Developing dual functional catalysts for photocatalytic hydrogen evolution and pollutant degradation is one of the most ideal methods to address energy and environmental pollution. In the present study, an S-scheme ZnInS/crystalline polymeric carbon nitride (ZIS/CPCN) heterojunction was synthesized using simple hydrothermal and calcination methods. The CPCN with a highly ordered heptazine-imide structure within the layer imparts a suitable band structure, while the widened interlayer spacing facilitates rapid electron transfer through surface engineering to construct heterojunctions. During the in-situ growth process, ZnInS uniformly distributes on the high surface area of CPCN as ultra-thin nanosheets. Under visible light irradiation, ZIS/CPCN-2 exhibited the highest hydrogen production activity (3492 μmol·g·h), which was 4 times and 112 times higher than ZIS and CPCN, respectively. Furthermore, the ZIS/CPCN catalyst demonstrated a certain degradation rate for quinolone antibiotics within 180 min, involving the •OH and •O radicals, and analyzed the degradation pathway of levofloxacin. The most stable configuration was obtained through theoretical calculations, and the density of states and work function of the sample were computed, proposing the S-scheme mechanism. This work contributes to the development of efficient photocatalytic systems with dual functions of hydrogen evolution and degradation.

中文翻译：

---

双功能 S 型 ZnIn2S4/结晶聚合氮化碳 (ZIS/CPCN) 异质结可有效光催化析氢和降解左氧氟沙星


开发用于光催化析氢和污染物降解的双功能催化剂是解决能源和环境污染的最理想方法之一。在本研究中，采用简单的水热和煅烧方法合成了S型ZnInS/结晶聚合氮化碳（ZIS/CPCN）异质结。层内具有高度有序七嗪酰亚胺结构的CPCN赋予了合适的能带结构，而加宽的层间距有利于通过表面工程快速电子转移以构建异质结。在原位生长过程中，ZnInS作为超薄纳米片均匀分布在CPCN的高表面积上。在可见光照射下，ZIS/CPCN-2表现出最高的产氢活性（3492 μmol·g·h），分别是ZIS和CPCN的4倍和112倍。此外，ZIS/CPCN催化剂在180分钟内对喹诺酮类抗生素表现出一定的降解率，涉及•OH和•O自由基，并分析了左氧氟沙星的降解途径。通过理论计算得到了最稳定的构型，并计算了样品的态密度和功函数，提出了S型机理。这项工作有助于开发具有析氢和降解双重功能的高效光催化系统。