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Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications

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Abstract

In this work, mesoporous silica mobil composition of matter no. 41 (MCM-41) was synthesized by the sol-gel method. Two different surface modifications were made to transform this material into a very active adsorbent and catalyst support: (i) impregnation of iron nanoparticles and (ii) hydrophobization via chemical vapor deposition (CVD) with ethanol. The materials prepared with different iron contents, i.e., 2.5, 5, and 10 %, after hydrophobization, were characterized by several techniques. CHN analysis and Raman spectroscopy proved that approximately 15 % of carbon is deposited during CVD process mainly as organized carbonaceous structures. The specific surface area was determined by the BET method as up to 1080 m2 g−1, which explains the excellent results of the materials in the adsorption of model dyes methylene blue and indigo carmine. Mössbauer spectroscopy, thermogravimetric (TG)/DTG analysis, and transmission electron microscopy (TEM) images showed that the iron supported may be partially reduced during the CVD process to Fe2+ species, which are stabilized by the carbon coating. This iron species plays an important role in the oxidation of different contaminants, such as quinoline and methylene blue. The results obtained in the catalytic tests showed to be very promising.

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Acknowledgments

The authors would like to acknowledge CAPES, CNPq, and FAPEMIG for financial support and the Center of Microscopy at the Universidade Federal de Minas Gerais (http://www.microscopia.ufmg.br) for providing the equipment and technical support for experiments involving electron microscopy.

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Authors and Affiliations

  1. Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, Brazil, CEP 31270-901

    Amanda R. Martins, Adriana B. Salviano, Aline A. S. Oliveira & Flávia C. C. Moura

  2. Centro Federal de Educação Tecnológica de Minas Gerais, Av. Amazonas 5253, Nova Suíça, Belo Horizonte, MG, CEP 30421-169, Brazil

    Raquel V. Mambrini

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  1. Amanda R. Martins
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  2. Adriana B. Salviano
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  3. Aline A. S. Oliveira
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  4. Raquel V. Mambrini
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  5. Flávia C. C. Moura
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Correspondence to Flávia C. C. Moura.

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Responsible editor: Santiago V. Luis

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Martins, A.R., Salviano, A.B., Oliveira, A.A.S. et al. Synthesis and characterization of catalysts based on mesoporous silica partially hydrophobized for technological applications. Environ Sci Pollut Res 24, 5991–6001 (2017). https://doi.org/10.1007/s11356-016-6692-3

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  • DOI: https://doi.org/10.1007/s11356-016-6692-3

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