Green synthesis of polypyrrole-supported metal catalysts: application to nitrate removal in water

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Title: Green synthesis of polypyrrole-supported metal catalysts: application to nitrate removal in water
Authors: García Fernández, María Jesús | Buitrago Sierra, Robison | Pastor-Blas, M. Mercedes | Soares, O.S.G.P. | Pereira, M.F.R. | Sepúlveda-Escribano, Antonio
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Green synthesis | Polypyrrole-supported | Metal catalysts | Nitrate removal | Water
Knowledge Area: Química Inorgánica
Issue Date: 1-Apr-2015
Publisher: Royal Society of Chemistry
Citation: RSC Advances. 2015, 5: 32706-32713. doi:10.1039/C5RA03441H
Abstract: Pt and Pt/Sn catalysts supported on polypyrrole (PPy) have been prepared using Ar plasma to reduce the metal precursors dispersed on the polymer. The PPy support was synthesized by chemical polymerization of pyrrole with FeCl3·6H2O, this leading to the conducting form of the polymer (conductimetric measurements). The Ar plasma treatment produced a partial reduction of platinum ions, anchored as platinum chloro-complexes to the PPy chain, into metallic platinum. A homogeneous distribution of Pt and Sn nanoparticles was observed by TEM. Activity of the PPy-supported catalysts was evaluated in the reduction of aqueous nitrate with H2 at room temperature. Nitrate concentration in water below the maximum acceptable level of 50 mg L−1 was achieved with all catalysts. However, considering not only efficiency in nitrate reduction, but also minimized concentrations of undesired nitrite and ammonium, the monometallic Pt catalyst seems to be the most promising one.
Sponsor: Financial support from Generalitat Valenciana, Spain (PROMETEO/2009/002 – FEDER and PROMETEOII/2014/004) is gratefully acknowledged. Support by PEst-C/EQB/LA0020/2013, financed by FEDER through COMPETE – Programa Operacional Factores de Competitividade, and by FCT – Fundação para a Ciência e a Tecnologia; NORTE-07-0162-FEDER-000050, financed by QREN, ON2 and FEDER is acknowledged by LCM group. O. S. G. P. Soares acknowledges the grant received from FCT (SFRH/BPD/97689/2013).
ISSN: 2046-2069
DOI: 10.1039/C5RA03441H
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Royal Society of Chemistry 2015
Peer Review: si
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