorption in the visible region with long lifetimes between e/h+ at optimal N-TiO 2 /MoS 2 (NTM 2 ) ratio. Reusable experiments indicated that the prepared NTM NCs photocatalysts were stable during MB photodegradation and had practical applications for environmental remediation.