A single semiconductor remains a great challenge for photocatalysis due to highly recombination of charge carriers. However, construction of multiple heterojunctions photocatalysts is an effective way for photocatalysis technique. Herein, two-dimensional sheet-like highly oriented SnS₂/RGO/Ag (SRA) nanocomposites with multiple junctions including schottky- and RGO-n junctions designed and synthesized via hydrothermal strategy followed by in situ sequential UV reductions. The as-prepared SRA nanocomposites exhibited superior photoelectrochemical conversion efficiencies and photocatalytic activities for the degradation of typical antibiotics Norfloxacin (NOR) under simulated solar light condition, with the highest removal ratio of 94%. XPS and low temperature EPR technology demonstrates the existence of oxygen vacancies and chemical bond effect among SnS₂, Ag and RGO components. Highly oriented crystal facet and efficient spatial charge carrier separations and interfacial transfers in the photo-induced redox reactions are evidenced by various physical techniques. Interestingly, in this paper, RGO was proposed to act as holes trapper to improve photo responsive charge separation in great extent. The mechanism of photoinduced redox reactions including the pathways of interfacial charges transfers and ROS species generations have been proposed in terms of the Density Functional Theory (DFT) quantum calculations and the outcomes of various physicochemical characterizations over SRA nanocomposites.

由于电荷载流子的高度重组，单个半导体仍然是光催化的巨大挑战。然而，多种异质结光催化剂的构建是光催化技术的有效途径。在此，二维片状高取向SnS ₂/ RGO / Ag（SRA）纳米复合材料，具有多个结，包括通过水热策略设计和合成的肖特基和RGO-n结，然后依次进行原位UV还原。所制备的SRA纳米复合材料在模拟太阳光条件下对典型抗生素诺氟沙星（NOR）的降解表现出优异的光电化学转化效率和光催化活性，最高去除率为94％。XPS和低温EPR技术表明SnS ₂之间存在氧空位和化学键效应，银和RGO组件。光诱导的氧化还原反应中高度取向的晶面和有效的空间电荷载流子分离以及界面转移已通过各种物理技术得到证明。有趣的是，本文提出了将RGO用作空穴陷阱，以在很大程度上改善光响应电荷的分离。根据密度泛函理论（DFT）量子计算和SRA纳米复合材料的各种物理化学表征的结果，提出了光诱导的氧化还原反应的机制，包括界面电荷转移和ROS物种生成的途径。