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Amino-modified hollow alumina spheres: effective adsorbent for Cd2+, Pb2+, As(V), and diclofenac removal

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Abstract

A simple sol-gel method and external gelatinization method of hollow alumina spheres synthesis were developed in this study. The spheres were modified with polyethyleneimine (PEI) producing PEI-Al2O3 via (3-glycidyloxypropyl)trimethoxy-silane, GLYMO, linker. Characterization results, obtained using XRD and SEM microscopy revealed spherical geometry with a hollow core of PEI-Al2O3 adsorbent. Introduction of a large number of the amino group, 6.9 mmol g−1, contributes to achieving high adsorption capacities, qm, of 95.6, 124.9, 61.3, and 125.9 mg g−1 for Cd2+, Pb2+, As(V), and DCF, respectively, which is obtained by using the Langmuir model. Thermodynamic studies indicated feasible adsorption and higher spontaneity with temperature increase. The kinetic study conveniently modeled using pseudo-second-order (PSO) and Weber-Morris kinetic model, as well as single resistance mass transfer model, indicated a change of the contribution of diffusional processes during adsorption with a dominance of intra-particle diffusion. The fixed-bed column adsorption data, fitted using Bohart-Adams, Clark, Yoon-Nelson, and Thomas models, showed lower capacity in comparison to batch study, and thus clear potential applicability of PEI-Al2O3 was deduced even at a high loading of feed water.

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Funding

This work was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Contract No. 451-03-68/2020-14/200135).

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Conceptualization: Aleksandar Marinković. Methodology: Vesna Nikolić and Miroslav Sokić. Formal analysis and investigation: Vesna Nikolić, Nataša Tomić, and Zlate Veličković. Writing—original draft preparation: Vesna Nikolić. Writing—review and editing: Mladen Bugarčić, Nataša Tomić, and Aleksandar Marinković. Resources: Aleksandar Marinković. Supervision: Aleksandar Marinković and Željko Kamberović.

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Correspondence to Vesna Nikolić.

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Responsible Editor: Tito Roberto Cadaval Jr

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Nikolić, V., Tomić, N., Bugarčić, M. et al. Amino-modified hollow alumina spheres: effective adsorbent for Cd2+, Pb2+, As(V), and diclofenac removal. Environ Sci Pollut Res 28, 27174–27192 (2021). https://doi.org/10.1007/s11356-020-12157-1

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  • DOI: https://doi.org/10.1007/s11356-020-12157-1

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