Catalytic ozonation of norfloxacin using Co3O4/C composite derived from ZIF-67 as catalyst. (February 2021)

• Record Type: Journal Article
• Authors: Chen, Hai; Zhang, Zhonglei; Hu, Dongming; Chen, Chuanhong; Zhang, Youxue; He, Shijun; Wang, Jianlong
• Is Part Of: Chemosphere. Volume 265(2021)
• Publication Date: 2021-02
• Subjects: Catalytic ozonation -- Norfloxacin -- Co3O4–C -- Antibiotics -- Degradation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.129047
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this study, Co3 O4 -carbon composite was synthesized by calcined metal organic framework (MOF) ZIF-67 and used as efficient catalysts for ozonation of norfloxacin (NOF). The MOF-derived Co3 O4 –C composite remained similar polyhedrons structure of ZIF-67, suggesting that Co3 O4 was well-dispersed in Co3 O4 –C composite. Furthermore, a larger amount of surface carbon-oxygen functional groups were distributed on Co3 O4 –C composite, which resulted in the diversification of active sites for catalytic ozonation reaction. NOF degradation and mineralization could be effectively enhanced in Co3 O4 –C/O3 process. Moreover, NOF mineralization by catalytic ozonation strongly depended on the solution pH, while other operational conditions, such as O3 concentration and catalyst dosage had not obvious influence on it. Co3 O4 –C composite could significantly accelerate O3 decomposition to produce active free radicals (such as OH), which enhanced the mineralization of NOF. The possible catalytic mechanism of Co3 O4 –C composite was proposed. Additionally, after five consecutive use of Co3 O4 –C composite in catalytic ozonation process, there was no obvious decrease in TOC removal efficiency, indicating a stable performance of Co3 O4 –C composite, which was suitable for the catalytic ozonation for wastewater treatment. Graphical abstract: Image 1 Highlights: ZIF-67 derived Co3 O4 –C composite existed a similar polyhedrons structure of ZIF-67. NOF degradation and mineralization was significantly improved in Co3 O4 –C/O3 process. The composite enhanced O3 decomposition and.OH generation in catalytic ozonation. .OH play a crucial role in TOC removal in the Co3 O4 –C/O3 process.