Abstract
Magnetic particles with active groups on their surfaces can be applied to wastewater purification to remove harmful ions, but the insufficient number of active groups on their surfaces tends to limit their removal rate of ions. Herein, we grafted different generations of dendritic macromolecular polyamidoamine (PAMAM) onto the magnetic chitosan microspheres (MCS) using ethylenediamine tetraacetic acid (EDTA) as core (MCEPs) for the removal of Cu (II). Firstly, 7 μm-sized MCS with good dispersibility was prepared by adjusting conditions such as glacial acetic acid content, emulsifier content and raw material ratio. Secondly, the effect of MCEPs generation, pH and contact time on the adsorption capacity were investigated. The adsorption experiments showed that the MCEPs had a high adsorption capacity, when the adsorbent was the second generation of MCEP (MCEP G2.0), the maximum adsorption capacity can up to 702.9 mg/g and the adsorption process can be completed in 60 min. Moreover, among various isotherms models, MCEP G2.0 was well-fitted by Langmuir adsorption isotherm. Also, adsorption kinetic studies proved that the adsorption mechanism of MCEP G2.0 adsorbent followed the pseudo-second-order kinetic model, demonstrating that the process was chemisorption. The adsorbent has renewability as well, after five adsorption cycles, its adsorption efficiency was still higher than 80%. Therefore, the adsorbent showed a superior adsorption capacity and renewability to remove Cu (II).
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References
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Acknowledgements
This work was financially supported by Jilin Scientific and Technological Development Program (No. 20220201108GX and No. 20210201067GX).
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Funding was provided by Jilin Scientific and Technological Development Program (Grant no. 20220201108GX).
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RW: Conceptualization, Methodology, Investigation, Data curation, Formal analysis, Writing— original draft. XS: Methodology, Investigation. LL: Supervision, Validation, Funding acquisition. CZ: Supervision, Project administration. GW: Writing—review & editing, Supervision, Funding acquisition, Resources.
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Wang, R., Song, X., Liu, L. et al. PAMAM Grafted Magnetic Chitosan Particles by EDTA Core for Efficient Removal of Cu (II). J Polym Environ (2024). https://doi.org/10.1007/s10924-023-03164-7
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DOI: https://doi.org/10.1007/s10924-023-03164-7