Efficient adsorptive removal of fluoroquinolone antibiotics from water by alkali and bimetallic salts co-hydrothermally modified sludge biochar. (1st April 2022)

• Record Type: Journal Article
• Authors: Ma, Yongfei; Lu, Tingmei; Yang, Lie; Wu, Li; Li, Ping; Tang, Jiayi; Chen, Yulin; Gao, Feng; Cui, Song; Qi, Xuebin; Zhang, Zulin
• Is Part Of: Environmental pollution. Volume 298(2022)
• Publication Date: 2022-04-01
• Subjects: Fluoroquinolones -- Sludge biochar -- Potassium hydroxide -- Bimetallic salts -- Hydrothermal activation; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2022.118833
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Fluoroquinolones are one of most commonly used antibiotics for preventing and treating bacterial infections and their unsatisfactory removal by conventional wastewater treatment technology have aroused widespread attention. A novel adsorbent of KMSBC was the first time synthesized and tested to adsorb three typical fluoroquinolone antibiotics of CIP, NOR and OFL from water. The characterization analysis showed that KMSBC possessed the superior porous structure, abundant functional groups and greater graphitic degree. Together with kinetics, isotherms, thermodynamics and critical factors (e.g., biochar dose, reaction time/temperature, fluoroquinolone antibiotics concentration, pH, co-existing ionic strength and HA concentration) analysis suggested that pore filling, π-π conjugation, H-bonding and electrostatic interaction were the key mechanisms for fluoroquinolone antibiotics adsorption by KMSBC. KMSBC exhibited the optimum adsorption performance at pH = 5 despite the adsorbates. The maximum adsorption capacity of KMSBC for CIP, NOR and OFL were 49.9, 55.7 and 47.4 mg/g at 25 °C, respectively. Also, KMSBC exhibited the good magnetic sensitivity and stability with the leaching concentrations of Fe were far below than environmental limit (GB5749-2006) at various pH (from 3 to 12), ionic strength and HA concentrations. Additionally, KMSBC performed a stable sustainable adsorption performance in recycles by NaOH regeneration. Thus, KMSBC had the potential to be a promising adsorbent for fluoroquinolone antibiotics removal with favorable adsorption capacity, environmental security and easy regeneration performance. Graphical abstract: Image 1 Highlights: KOH, MgCl2 and FeCl3 were the first time used to co-hydrothermally activated SBC. KMSBC performed superior adsorption capacity for typical FQs of CIP, NOR and OFL. KMSBC exhibited environmental safety at various pH, ions and HA concentrations. The used KMSBC showed a stable sustainable adsorption capacity by NaOH regeneration.