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Use of Rh (III)-Heteropolymolybdate as Potential Catalysts for the Removal of Nitrates in Human Drinking Water: Synthesis, Characterisation and Catalytic Performance

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Abstract

The investigation and development of technologies to remediate water contaminated with NO3− are constantly increasing. An economically and potentially effective alternative is based on the catalytic hydrogenation of NO3− to N2. With this objective, bimetallic RhMo6 catalysts based on Anderson-type heteropolyanion (RhMo6O24H6)3− were prepared and characteri3ed in order to obtain well-defined bimetallic catalyst. The catalysts were supported on Al2O3 with different textural properties and on silica. The heteropolyanion-support interaction was analysed by temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). The differences obtained in activity and selectivity to the different products can be assigned to the different interaction between the RhMo6 Anderson phase and the supports. The RhMo6/G, (G: γ-Al2O3) system showed the best catalytic performance. This catalyst exhibited the lowest reduction temperature of Rh and Mo in the TPR assay and a Rh/Mo surface ratio similar to that of the original phase, as observed by XPS analysis. These studies allowed us to verify a synergic effect between Rh and Mo, through which Mo reducibility was promoted by the presence of the noble metal. The catalytic activity was favoured by the active sites generated from the Anderson phase. This fact was confirmed by comparing the activity of RhMo6/G with that corresponding to a conventional catalyst prepared through successive impregnation of both Rh (III) and Mo (VI) salts.

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Acknowledgements

We are grateful to Mrs. Graciela Valle, Eng. Edgardo Soto, Lic. Mariela Theiller, Dra. Laura Barbelli and Eng. Hernán Bideberripe for their contribution and technical support.

Funding

This study received financial support from the following institutions: CONICET (PIP 0276 and 0003), ANPCyT (PICT 0409) and UNLP (Subsidio Jóvenes Investigadores, Subsidio de Viajes) and Projects I172, X633 y X700; and CICPBA (Project 832/14).

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Authors and Affiliations

  1. Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. Jorge J. Ronco” (CINDECA), CCT-CONICET La Plata, Universidad Nacional de La Plata and Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), calle 47 N° 257, 1900, La Plata, Argentina

    María A. Jaworski, Guillermo R. Bertolini, Carmen I. Cabello, Guillermo J. Siri & Mónica L. Casella

  2. PIDCAT-Facultad de Ingeniería (UNLP), 47 N° 257, La Plata, Argentina

    María A. Jaworski & Guillermo J. Siri

  3. Miembro CIC, Comisión de Investigaciones Científicas y Técnicas, Provincia de Buenos Aires and Facultad de Ingeniería UNLP, La Plata, Argentina

    Carmen I. Cabello

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  1. María A. Jaworski
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  2. Guillermo R. Bertolini
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  3. Carmen I. Cabello
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  4. Guillermo J. Siri
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  5. Mónica L. Casella
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Correspondence to María A. Jaworski.

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Jaworski, M.A., Bertolini, G.R., Cabello, C.I. et al. Use of Rh (III)-Heteropolymolybdate as Potential Catalysts for the Removal of Nitrates in Human Drinking Water: Synthesis, Characterisation and Catalytic Performance. Water Air Soil Pollut 229, 309 (2018). https://doi.org/10.1007/s11270-018-3962-3

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