Well-defined core/shell type single crystalline Fe₇S₈/Fe₃O₄ coated α-Fe hybrids (Fe₇S₈/Fe₃O₄@Fe) are synthesized with vacuum chemical vapor deposition (CVD) technique. The CVD process triggers conversion of naturally formed Fe₃O₄ layer on the surface of commercial Fe nanoparticles from amorphous into single crystalline phase. The Fe₇S₈/Fe₃O₄ coat promotes the surface affinity of dissolved oxygen and targets and rapidly transfers electrons from the Fe core to targets, which decreases water splitting on Fe₇S₈/Fe₃O₄@Fe surface and endows Fe₇S₈/Fe₃O₄@Fe with ultra-strong reducibility and improved oxidative ability under different conditions. Different with the sulfurized ZVI prepared with hydrothermal or solvothermal method, the increase of reaction solution pH is retarded due to the relieved water splitting instead of releasing H⁺ via oxidation of S²⁻/S₂²⁻ on the Fe₇S₈ coat. The cooperation of Fe₇S₈ with Fe₃O₄ and α-Fe not only improves the anti-oxidation ability of Fe₇S₈ coating but also broadens its band gap. By using Fe₇S₈/Fe₃O₄@Fe nanohybrids as photocatalysts, light irradiation accelerates the degradation of organic pollutants combined with enhanced mineralization efficiency. The Fe₇S₈/Fe₃O₄@Fe exhibits good performance when it is utilized to treat the influent from a municipal sewage treatment plant upon air aeration or under visible light and solar light irradiation.

利用真空化学气相沉积（CVD）技术合成了定义明确的核/壳型单晶Fe ₇ S ₈ / Fe ₃ O ₄包覆的α-Fe杂化物（Fe ₇ S ₈ / Fe ₃ O ₄ @Fe）。CVD工艺触发了商业化的Fe纳米颗粒表面上天然形成的Fe ₃ O ₄层从非晶态转变为单晶相。Fe ₇ S ₈ / Fe ₃ O ₄涂层促进溶解的氧和目标的表面亲和力和快速地从铁芯到目标，这降低了对Fe水分解电子转移₇小号₈ / Fe的₃ ö ₄ @Fe表面和赋予的Fe ₇小号₈ / Fe的₃ ö ₄ @铁在不同条件下具有极强的还原性，并具有增强的氧化能力。与水热法或溶剂热法制得的硫化ZVI不同，反应溶液pH值的增加由于缓和的水分解而不是通过S ^2- / S ₂ ^2-在Fe ₇上的氧化而释放出H ⁺而被阻止。S ₈大衣。Fe ₇ S ₈与Fe ₃ O ₄和α-Fe的配合不仅提高了Fe ₇ S ₈涂层的抗氧化能力，而且扩大了其带隙。通过使用Fe ₇ S ₈ / Fe ₃ O ₄ @Fe纳米杂化物作为光催化剂，光辐照加速了有机污染物的降解并提高了矿化效率。Fe ₇ S ₈ / Fe ₃ O ₄当@Fe被用于处理通气或可见光和太阳光照射下的市政污水处理厂的进水时，表现出良好的性能。