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Eco-friendly synthesis of nanostructured mesoporous materials from natural source rice husk silica for environmental applications

  • Advanced Oxidation/Reduction Technologies: An Perspective from Iberoamerican Countries
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Abstract

Nanostructured mesoporous materials of MCM-41 type were synthesized using a natural, non-toxic, and cheap source of silica from rice husk. Then, this pure silica was modified with several Fe loadings by a wet impregnation method. The chemical and physic properties of MCM-41 solids obtained were similar to those of MCM-41 synthesized from commercial silica by conventional method. Thus, all catalysts exhibited good structural regularity preserving the mesoporosity after the metal incorporation. The performance of the Fe/MCM-RHA composites as photo-Fenton heterogeneous catalysts was evaluated for photocatalytic degradation of different endocrine-disrupting chemicals (EDCs), such as herbicides (atrazine), and compounds derived from the plastic industry (bisphenol A) and the pharmaceutical industry (acetaminophen). The major photo-catalytic efficiency obtained (Fe/MCM-RHA(2.5)) is consistent with the highest presence of iron species, which are finely dispersed and stabilized on the silica structure, the isolated Fe3+ ions being the accessible and active sites for the reaction. Finally, a cheaper solid arising from the valorization of residual biomass and with excellent photocatalytic performance for the degradation of EDCs (above 99%, 75%, and 60% for BPA, ATZ, and ACE respectively, in a reaction time of 240 min) was obtained.

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All data generated or analyzed during this study are included in this published article (and its supplementary information files).

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Funding

This research was supported by Universidad Tecnológica Nacional (IPUTNCO0005188, MSUTNCO0005243, MSUTNCO0005243) and Consejo Nacional de Investigaciones Científicas (CONICET).

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Contributions

All authors contributed to studying, designing, and planning. Preparation and characterization of samples, and catalytic evaluation of materials were performed by P.M. Carraro and T.B. Benzaquén. The analyses of the results and the draft of the manuscript were written by P.M. Carraro and T.B. Benzaquén. G.A. Eimer supervised the project, aided in interpreting the results, and revised the manuscript. All the authors were responsible to funding acquisition. All authors discussed the results, and read and approved the final manuscript.

Corresponding authors

Correspondence to Tamara B. Benzaquén or Griselda A. Eimer.

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Responsible Editor: Santiago V. Luis

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Carraro, P.M., Benzaquén, T.B. & Eimer, G.A. Eco-friendly synthesis of nanostructured mesoporous materials from natural source rice husk silica for environmental applications. Environ Sci Pollut Res 28, 23707–23719 (2021). https://doi.org/10.1007/s11356-020-11043-0

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  • DOI: https://doi.org/10.1007/s11356-020-11043-0

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