College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Rd., Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Rd., Shanghai, 200092, China; Department of Materials Science and Engineering, Adama Science and Technology University, Adama, Ethiopia.
College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Rd., Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Rd., Shanghai, 200092, China.
Chemosphere. 2024 Oct;365:143347. doi: 10.1016/j.chemosphere.2024.143347. Epub 2024 Sep 14.
Improving the charge separation, charge transfer, and effective utilization is crucial in a photocatalysis system. Herein, we prepared a novel direct Z-scheme NH-MIL-125(Ti)@FeOCl (Ti-MOF@FeOCl) composite photocatalyst through a simple method. The prepared composite catalyst was utilized in the photo-Fenton degradation of Rhodamine B (RhB) and ciprofloxacin (CIP). The Ti-MOF@FeOCl (10FeTi-MOF) catalyst exhibited the highest catalytic performance and degraded 99.1 and 66% of RhB and CIP, respectively. However, the pure NH-MIL-125(Ti) (Ti-MOF) and FeOCl catalysts achieved only 50 and 92% of RhB and 50 and 37% of CIP, respectively. The higher catalytic activities of the Ti-MOF@FeOCl composite catalyst could be due to the electronic structure improvements, photoinduced charge separations, and charge transfer abilities in the catalyst system. The composite catalysts have also enhanced adsorption and visible light-responsive properties, allowing for efficient degradation. Furthermore, the electron paramagnetic resonance (EPR) signals, the reactive species trapping experiments, and Mott-Schottky (M - S) measurements revealed that the photogenerated superoxide radical (•O-), hydroxyl radical (•OH), and holes (h+) played a vital role in the degradation process. The results also demonstrated that the Ti-MOF@FeOCl heterojunction composite catalysts could be a promising photo-Fenton catalyst system for the environmental remediation. Environmental implications The discharging of toxic contaminants such as organic dyes, antibiotics, and other emerging pollutants to the environment deteriorates the ecosystem. Specifically, the residues of organic pollutants recognized as a threat to ecosystem and a cause for carcinogenic effects. Among them, ciprofloxacin is one of antibiotics which has biological resistance, and metabolize partially in the human or animal bodies. It is also difficult to degrade ciprofloxacin completely with traditional treatment methods. Similarly, organic dyes are also toxic and a cause for carcinogenic effects. Therefore, effective degradation of organic pollutants such as RhB and ciprofloxacin with appropriate method is crucial.
提高光催化系统中的电荷分离、电荷转移和有效利用率至关重要。在此，我们通过一种简单的方法制备了一种新型的直接 Z 型 NH-MIL-125(Ti)@FeOCl（Ti-MOF@FeOCl）复合光催化剂。所制备的复合催化剂用于罗丹明 B（RhB）和环丙沙星（CIP）的光芬顿降解。Ti-MOF@FeOCl（10FeTi-MOF）催化剂表现出最高的催化性能，分别降解了 99.1%和 66%的 RhB 和 CIP。然而，纯 NH-MIL-125(Ti)（Ti-MOF）和 FeOCl 催化剂仅分别达到 50%和 92%的 RhB 和 50%和 37%的 CIP。Ti-MOF@FeOCl 复合催化剂具有更高的催化活性，这可能是由于催化剂体系中电子结构的改善、光诱导电荷分离和电荷转移能力。复合催化剂还增强了吸附和可见光响应性能，从而实现了高效降解。此外，电子顺磁共振（EPR）信号、活性物种捕获实验和 Mott-Schottky（M-S）测量表明，光生超氧自由基（•O-）、羟基自由基（•OH）和空穴（h+）在降解过程中起着重要作用。结果还表明，Ti-MOF@FeOCl 异质结复合催化剂可能是一种有前途的光芬顿催化剂体系，可用于环境修复。环境影响 有毒污染物（如有机染料、抗生素和其他新兴污染物）排放到环境中会恶化生态系统。具体而言，被认为对生态系统构成威胁并导致致癌作用的有机污染物残留物。其中，环丙沙星是一种具有生物抗性的抗生素，部分在人体或动物体内代谢。传统的处理方法也很难完全降解环丙沙星。同样，有机染料也是有毒的，也是致癌的原因。因此，用适当的方法有效降解有机染料（如 RhB）和环丙沙星等有机污染物至关重要。
