Department of Chemistry, Semnan University, P.O. Box 35131-19111, Semnan, Iran.
Department of Chemistry, Iran University of Science and Technology, Tehran, 16846-13114, Iran.
J Environ Manage. 2023 Apr 15;332:117377. doi: 10.1016/j.jenvman.2023.117377. Epub 2023 Feb 3.
The emergence of new diseases and the unplanned industrialization of cities have led to new diseases and the subsequent use of antibiotics. Hence the remediation of wastewater containing antibiotics and their severe pollution has raised serious concerns in recent years. Herein coral-shaped α-FeO/ZnO/reduced graphene oxide (r-GO)-like carbon heterojunction in-situ were prepared from basil seed as a sustainable biomass resource and applied for the photodegradation of the oxytetracycline (OTC) as a typical antibiotic in a helical plug flow photoreactor (HPFPR) via persulfate activation under visible light irradiation. Spectroscopy and electrochemical results confirmed the tunable band structure and quick light absorption, superior charge separation and transfer, satisfactory charge carrier lifetime, and long-term stability for the prepared photocatalyst. The 98% degradation efficiency was achieved for OTC within 90 min fitted by a first-order kinetic model with the rate constant of 0.1248 min. The finding proves that HPFPR exhibited a higher degradation rate of OTC by 2.3 times compared to the batch reactor. The 3D computational fluid dynamics (CFD) model confirmed the outstanding performance of the HPFPR. Scavenging experiments integrated with mott Schottky and DRS results revealed that rGO intensifies the S-scheme charge carrier transfer and built-in electric field and reduces the recombination. Finally, this work has substantial potential for the in-situ synthesis of environmental-friendly and large-scale metal oxide heterojunctions in natural carbon supports as well as scale-up and gives novel insights from molecular and engineering points of view into the wastewater remediation processes and clean water production.
新疾病的出现和城市的无计划工业化导致了新疾病的出现以及随后抗生素的使用。因此，近年来，含有抗生素的废水的修复及其严重污染引起了人们的严重关注。在此，从罗勒种子作为一种可持续的生物质资源中，原位制备了珊瑚状α-FeO/ZnO/还原氧化石墨烯(r-GO)-样碳异质结，并在可见光照射下通过过硫酸盐活化应用于螺旋插件流光反应器 (HPFPR) 中光降解土霉素 (OTC) 作为一种典型的抗生素。光谱和电化学结果证实了所制备的光催化剂可调谐的能带结构和快速光吸收、优越的电荷分离和转移、令人满意的载流子寿命和长期稳定性。OTC 在 90 分钟内达到 98%的降解效率，符合一级动力学模型，速率常数为 0.1248 min。该发现证明 HPFPR 对 OTC 的降解速率比批式反应器高 2.3 倍。3D 计算流体动力学 (CFD) 模型证实了 HPFPR 的出色性能。与莫特肖特基和 DRS 结果相结合的清除实验表明，rGO 增强了 S 型电荷载流子转移和内置电场，并减少了重组。最后，这项工作为在天然碳载体中原位合成环保和大规模金属氧化物异质结以及扩大规模提供了巨大的潜力，并从分子和工程角度为废水修复过程和清洁水生产提供了新的见解。
