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Mesoporous polysilsesquioxane adsorbents with secondary amine groups for ions of metals, rare earth elements, and reactive dye removal

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Abstract

Silica nanoparticles with secondary amine groups were synthesized through silanes hydrolysis with ammonia (sol–gel method). SEM analysis showed that the resulting samples were composed of densely packed spherical particles 40–100 nm in size. IR spectra analysis confirmed the incorporation of amine functional groups (2.7–3.2 mmol/g according to elemental analysis) during synthesis, as well as the existence of silanol groups. All samples exhibited high specific surface area values up to 759 m2/g. Metal ion adsorption studies demonstrated no direct correlation between group content and sorption capacity, irrespective of the metal type. However, the amine-containing samples exhibited higher affinity for Cu(II) ions adsorption and good sorption characteristics for Ni(II), Nd(III), and Dy(III) ions. The sorption capacity was found to depend on the ratio of amino and silanol groups on the surface, the complex formed with the metal, and the ion's ability to interact with these groups of different natures. Additionally, the samples displayed high affinity for RB19 anionic dye extraction.

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Funding

This research is funded by project APVV-19-0302 and the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. 09I03-03-V01-00098.

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Conceptualization, VT, NS and IM; methodology, VT and NS; formal analysis, VT, NS, OS and DMB; investigation, VT, NS, OS and IM; resources, IM; data curation, VT, NS, OS and IM; writing—original draft preparation, NS and OS; writing—review and editing, VT, IM; supervision, IM; project administration, IM. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Inna Melnyk.

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Melnyk, I., Tomina, V., Stolyarchuk, N. et al. Mesoporous polysilsesquioxane adsorbents with secondary amine groups for ions of metals, rare earth elements, and reactive dye removal. Appl Nanosci 13, 7349–7363 (2023). https://doi.org/10.1007/s13204-023-02919-x

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  • DOI: https://doi.org/10.1007/s13204-023-02919-x

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