Hebei Province Key Laboratory of Sustained Utilization and Development of Water Resources, Hebei Province Collaborative Innovation Center for Sustainable Utilization of Water Resources and Optimization of Industrial Structure, Hebei Center for Ecological and Environmental Geology Research, Hebei GEO University, Shijiazhuang, China.
Hebei Key Laboratory of Inorganic Nano-materials, College of Chemistry and Material Sciences, Hebei Normal University, Shijiazhuang, China.
J Environ Manage. 2024 Jul;364:121431. doi: 10.1016/j.jenvman.2024.121431. Epub 2024 Jun 13.
The intimate coupling of photocatalysis and biodegradation (ICPB) technology has received much attraction because of the advantages of both photocatalytic reaction and biological treatment. In this study, ZnO-CoFeO@BC (ZCFC) with p-n heterojunction was prepared and used in an ICPB system to degrade metronidazole (MNZ) wastewater. The microstructure, morphology, and optical behavior of heterojunctions in ZCFC were investigated using SEM, XRD, UV-vis, FTIR, and XPS techniques. The results showed that ZCFC inherited the advantages of bamboo biochar's large pore size, and its large pore structure could provide a habitat for bacterial colonization in ICPB, thus shortening the internal mass transfer distance. The degradation of MNZ and chemical oxygen demand (COD) by the ICPB system was 86.8% and 58.5%, respectively, which was superior to single photocatalysis (72.5% for MNZ and 43.8% for COD) and single biodegradation (23.5% for MNZ and 20.1% for COD). In ICPB, photocatalysis and biodegradation showed a synergistic effect in the removal of MNZ, and the order of the major reactive oxygen species (ROS) leading to reduced toxicity of MNZ to the biofilm was •OH > h > O•. High-throughput sequencing analysis showed continuous evolution of biofilm structures in ICPB enriched a variety of functional species, among which the electroactive bacteria Alcaligenes and Brevundimonas played an important role in the degradation of MNZ. In this study, we investigated the possible mechanism of photocatalytic and microbial synergistic degradation of MNZ in the ICPB system and proposed a new technology for degrading antibiotic wastewater that combines the advantages of photocatalysis and biodegradation.
光催化和生物降解（ICPB）技术的紧密耦合因其光催化反应和生物处理的优点而受到广泛关注。在这项研究中，制备了具有 p-n 异质结的 ZnO-CoFeO@BC（ZCFC），并将其用于 ICPB 系统中降解甲硝唑（MNZ）废水。使用 SEM、XRD、UV-vis、FTIR 和 XPS 技术研究了 ZCFC 中异质结的微观结构、形貌和光学行为。结果表明，ZCFC 继承了竹生物炭大孔径的优点，其大孔结构可为 ICPB 中的细菌定殖提供栖息地，从而缩短了内部传质距离。ICPB 系统对 MNZ 和化学需氧量（COD）的降解率分别为 86.8%和 58.5%，优于单一光催化（MNZ 为 72.5%，COD 为 43.8%）和单一生物降解（MNZ 为 23.5%，COD 为 20.1%）。在 ICPB 中，光催化和生物降解在 MNZ 的去除中表现出协同作用，导致 MNZ 毒性降低的主要活性氧（ROS）的顺序为•OH>h>O•。高通量测序分析表明，ICPB 中生物膜结构的连续演变富集了多种功能物种，其中电活性细菌 Alcaligenes 和 Brevundimonas 在 MNZ 的降解中发挥了重要作用。在这项研究中，我们研究了 ICPB 系统中 MNZ 的光催化和微生物协同降解的可能机制，并提出了一种结合光催化和生物降解优点的新型抗生素废水降解技术。
