Simple fabrication of carboxymethyl cellulose and κ-carrageenan composite aerogel with efficient performance in removal of fluoroquinolone antibiotics from water

被引：0

作者：

Li Na ^{[1
,2
]}

Gao Boqiang ^{[1
]}

Yang Ran ^{[1
]}

Yang Hu ^{[1
]}

机构：

[1] State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing , China

[2] Department of Environmental Science, School of Tropical and Laboratory Medicine, Hainan Medical University, Haikou ,

来源：

Frontiers of Environmental Science & Engineering | 2022年 / 16卷 / 10期

关键词：

Composite aerogel of carboxymethyl cellulose and κ-carrageenan; Fluoroquinolone antibiotics; Adsorption performance; Coexisting substances; Adsorption mechanism; Reusability;

D O I：

暂无

中图分类号：

X703 [废水的处理与利用]; TQ427.26 []; O647.3 [吸附];

学科分类号：

摘要：

● A composite aerogel was simply obtained to remove various fluoroquinolones (FQs).● The structural and textural properties of this composite aerogel are improved.● Its adsorption capacity was improved at a low content of coexisting Cu2+ or Fe3+ ion. ● Two substructural analogs of FQs are compared to explore the adsorption mechanisms.● This aerogel after saturated adsorption can be reused directly for Cu2+ adsorption. 3D composite aerogels (CMC-CG) composed of carboxymethyl cellulose and κ-carrageenan were designed and fabricated using the one-pot synthesis technique. The optimized CMC-CG showed a good mechanical property and a high swelling ratio due to its superior textural properties with a proper chemically cross-linked interpenetrating network structure. CMC-CG was utilized for the removal of various fluoroquinolones (FQs) from water and exhibited high adsorption performance because of effective electrostatic attraction and hydrogen bonding interactions. Ciprofloxacin (CIP), a popular FQ, was used as the representative. The optimized CMC-CG had a theoretically maximal CIP uptake of approximately 1.271 mmol/g at the pH of 5.0. The adsorption capacity of CMC-CG was improved in the presence of some cations, Cu2+ and Fe3+ ions, at a low concentration through the bridging effect but was reduced at a high concentration. The investigation of adsorption mechanisms, based on the adsorption kinetics, isotherms and thermodynamic study, Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy analyses before and after adsorption, and changes in the adsorption performance of CMC-CG toward two molecular probes, further indicated that electrostatic attraction was the dominant interaction rather than hydrogen bonding in this adsorption. CMC-CG after saturated adsorption of CIP could be easily regenerated using a dilute NaCl aqueous solution and reused efficiently. Moreover, the disused aerogel could still be reused as a new adsorbent for effective adsorption of Cu2+ ion. Overall, this study suggested the promising applications of this composite aerogel as an eco-friendly, cost-effective, and recyclable adsorbent for the efficient removal of FQs from water.

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