Artículos de revistas
Solvent-less method for efficient photocatalytic α-Fe2O3 nanoparticles using macromolecular polymeric precursors
Fecha
2016Registro en:
New Journal of Chemistry, Volumen 40, Issue 8, 2018, Pages 6768-6776
13699261
11440546
10.1039/c6nj00561f
Autor
Diaz, Carlos
Barrientos, Lorena
Carrillo, Daniel
Valdebenito, Javier
Valenzuela, Maria L.
Allende, Patricio
Geaney, Hugh
O'Dwyer, Colm
Institución
Resumen
© 2016 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. We report a method for solvent-less growth of single crystalline hematite Fe2O3 nanoparticles from metal-containing polymeric macromolecular complexes, and demonstrate their efficient photocatalytic degradation of persistent cationic dye pollutants under visible light. Macromolecular complexes such as chitosan·(FeCl2)y, chitosan·(FeCl3)y, PS-co-4-PVP·(FeCl2)y and PS-co-4-PVP·(FeCl3)y with controlled polymer:metal molar ratios of 1:1 and 5:1 were prepared by single reaction of the respective polymers and iron chloride salts in CH2Cl2. The stable insoluble compounds were characterized by elemental analysis, infra-red spectroscopy, EPR and diffuse reflectance spectroscopy, and confirm Fe salts with degrees of coordination of ∼60-70%. Pyrolysis of these macromolecular precursors under air and at 800 °C forms networked Fe2O3 nanoparticles, whose volumetric density, size and shape is controlled by the