Peroxymonosulfate activation by nitrogen-doped herb residue biochar for the degradation of tetracycline. (15th February 2023)

• Record Type: Journal Article
• Authors: Li, Xin; Wang, Jiayue; Xia, Lu; Cheng, Rujun; Chen, Jianqiu; Shang, Jingge
• Is Part Of: Journal of environmental management. Volume 328(2023)
• Publication Date: 2023-02-15
• Subjects: Antibiotics -- Biochar -- Non-radical -- Peroxymonosulfate (PMS) -- Singlet oxygen; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.117028
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Biochar is an environmentally friendly material with potential applications in water purification. In this study, herb residue nitrogen-doped biochar (N-BC) was fabricated and used to activate peroxymonosulfate (PMS). Characterization and density-functional theory (DFT) studies were conducted to explore the influence of nitrogen doping. Radical scavenging activity and electron paramagnetic resonance (EPR) spectroscopy revealed that non-radical singlet oxygen ( 1 O2 ) is the main reactive oxidative species. Additionally, pyridinic-N was shown to play a pivotal role in the 1 O2 -dominated pathway. Three possible degradation pathways were proposed based on the identified degradation intermediates. Batch experiments confirmed that N-BC showed excellent catalytic performance and reusability. The best condition for tetracycline (TC) degradation efficiency (>99%) in 60 min was obtained when the dosage of N-BC was 1 g/L and the concentration of PMS was 5 mM. Furthermore, N-BC showed approximately 65.5% degradation efficiency within 4 cycles. Furthermore, the toxicity of degradation intermediates was examined using ECOSAR and T.E.S.T procedures. This study brings forth a feasible strategy to synthesize biochar. Furthermore, the proposed approach will facilitate the use of biochar in water purification. Graphical abstract: Image 1 Highlights: Nitrogen doped biochar was an efficient catalyst for peroxymonosulfate activation. Non-radical singlet oxygen was the dominant reactive oxidative species. Nitrogen doped biochar maintained catalytic effect after four cycles. The toxicity of TC degradation intermediates was evaluated using T.E.S.T and ECOSAR.