摘要： The challenges like the removal of organic pollutants from the wastewater, and photocatalytic reduction of N2 using solar energy are achievable by stable, low cost, and a visible light active semiconductor mediated photocatalysis. A novel 0.4BWO/g-C3N4 heterostructure achieves excellent degradation of cationic/anionic dyes and N2 reduction under visible light illumination. The 0.4BWO/g-C3N4 exhibits 99.8% degradation efficiency towards the degradation of rhodamine B (RhB), which is 2.2-fold compared to commercial catalyst Degussa P25. 0.4BWO/g-C3N4 composite also efficiently degraded AV7, IC, DB 71 dyes and photo-reduce N2 to NH3. The incorporation of BWO nano-octahedron into the g-C3N4 network suppress the recombination of photogenerated electron-hole pairs and follow Z-scheme electron transfer pathway in 0.4BWO/g-C3N4 heterostructure. The notable separation of electron-hole pairs is well described by photoluminescence, time-resolved fluorescence, and impedance spectroscopy study. The finding presented here provides new insight into typical design and engineering of a stable and visible light active heterostructure for degradation of dyes and N2 reduction.