Sasikumar Kandasamy, Rajamanikandan Ramar, Ju Heongkyu
Department of Physics, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea.
Materials (Basel). 2024 Dec 20;17(24):6225. doi: 10.3390/ma17246225.
The rational design of heterojunction photocatalysts enabling fast transportation and efficient separation of photoexcited charge carriers is the key element in visible light-driven photocatalyst systems. Herein, we develop a unique Z-scheme heterojunction consisting of NiMoO microflowers (NMOF) and ZIF67, referred to as ZINM (composite), for the purpose of antibiotic degradation. ZIF67 was produced by a solution process, whereas NMOF was synthesized via coprecipitation with a glycine surfactant. The NMOF exhibited a monoclinic phase with a highly oriented, interconnected sheet-like morphology. The ZINM showed better optical and charge transfer characteristics than its constituents, ZIF67 and NiMoO. Consequently, the developed heterojunction photocatalysts exhibited superior photocatalytic redox capability; the ZINM30 (the composite with 30 wt.% of NiMoO loaded) could degrade 91.67% of tetracycline and 86.23% of norfloxacin within 120 min. This enhanced photocatalytic activity was attributable to the reduced bandgap (E = 2.01 eV), unique morphology, high specific surface area (1099.89 m/g), and intimate contact between ZIF67 and NiMoO, which facilitated the establishment of the Z-scheme heterojunction. Active species trapping tests verified that •O and h were the primary species, supporting the proposed degradation mechanism. This work highlights a valid Z-scheme ZIF67/NiMoO heterojunction system for efficient carrier separation and, therefore, enhanced photocatalytic degradation of antibiotics.
能够实现光激发电荷载流子快速传输和高效分离的异质结光催化剂的合理设计是可见光驱动光催化剂体系的关键要素。在此，我们开发了一种独特的Z型异质结，由NiMoO微花（NMOF）和ZIF67组成，称为ZINM（复合材料），用于抗生素降解。ZIF67通过溶液法制备，而NMOF通过与甘氨酸表面活性剂共沉淀合成。NMOF呈现单斜相，具有高度取向、相互连接的片状形态。ZINM表现出比其组分ZIF67和NiMoO更好的光学和电荷转移特性。因此，所开发的异质结光催化剂表现出优异的光催化氧化还原能力；ZINM30（负载30 wt.% NiMoO的复合材料）在120分钟内可降解91.67%的四环素和86.23%的诺氟沙星。这种增强的光催化活性归因于带隙减小（E = 2.01 eV）、独特的形态、高比表面积（1099.89 m/g）以及ZIF67和NiMoO之间的紧密接触，这有利于建立Z型异质结。活性物种捕获测试证实•O和h是主要物种，支持所提出的降解机制。这项工作突出了一种有效的Z型ZIF67/NiMoO异质结体系，用于高效的载流子分离，从而增强抗生素的光催化降解。
