Conjugated polymer nanostructures (CPNs) emerge as a new class of photocatalysts for organic pollutant degradation under UV and visible light. Polypyrrole (PPy), as a conjugated polymer, exhibits a wide range of applications. We present here the first illustration of employing pure PPy nanostructures as a very efficient photocatalyst for the depollution of water. PPy was synthesized in soft template by chemical polymerization (PPy-c), obtained by radiolysis (PPy-γ), and synthesized without template via chemical method (PPy-b) as bulk. Among these three samples, PPy-c shows the best photocatalytic performance under UV light, while PPy-γ exhibits the highest activity for phenol degradation under visible light. These samples have been characterized by different techniques: SEM, TEM, NanoIR, FTIR, UV-Vis spectroscopy. We modified PPy nanostructures with co-catalysts based on Pt and Ni nanoparticles for H2 production. The modified PPy nanostructures give also promising results for hydrogen generation under ultraviolet light. The effect of the nature of the metal precursors and their concentrations were studied.