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Selective adsorption of tetracycline and copper(II) on ion-imprinted porous alginate microspheres: performance and potential mechanisms

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Abstract 

A novel epichlorohydrin and thiourea grafted porous alginate adsorbent (UA-Ca/IIP) was synthesized using ion-imprinting and direct templating to remove copper ions (Cu(II)) and tetracycline (TC) in aqueous solution. UA-Ca/IIP demonstrated great selectivity for Cu(II) and TC among different coexisting anions (CO32−, PO43− and SO42−), cations (Ca2+, Mg2+ and NH4+), and antibiotics (oxytetracycline and sulfamethoxazole). The adsorption of TC and Cu(II) by UA-Ca/IIP was significantly affected by the pH of the solution, and the quantity of TC and Cu(II) adsorbed reached a maximum at pH 5. A pseudo-second-order model better fitted the kinetic data; the Langmuir model predicted the maximum adsorption quantities 3.527 mmol TC g−1 and 4.478 mmol Cu(II) g−1 at 298 K. Thermodynamic studies indicated that the TC and Cu(II) adsorption was more rapid at a higher temperature. Antagonistic and synergistic adsorption experiments showed that the adsorption capacity of TC would increase significantly with the increase of Cu(II) concentration. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy indicated that along with the influence of pH, electrostatic interaction and complexation were the main mechanisms of TC and Cu(II) adsorption. Regeneration experiments revealed that TC and Cu(II) were removed efficiently and that UA-Ca/IIP was recyclable over the long term. These results show that the modified porous alginate microsphere is a green and recyclable adsorbent, which has good selectivity and high adsorption performance for the removal of TC and Cu(II).

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Acknowledgements

The authors thank the anonymous reviewers, as well as the editor for their editorial comments and suggestions, which improved the manuscript considerably.

Funding

The authors received financial support from the Natural Science Foundation of Anhui Province of China (2208085ME154), the Open Project of Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education (BWPU2021KF08), the open fund of State Key Laboratory of Pollution Control and Resource Reuse (PCRRF210010), and the key projects of Anhui Provincial Department of Education of China (KJ2020A0266).

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Wenkai Wu: methodology, investigation, formal analysis, writing — original draft; Xiangpeng Gao: data curation, writing — original draft. Bo Chen and Guanhua Meng: writing — review and editing. Feng Xue: validation, visualization, writing — review and editing. Qiaoping Kong and Jianhua Yang: resources, methodology. Jianjun Lian: conceptualization, writing — original draft, writing — review and editing, project administration, supervision.

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Correspondence to Jianjun Lian.

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Wu, W., Gao, X., Chen, B. et al. Selective adsorption of tetracycline and copper(II) on ion-imprinted porous alginate microspheres: performance and potential mechanisms. Environ Sci Pollut Res 30, 105538–105555 (2023). https://doi.org/10.1007/s11356-023-29810-0

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  • DOI: https://doi.org/10.1007/s11356-023-29810-0

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