Carbon Xerogel Nanostructures with Integrated Bi and Fe Components for Hydrogen Peroxide and Heavy Metal Detection

Molecules

Monica Baia¹  CarmenI. Fort²  LiviuC. Cotet²  Ileana Florea³  Sandrine Tuseau-Nenez⁴  Lucian Baia⁵  MihaiM. Rusu⁵  Adriana Vulpoi⁶  Mihaela Baibarac⁷ 

[1] Department of Biomolecular Physics, Faculty of Physics, “Babes-Bolyai” University, M. Kogalniceanu 1, RO-400084 Cluj-Napoca, Romania;Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering, “Babes-Bolyai” University, Arany Janos 11, RO-400028 Cluj-Napoca, Romania;LPICM, CNRS, Ecole Polytechnique, IPParis, 91228 Palaiseau, France;Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, IPParis, 91228 Palaiseau, France;Laboratory of Advanced Materials and Applied Technologies, Institute for Research-Development-Innovation in Applied Natural Sciences, “Babes-Bolyai” University, Fântânele 30, RO-400294 Cluj-Napoca, Romania;Nanostructured Materials and Bio-Nano-Interfaces Center, Institute of Interdisciplinary Research in Bio-Nano-Sciences, “Babes-Bolyai” University, T. Laurean 42, RO-400271 Cluj-Napoca, Romania;National Institute of Materials Physics, Laboratory Optical Processes in Nanostructure Materials, Atomistilor str. 405 A, 77125 Bucharest, Romania;

关键词: carbon nanocomposites;    bismuth;    iron;    hybrid structures;    electrochemical sensors;    lead;   

DOI  :  10.3390/molecules26010117

来源: DOAJ

【 摘 要 】

Multifunctional Bi- and Fe-modified carbon xerogel composites (CXBiFe), with different Fe concentrations, were obtained by a resorcinol–formaldehyde sol–gel method, followed by drying in ambient conditions and pyrolysis treatment. The morphological and structural characterization performed by X-ray diffraction (XRD), Raman spectroscopy, N₂ adsorption/desorption porosimetry, scanning electron microscopy (SEM) and scanning/transmission electron microscopy (STEM) analyses, indicates the formation of carbon-based nanocomposites with integrated Bi and Fe oxide nanoparticles. At higher Fe concentrations, Bi-Fe-O interactions lead to the formation of hybrid nanostructures and off-stoichiometric Bi₂Fe₄O₉ mullite-like structures together with an excess of iron oxide nanoparticles. To examine the effect of the Fe content on the electrochemical performance of the CXBiFe composites, the obtained powders were initially dispersed in a chitosan solution and applied on the surface of glassy carbon electrodes. Then, the multifunctional character of the CXBiFe systems is assessed by involving the obtained modified electrodes for the detection of different analytes, such as biomarkers (hydrogen peroxide) and heavy metal ions (i.e., Pb²⁺). The achieved results indicate a drop in the detection limit for H₂O₂ as Fe content increases. Even though the current results suggest that the surface modifications of the Bi phase with Fe and O impurities lower Pb²⁺ detection efficiencies, Pb²⁺ sensing well below the admitted concentrations for drinkable water is also noticed.

【 授权许可】

Unknown