Removal of Three Fluoroquinolone Antibiotics by NaClO₂-modified Biosorbent from Fruit Fiber of C. Procera

ABSTRACT

Here, Calotropis gigantea fiber (CGF) was first treated using NaClO₂ to chemically modify the fiber surface to improve its hydrophilicity. Subsequently, the resulting NaClO₂-CGF was used as the biosorbent to remove three fluoroquinolone antibiotics including enrofloxacin (Enr), ciprofloxacin (Cip), and norfloxacin (Nor). The results demonstrate that NaClO₂-CGF shows optimum adsorption properties at pH = 6, with the maximum adsorption capacity of 50–70 mg/g. Further, NaClO₂-CGF can achieve its adsorption equilibrium within 30 min, an indication of its fast adsorption kinetics. After five adsorption-desorption cycles, a higher adsorption percentage is still observed, suggesting its good regeneration for use in successive cycles.

摘要

本文首先以亚氯酸钠（NaClO₂）对牛角瓜纤维（CGF）进行化学改性以提高其表面的亲水性。随后，以NaClO₂-CGF作为生物吸附剂，去除三种氟喹诺酮类抗生素：恩诺沙星（Enr）、环丙沙星（Cip）和诺氟沙星（Nor）。结果表明，NaClO₂-CGF在pH=6时吸附性能最优，最大吸附量为50-70 mg/g，且在30分钟内达到吸附平衡，表明其具有快速的吸附动力学。经过5次吸附-解吸循环后，NaClO₂-CGF对抗生素仍然有较高的吸附率，表明发展的吸附剂具有良好的再生能力，能够多次反复使用。

KEYWORDS:

• Calotropis gigantea fiber
• sodium chlorite
• enrofloxacin
• ciprofloxacin
• norfloxacin
• static adsorption

关键词:

• 牛角瓜纤维
• 亚氯酸钠
• 恩诺沙星
• 环丙沙星
• 诺氟沙星
• 静态吸附

Acknowledgments

The authors are grateful for the support from Huimin Hu (Shanghai Magic Tree Biotechnology Co., Ltd., Shanghai, China) for providing the Calotropis gigantea fiber.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (No. 21477135); the Gansu Provincial Natural Science Foundation of China (No. 17JR5RA205) and the Fundamental Research Funds for the Central Universities (No. lzujbky-2017-209).