Herein, the photocatalytic activity of g-C₃N₄/BiOBr (CB) heterojunction in the oxidative C–N coupling of benzylamine under atmospheric air using cool white LED light was reported for the first time. The CB heterojunction was prepared by two-step combustion-coprecipitation method. By tuning the weight percentage of g-C₃N₄, the optimal catalyst containing 10.2 wt% of g-C₃N₄ provided the highest benzylamine conversion of ca. 94 % and the best N-benzylidenebenzylamine yield of ca. 82% within 4 h irradiation. The influences of catalyst amount, substrate concentration, light intensity and reaction temperature on photocatalytic performance were also discussed. The CB catalyst also successfully oxidized N-heterocyclic amine and secondary amine into their corresponding imines which extends the scope and potential use of this catalyst in the syntheses of other C=N containing biologically active compounds. The enhanced performance of CB heterojunction was mainly ascribed to improved charge transfer and separation intrinsically derived from the staggered band energy configuration of the CB heterojunction as evidenced from photoelectrochemical, steady-state photoluminescence and time-resolved fluorescence studies. Electron paramagnetic resonance (EPR), Hammett and active species quenching results revealed the O₂^•–-assisted mechanism with a possible carbocationic intermediate being generated. Under anaerobic condition, the reaction can also proceed probably through carbon-centered radical. Based on UV-vis, XPS and Mott-Schottky results, band energy level diagram and a plausible reaction mechanism at solid-liquid interface were also revealed.

在本文中，首次报道了使用冷白光在大气中空气中gC ₃ N ₄ / BiOBr（CB）异质结在苄胺的氧化C-N偶联中的光催化活性。通过两步燃烧-共沉淀法制备了CB异质结。通过调谐GC的重量百分比₃ Ñ ₄，含GC的10.2％（重量）的最佳催化剂₃ Ñ ₄提供的最高苄胺转化CA。94％的最佳N-亚苄基苄胺产率约为。在4小时内照射82％。讨论了催化剂用量，底物浓度，光强和反应温度对光催化性能的影响。CB催化剂还成功氧化了N-杂环胺和仲胺转化成它们相应的亚胺，这扩展了该催化剂的范围和在其他含C = N的生物活性化合物的合成中的潜在用途。CB异质结的性能增强主要归因于CB异质结交错带能构型固有的电荷转移和分离的改善，这从光电化学，稳态光致发光和时间分辨荧光研究中可以看出。电子顺磁共振（EPR），哈米特（Hammett）和活性物质淬灭结果显示O ₂ ^•–辅助机制，可能生成碳正离子中间体。在厌氧条件下，反应也可能通过以碳为中心的自由基进行。基于紫外可见光谱，XPS和Mott-Schottky结果，还给出了能带图和固液界面的合理反应机理。