Enhancing hydrogen peroxide activation of CuCo layered double hydroxide by compositing with biochar: Performance and mechanism

Ling Li; Min Cheng; Lei Qin; Eydhah Almatrafi; Xiaofeng Yang; Lu Yang; Chensi Tang; Shiyu Liu; Huan Yi; Mingming Zhang; Yukui Fu; Xuerong Zhou; Fuhang Xu; Guangming Zeng; Cui Lai

doi:10.1016/j.scitotenv.2022.154188

Enhancing hydrogen peroxide activation of CuCo layered double hydroxide by compositing with biochar: Performance and mechanism

Sci Total Environ. 2022 Jul 1:828:154188. doi: 10.1016/j.scitotenv.2022.154188. Epub 2022 Feb 28.

Authors

Ling Li¹, Min Cheng¹, Lei Qin¹, Eydhah Almatrafi², Xiaofeng Yang¹, Lu Yang¹, Chensi Tang¹, Shiyu Liu¹, Huan Yi¹, Mingming Zhang¹, Yukui Fu¹, Xuerong Zhou¹, Fuhang Xu¹, Guangming Zeng³, Cui Lai⁴

Affiliations

¹ College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China.
² Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
³ College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China; Center of Research Excellence in Renewable Energy and Power Systems, Center of Excellence in Desalination Technology, Department of Mechanical Engineering, Faculty of Engineering-Rabigh, King Abdulaziz University, Jeddah 21589, Saudi Arabia. Electronic address: zgming@hnu.edu.cn.
⁴ College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, PR China. Electronic address: laicui@hnu.edu.cn.

PMID: 35240166
DOI: 10.1016/j.scitotenv.2022.154188

Abstract

In this study, CuCo layered double hydroxide/biochar composite (CuCo LDH/BC) was prepared and employed for activating H₂O₂ to degrade ciprofloxacin (CIP), a common fluroquinolone antibiotic detected in water environment. The as-synthesized catalysts were also comprehensively characterized to study the physiochemical properties. For the catalytic activity, the degradation rate of CuCo LDH/BC to CIP was approximately 1.5 times higher than that of CuCo LDH. The improved catalytic activity can be ascribed to the synergistic effect between CuCo LDH and BC, such as more functional groups, accelerated electron transfer, and varied charge distribution. Meanwhile, CuCo LDH/BC/H₂O₂ could degrade CIP efficiently in a wider pH range comparing with CuCo LDH/H₂O₂, and the efficiency was approximately 84.7% at neutral pH within 90 min. The generation of OH, O₂^- and ¹O₂ in CuCo LDH/BC/H₂O₂ system were then verified by electron spin resonance (ESR) technology. The quenching experiments indicated that both non-radical pathway (¹O₂) and radical pathway (OH, O₂^-) led to CIP degradation, in which O₂^- and ¹O₂ made major contribution. Then, the intermediate products of CIP during catalytic reaction were monitored by high-performance liquid chromatography-mass spectrometry (HPLC-MS), and the environmental risk of these degradation intermediates was tested through seed germination experiments. This study tends to provide valuable information for LDH/BC application in heterogeneous Fenton-like reaction.

Keywords: Antibiotic; Biochar; H(2)O(2) activation; Layered double hydroxide; Water treatment.

MeSH terms

Charcoal* / chemistry
Ciprofloxacin
Hydrogen Peroxide* / chemistry
Hydroxides / chemistry

Substances

Hydroxides
biochar
Charcoal
Ciprofloxacin
Hydrogen Peroxide