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Abstract:
Antibiotics pose significant risks to both the environment and human health. Herein, we develop a collaborative strategy for the enhanced removal of a typical antibiotic, Ciprofloxacin (CIP), by using a bamboo leaf -derived biochar/iron silicate composite (BL-FeSi) with the assistance of peroxymonosulfate (PMS). The rationale behind the design is the construction of composited material with synergistic adsorption -catalysis functions, based on covalent bonding networks of the biochar and specific Fe(III)/Fe(II) redox chemistry of iron silicate in PMS activation system. H 2 reduction of pristine BL-FeSi increases Fe(II) content and thus improves catalytic activity. Batch experiments demonstrate that the preferred BL-FeSi 400 (H 2 treatment at 400 degrees C) exhibits superior efficiency in activating PMS. The CIP removal efficiency is highly dependent on pH value of reaction solution. A remarkable 97% removal is achieved at pH = 5.5 (CIP: 60 mL, 20 mg/L; BL-FeSi 400 : 0.2 g/L, PMS: 0.2 g/L), and the pH increase to 11 results in 100% CIP removal. The BL-FeSi 400 shows robust resistance to inorganic ions (NO 3 - , SO 4 (2 -) , HCO 3 - , and H- 2 PO 4 (-) ), and the catalytic activity remains consistently high ( >82%) even after four consecutive cycles, making it highly promising for practical applications. It is found that both radical pathway (center dot OH and SO 4 center dot - ) and non - radical pathway ( O-1 ( 2) ) contribute to CIP degradation in the BL-FeSi 400 /PMS system, while the active center dot OH dominates the oxidization process. The coupling of adsorption and degradation holds great potentials for effective removal of more organic contaminants.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
ISSN: 0957-5820
Year: 2024
Volume: 186
Page: 1183-1196
7 . 8 0 0
JCR@2022
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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