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Fabrication of Polyethyleneimine-Functionalized Chitosan Composite Microspheres for Efficient Removal of Diclofenac Sodium from Water: Behavior and Mechanism Study

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Abstract

Ecotoxicity of diclofenac sodium (DS) even at low concentrations makes it urgent to remove DS from water. In this work, chitosan microspheres were prepared by one-step reversed-phase emulsion method, and then, polyethyleneimine (PEI) was successfully grafted to form CS/PEI composites. The CS/PEI was characterized by Fourier infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Effects of different influencing factors like material composition, dosage, pH, co-existing anions, and humic acid were investigated, and adsorption behavior of CS/PEI was explored by model simulation analysis. Results showed that adsorption process fits well with pseudo-second-order kinetic model and Langmuir adsorption isotherm model, indicating homogeneous and monolayer adsorption nature, and maximum Langmuir adsorption capacity was 364.12 mg/g at pH 6. The reusability of CS/PEI was confirmed by cyclic adsorption-desorption experiments, and electrostatic attraction and hydrogen bonding were the main mechanism for DS uptake by CS/PEI. Therefore, CS/PEI microspheres can be regarded as an efficient and convenient adsorbent for DS removal from aqueous media.

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Funding

This work was financially supported by Open Project Funding of Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Hubei University of Technology (No. HGKFZ03).

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Authors and Affiliations

  1. School of Civil Engineering, Wuhan University, Wuhan, 430072, China

    Hongyu Wang, Yi **e, Bin Wang, Can Jiang, **aoling Hu & Dao Zhou

  2. Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Hubei University of Technology, Wuhan, 430068, China

    Henglin **ao

  3. Central and Southern China Municipal Engineering Design and Research Institute Co., Ltd, Wuhan, 430010, China

    Lu Li & Shujia Zhang

  4. The First People’s Hospital of Jiangxia District, Wuhan, 430200, China

    Dongyun Nan

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  1. Hongyu Wang
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Conceptualization: Hongyu Wang and Henglin **ao; funding acquisition and resources: Hongyu Wang; data curation, formal analysis, and writing—original draft: Yi **e; methodology: Yi **e, Bin Wang, and **aoling Hu; supervision: Lu Li and Shujia Zhang; visualization: Shujia Zhang, Dao Zhou, and Can Jiang; writing—review and editing: Hongyu Wang and Dongyun Nan. All authors discussed the results and commented on the manuscript.

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Wang, H., **e, Y., **ao, H. et al. Fabrication of Polyethyleneimine-Functionalized Chitosan Composite Microspheres for Efficient Removal of Diclofenac Sodium from Water: Behavior and Mechanism Study. Water Air Soil Pollut 235, 242 (2024). https://doi.org/10.1007/s11270-024-07063-y

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