Semiconductor photocatalytic technology is a sustainable and less energy consuming one for nitrogen (N2) reduction to produce ammonia (NH3). In this study, flower-like hierarchical N doped MoS2 (N-MoS2) microsphere was synthesized as a photocatalyst by one-step solvothermal method, which was assembled by numerous interleaving nanosheets petals with thin thickness. Besides, Pt nanoparticles were loaded on the surface of N-MoS2 via photo-ultrasonic reduction method. The as-prepared Pt/N-MoS2 photocatalyst exhibited higher N2 fixation ability than that over pure MoS2 and N-MoS2, which can be attributed to that the N doping narrows the band gap, and the Schottky barrier due to the existence of Pt nanoparticles improves the charge transfer and carrier separation. The reduction of N2 with ultrasonic irradiation was also investigated under visible light irradiation to evaluate the sonophotocatalytic activity of the Pt/N-MoS2 microsphere. The results showed that the N2 reduction rate of sonophotocatalysis (133.8 µmol/g(cat)h) was higher than that of sonocatalysis and photocatalysis, which can be ascribed to the synergistic effect of ultrasound and visible light irradiation. The effects of catalyst dosage, ultrasonic power and ultrasonic pulse on the photocatalytic efficiency were also studied. Meanwhile, a possible mechanism for improved sonophotocatalytic performance was also proposed.

中文翻译：

---

简便的光超声辅助合成花状Pt / N-MoS2微球，作为有效的固氮声光催化剂。

半导体光催化技术是一种可持续且耗能较少的技术，可用于还原氮（N2）以产生氨（NH3）。本研究通过一步溶剂热法合成了花状的分层氮掺杂的MoS2（N-MoS2）微球作为光催化剂，该光球是由许多厚度较薄的交错纳米片花瓣组装而成的。此外，通过光超声还原法将铂纳米颗粒负载在N-MoS2表面。制备的Pt / N-MoS2光催化剂比纯MoS2和N-MoS2表现出更高的N2固定能力，这可以归因于N掺杂使能带隙变窄，并且由于Pt纳米粒子的存在而形成了肖特基势垒改善了电荷转移和载流子分离。还研究了在可见光照射下超声辐照对N2的还原作用，以评估Pt / N-MoS2微球的声光催化活性。结果表明，声光催化的N2还原速率（133.8 µmol / g（cat）h）高于声光催化和光催化，这可以归因于超声和可见光辐射的协同作用。研究了催化剂用量，超声功率和超声脉冲对光催化效率的影响。同时，还提出了改善声光催化性能的可能机理。比声催化和光催化要高8 µmol / g（cat.h），这可以归因于超声和可见光辐射的协同作用。研究了催化剂用量，超声功率和超声脉冲对光催化效率的影响。同时，还提出了改善声光催化性能的可能机理。比声催化和光催化要高8 µmol / g（cat）h），这可以归因于超声和可见光辐射的协同作用。研究了催化剂用量，超声功率和超声脉冲对光催化效率的影响。同时，还提出了改善声光催化性能的可能机理。