Department of Physics, Thiagarajar College (Affiliated to Madurai Kamaraj University), Madurai, Tamil Nadu, 625009, India.
Department of Physics, Thiagarajar College (Affiliated to Madurai Kamaraj University), Madurai, Tamil Nadu, 625009, India.
Chemosphere. 2023 Nov;341:139984. doi: 10.1016/j.chemosphere.2023.139984. Epub 2023 Aug 30.
The discharge of amoxicillin (AMX) from pharmaceutical intermediates has adverse effects on aquatic ecosystems. The elimination of AMX requires advanced oxidation processes (AOPs) that utilize high-performance photocatalysts. Furthermore, the design of highly visible light photocatalysts for AOPs demands both cost-effectiveness and efficiency. In this work, a plasmon-assisted visible light photocatalyst of 2D Ag-CoFeO nanohybrids was successfully synthesized and characterized with several analytical tools to degrade AMX in aqueous solutions through advanced AOPs. The results showed that the Ag-CoFeO nanohybrids had excellent photocatalytic activity and stability, which could efficiently reduce the AMX concentration by 99% within 70 min under visible light irradiation. In particular, CoFeO and Ag have an interfacial contact that prevents electron-hole pair recombination more effectively than pure CoFeO, which results in electrons in its conduction band (CB) migrating to metallic Ag sites. Thus, charge transfers between the two materials are more efficient, leading to higher photocatalytic oxidation of AMX. Furthermore, the surface plasmon of Ag nanoparticles are excited by their plasmonic resonance, which increases the absorption of visible light. The plasmon-assisted visible light photocatalyst could replace expensive and energy-intensive advanced oxidation processes (AOPs). AOPs pathways associated with AMX have been discussed in detail. The HPLC chromatogram clearly showed AMX was oxidized by four-membered B-lactam ring opening and hydroxylation with •OH. 2D Ag-CoFeO heterostructure was found to be efficient, selective, and cost-effective for the degradation of several pharmaceutical compounds. Additionally, it was found to be eco-friendly and sustainable, making it a viable alternative to AOPs.
阿莫西林（AMX）从医药中间体中的排放会对水生生态系统产生不利影响。消除 AMX 需要利用高效光催化剂的高级氧化工艺（AOPs）。此外，设计用于 AOPs 的高光活性光催化剂需要兼具成本效益和效率。在这项工作中，成功地合成了一种二维 Ag-CoFeO 纳米杂化物的等离子体辅助可见光光催化剂，并通过多种分析工具对其进行了表征，以通过高级 AOP 来降解水溶液中的 AMX。结果表明，Ag-CoFeO 纳米杂化物具有出色的光催化活性和稳定性，在可见光照射下，可在 70 分钟内将 AMX 的浓度有效降低 99%。特别是，CoFeO 和 Ag 之间存在界面接触，可比纯 CoFeO 更有效地阻止电子-空穴对的复合，从而导致其导带（CB）中的电子迁移到金属 Ag 位。因此，两种材料之间的电荷转移更有效，导致 AMX 的光催化氧化效率更高。此外，Ag 纳米粒子的表面等离子体被其等离子体共振激发，从而增加了可见光的吸收。等离子体辅助可见光光催化剂可以替代昂贵且能源密集型的高级氧化工艺（AOPs）。详细讨论了与 AMX 相关的 AOP 途径。HPLC 色谱图清楚地表明，AMX 通过四元 B-内酰胺环的开环和与•OH 的羟化作用被氧化。二维 Ag-CoFeO 异质结构被发现对几种药物化合物的降解具有高效、选择性和成本效益。此外，它被发现是环保和可持续的，是 AOPs 的可行替代品。
