Abstract
A new milling procedure for a cost-effective production of nanoscale zero-valent iron for environmental remediation is presented. Conventional ball milling of iron in an organic solvent as Mono Ethylene Glycol produces flattened iron particles that are unlikely to break even after very long milling times. With the aim of breaking down these iron flakes, in this new procedure, further milling is carried out by adding an amount of fine alumina powder to the previously milled solution. As the amount of added alumina increases from 9 to 54 g l−1, a progressive decrease of the presence of flakes is observed. In the latter case, the appearance of the particles formed by fragments of former flakes is rather homogeneous, with most of the final nanoparticles having an equivalent diameter well below 1 µm and with an average particle size in solution of around 400 nm. An additional increase of alumina content results in a highly viscous solution showing worse particle size distribution. Milled particles, in the case of alumina concentrations of 54 g l−1, have a fairly large specific surface area and high Fe(0) content. These new particles show a very good Cr(VI) removal efficiency compared with other commercial products available. This good reactivity is related to the absence of an oxide layer, the large amount of superficial irregularities generated by the repetitive fracture process during milling and the presence of a fine nanostructure within the iron nanoparticles.
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Acknowledgments
This work was supported by the EU-Project NANOREM (Taking Nanotechnological Remediation Processes from Lab Scale to End User Applications for the Restoration of a Clean Environment, NMP.2012.1.2-1 FP7—Grant Agreement Nr. 309517).
David Ribas is also grateful to the Spanish MEC under the FPI project for the grant awarded to him (ref. BES-2012-052327) and Miroslav Cernik for the support through the “National Programme for Sustainability I” project LO1201 and the OPR&DI project of the Centre for Nanomaterials, Advanced Technologies and Innovation CZ.1.05/2.1.00/01.0005.
The authors would like to thank PometonEspaña and BASF GmbH for their donation of materials to carry out the project.
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Ribas, D., Cernik, M., Martí, V. et al. Improvements in nanoscale zero-valent iron production by milling through the addition of alumina. J Nanopart Res 18, 181 (2016). https://doi.org/10.1007/s11051-016-3490-2
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DOI: https://doi.org/10.1007/s11051-016-3490-2