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Polydimethylsiloxane amino functionalized sponge for adsorption of copper in water

  • Original Paper: Sol–gel and hybrid materials with surface modification for applications
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Abstract

This work describes the preparation and use of a polydimethylsiloxane sponge amino functionalized for the adsorption of copper in water. The sponge was structurally characterized by infrared spectroscopy and solid-state 29Si NMR, which indicated the presence of silsesquioxane units that acted as nodes on the PDMS chains and linked the functional groups to the network. Thermogravimetric analysis of the product showed good thermal stability, with the initial temperature of weight loss at 400 °C. The material displayed a high degree of swelling in polar solvent, presumably due the cavities. The presence of the amino group increases the adsorption of copper onto the surface of the sponge, with adsorption capacity of about 2.0 mmol (127 mg) per gram of material. The sponge shows promising results for environmental remediation with the removal of copper in water, as well as a simple utilization with no need of a separation process after metal adsorption.

Highlights

  • A polydimethylsiloxane sponge functionalized with amino groups was prepared.

  • Through a single step preparation process.

  • Adsorption equilibrium are reached after 72 h immersion in aqueous solution.

  • Copper ions was absorbed efficiently from water solution, on the sponge.

  • High adsorption capacities in aqueous media.

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Acknowledgements

The authors are grateful to FAPEMIG, CNPq and CAPES for the fellowship granted, and for the provision of financial support. We also thank Ana Cristina Honorato Castro and the Multiuser Laboratory of Chemistry Institute at the Universidade Federal de Uberlândia for the use of the scanning electron microscopy facilities.

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  1. Instituto de Química, Universidade Federal de Alfenas, Rua Gabriel Monteiro da Silva, 700, Centro, Alfenas, MG, 37130-001, Brasil

    Luana A. R. Giusto & Fábio L. Pissetti

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Correspondence to Fábio L. Pissetti.

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Giusto, L.A.R., Pissetti, F.L. Polydimethylsiloxane amino functionalized sponge for adsorption of copper in water. J Sol-Gel Sci Technol 99, 243–251 (2021). https://doi.org/10.1007/s10971-021-05538-6

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