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2D-WS₂ incorporated polyaniline nanocomposites (WS₂-PANI) with varying WS₂ loadings were synthesized by a facile in situ oxidative polymerization technique which effectively promoted photocatalytic waste-water remediation using methylene blue (MB) as the probe molecules. The physicochemical properties of WS₂-PANI (1–5) nanocomposites were investigated using multifarious techniques such as FT-IR, XRD, BET surface area, TGA, FESEM, and HRTEM. An electron microscopy analysis that was performed using HRTEM analysis confirm the layered structure of WS₂ with periodic planes (100) separated by 0.27 nm. The photocatalytic performance of the WS₂-PANI (1–5) for MB degradation performed under UV photo irradiation clearly showed that 2 wt.% WS₂-PANI outperformed other variants with 93% degradation MB within 90 min. Furthermore, the catalytic material was reusable for five cycles without a significant loss of the catalytic performance.