Solvent-less method for efficient photocatalytic [small alpha]-Fe2O3 nanoparticles using macromolecular polymeric precursors

The submission of new items to CORA is currently unavailable due to a repository upgrade. For further information, please contact Thank you for your understanding.

Show simple item record Díaz, Carlos Barrientos, Lorena Carrillo, Daniel Valdebenito, Javier Valenzuela, María Luisa Allende, Patricio Geaney, Hugh O'Dwyer, Colm 2018-05-09T13:27:17Z 2018-05-09T13:27:17Z 2016-06-06
dc.identifier.citation Diaz, C., Barrientos, L., Carrillo, D., Valdebenito, J., Valenzuela, M. L., Allende, P., Geaney, H. and O'Dwyer, C. (2016) 'Solvent-less method for efficient photocatalytic [small alpha]-Fe2O3 nanoparticles using macromolecular polymeric precursors', New Journal of Chemistry, 40(8), pp. 6768-6776. doi: 10.1039/C6NJ00561F en
dc.identifier.volume 40 en
dc.identifier.issued 8 en
dc.identifier.startpage 6768 en
dc.identifier.endpage 6776 en
dc.identifier.issn 1144-0546
dc.identifier.doi 10.1039/C6NJ00561F
dc.description.abstract 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 metal content and the nature of the macromolecular complex (chitosan or PS-co-4-PVP). For both polymers, the 1 : 1 molar ratio precursor produces nanoparticles ranging from 10–200 nm with a moderate superparamagnetic behavior and optical bandgap marginally larger than bulk Fe2O3. A matrix-incubated formation mechanism involving the carbonization of the organic matter, forming voids within the macromolecular complex wherein the Fe centres coalesce, oxidize and crystallize into nanoparticles is also proposed. The hematite Fe2O3 nanoparticle materials demonstrate very efficient photocatalytic degradation of persistent water pollutants such as the cationic dye methylene blue. The nanoparticulate material obtained from chitosan·(FeCl2)y 1 : 1 under the simulated sunlight (full visible spectrum) irradiation provides high rate degradation of MB by 73% in 60 min and >94% after 150 min, measured at 655 nm. en
dc.description.sponsorship Fondo Nacional de Desarrollo Científico y Tecnológico (Fondecyt Projects 1120179, 1160241 and 1131112); Comisión Nacional de Investigación Científica y Tecnológica (Basal Financing Program CONICYT FB0807 (CEDENNA)) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Royal Society of Chemistry (RSC) en
dc.rights © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016 en
dc.subject Diffuse reflectance spectroscopy en
dc.subject Electron spin resonance en
dc.subject Infrared spectrometry en
dc.subject Irradiation en
dc.subject Light en
dc.subject Macromolecule en
dc.subject Photocatalysis en
dc.subject Polymerization en
dc.subject Precursor en
dc.subject Pyrolysis en
dc.subject Sunlight en
dc.subject Water pollutant en
dc.subject Nanoparticle en
dc.title Solvent-less method for efficient photocatalytic [small alpha]-Fe2O3 nanoparticles using macromolecular polymeric precursors en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Colm O'Dwyer, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en 2018-05-03T07:31:05Z
dc.description.version Accepted Version en
dc.internal.rssid 358464224
dc.contributor.funder Fondo Nacional de Desarrollo Científico y Tecnológico en
dc.contributor.funder Comisión Nacional de Investigación Científica y Tecnológica en
dc.description.status Peer reviewed en
dc.identifier.journaltitle New Journal Of Chemistry en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress en

Files in this item

This item appears in the following Collection(s)

Show simple item record

This website uses cookies. By using this website, you consent to the use of cookies in accordance with the UCC Privacy and Cookies Statement. For more information about cookies and how you can disable them, visit our Privacy and Cookies statement