面对存在大量的催化剂，氧和氮的小分子的光催化还原效率仍然较低，并且存在

Facing the existence of a large amount of catalyst, the photocatalytic reduction efficiency of small molecules of oxygen and nitrogen is still low, and there are fatal problems, such as catalyst deactivation. Therefore, this article focuses on simple surface modification technology, on the one hand, it is committed to introducing new active sites on the surface of low-activity semiconductor catalysts to convert the catalysts into high-activity catalysts. Inspired by the structure of the key active substance of ferromolybdenum cofactor in nitrogenase, using ultrasonic delamination combined with secondary hydrothermal surface iron modification strategy, a monoatomic iron surface modified few layer molybdenum disulfide (MoS2) photocatalyst was designed and synthesized for nitrogen Reduction reaction. At the same time, it combines XRD, Raman, TEM and other material characterization techniques. Using scanning and transmission electron microscopy, the surface modification mechanism of the catalytically active site surface is described by the atomic structure and local electronic structure of the catalyst surface. It also contributes to the promotion of photocatalytic reduction of the main N2 molecules in the air.

面对存在大量的催化剂，氧和氮的小分子的光催化还原效率仍然较低，并且存在致命的问题，例如催化剂失活。因此，本文着重于简单的表面改性技术，一方面致力于在低活性半导体催化剂表面引入新的活性位点，使催化剂转化为髙活性催化剂。以固氮酶中关键活性物质钼铁辅因子结构为灵感，采用超声剥层结合二次水热表面铁修饰策略，设计合成了单原子铁表面修饰少层二硫化钼（MoS2）光催化剂用于氮气的还原反应。同时，它结合了XRD，Raman，TEM和其他材料表征技术。使用扫描和透射电子显微镜，通过催化剂表面的原子结构和局部电子结构描述了催化活性位点表面的表面改性机制它还有助于空气中主要N2分子的光催化还原促进。

In the face of a large number of catalysts, the photocatalytic reduction efficiency of small molecules of oxygen and nitrogen is still low, and there are fatal problems, such as catalyst deactivation. Therefore, this paper focuses on simple surface modification technology. On the one hand, it is committed to introducing new active sites on the surface of low active semiconductor catalyst to transform the catalyst into high active catalyst. Inspired by the cofactor structure of ferromolybdenum, which is the key active substance in nitrogenase, a new photocatalyst named monatomic iron surface modified molybdenum disulfide (MoS2) was designed and synthesized by ultrasonic delamination and secondary hydrothermal surface iron modification. At the same time, it combines XRD, Raman, TEM and other material characterization techniques. By using scanning and transmission electron microscopy, the surface modification mechanism of catalytic active sites was described through the atomic and local electronic structures of the catalyst surface, which also contributed to the photocatalytic reduction of the main N2 molecules in the air.<br>