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Ion exchange and adsorption of cadmium from aqueous media in sodium-modified expanded vermiculite

  • Adsorption (and Catalysis or Photocatalysis) Applied to Environmental Protection
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Abstract

The use of mineral clays as alternative adsorbent has received attention due to their physicochemical characteristics, superficial negative charge, abundance of vermiculite (especially in Brazil), low cost, and chemical composition, which allows the material modification to increase the adsorptive capacity. This manuscript evaluated the use of expanded vermiculite (EV) and sodium-modified vermiculite (VNa) in the adsorption and ion exchange of Cd2+ ions. The sodification was successfully carried out making the ion exchange capacity greater in the modified clay, confirmed by EDX, cation exchange capacity (CEC), DRX, and FTIR analysis. The CEC was 210 and 233 mEq/100 g for the EV and VNa, respectively, with 97.8% exchangeable ion (Na+) in the VNa. FTIR spectra showed small variations in the groups related to ion exchange and XRD analysis indicated changes in the distance of the layers with loss of crystallinity after clay modification, which was recovered after cadmium adsorption. The kinetics became faster with an equilibrium time of 10 min for VNa and 45 min for EV. Cd2+ removal by vermiculite above 99% was achieved. Pseudo-second order model best described the kinetics, in which the resistance to mass transfer in external film is the limiting step of the process and, once this resistance is overcome, the ion exchange happens quickly. Despite the decrease in surface area after sodification, the adsorptive capacity increased 158% in the sodified adsorbent, from 0.107 mmol/g for EV to 0.276 mmol/g for VNa, under the evaluated conditions.

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Funding

The authors received financial support from the Research Supporting Foundation of the State of São Paulo (FAPESP) (Proc. 2017/18236–1 and 2019/11353–8), Brazilian National Research Council (CNPq) (406193/2018–5), Coordination for the Improvement of Higher Education Personnel (CAPES, PROCAD 88887.200617/2018–00 UNICAMP/UFPA/UFAM, Financial Code 001).

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Conceptualization: Melissa Gurgel Adeodato Vieira, Reginaldo Guirardello.

Literature search and data analysis: Henrique Santana de Carvalho Neves.

Writing—original draft preparation: Thiago Lopes da Silva.

Writing—review and editing: Melissa Gurgel Adeodato Vieira, Meuris Gurgel Carlos da Silva, Reginaldo Guirardello.

Supervision: Melissa Gurgel Adeodato Vieira, Reginaldo Guirardello.

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Correspondence to Thiago Lopes da Silva.

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The authors declare no competing interests.

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Responsible Editor: Tito Roberto Cadaval Jr

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HSC Neves and TL Silva equally contributed to this work as first authors

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Neves, H.S.d., da Silva, T.L., da Silva, M.G.C. et al. Ion exchange and adsorption of cadmium from aqueous media in sodium-modified expanded vermiculite. Environ Sci Pollut Res 29, 79903–79919 (2022). https://doi.org/10.1007/s11356-021-16841-8

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  • DOI: https://doi.org/10.1007/s11356-021-16841-8

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