Degradation of tetracycline in water by biochar supported nanosized iron activated persulfate. (December 2020)

• Record Type: Journal Article
• Authors: Shao, Fengli; Wang, Yingjie; Mao, Yingrong; Shao, Ting; Shang, Jingge
• Is Part Of: Chemosphere. Volume 261(2020)
• Publication Date: 2020-12
• Subjects: Persulfate -- nFe(0)/BC -- Activation -- Tetracycline -- Degradation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.127844
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Biochar supported nanosized iron (nFe(0)/BC) was synthesized and used as a persulfate (PS) activator to degradation tetracycline (TC). The influence of the initial pH values, PS and nFe(0)/BC dosage, initial TC concentration, and coexist anions were investigated. In the nFe(0)/BC–PS system, TC could be effectively removed at various pH values (3.0–9.0). The degradation efficiency of TC (100 mg/L) was 97.68% using nFe(0)/BC (0.4 g/L) and persulfate (1 mM) at pH 5.0. Coexisting ions (HCO3 − and NO3 − ) had an inhibitory effect on TC degradation. The removal of TC could be fitted by a pseudo-second-order model. Electron-Spin Resonance (ESR) analysis and scavenging tests suggested that sulfate radicals (SO4 · − ) and hydroxyl radicals (HO·) were responsible for TC degradation. Details of the advanced oxidation process (AOP)-induced degradation pathways of TC were determined based on liquid chromatography mass-spectrometry (LC–MS) analysis. The nFe(0)/BC could still maintain 86.38% of its original removal capacity after five cycles. The findings of this study proved that nFe(0)/BC can be applied to activate PS for the treatment of pollution caused by TC. Graphical abstract: Image 1 Highlights: nFe(0)/BC was used to activate persulfate to degrade tetracycline. SO4 · - and HO· were the major radical and were responsible for TC degradation. The nFe(0)/BC composite demonstrated good stability and reusability.